janitza UMG 96-S2, Installation Instructions Manual

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www
.janitza.de
Doc no. 2.062.010.0
04/2018
Item no. 33.03.
xxx
You can find more detailed information about the
device configuration and communication starting
in step 11.
NOTE
Alternatively to the fuse and circuit breaker, a
miniature circuit breaker can also be used.
16 17
Technical data
Voltage measurement
Three-phase 4-conductor
systems with nominal
voltages up to
230 V/400 V (+-10%) according
to IEC
Overvoltage category 300 V CAT III
Rated surge voltage 4 kV
Fuse for the voltage
measurement 1 - 10 A
(with IEC/UL approval)
Measuring range L-N
0 1) .. 300 Vrms
(max. overvoltage 400 Vrms)
Measuring range L-L
0 1) .. 425 Vrms
(max. overvoltage 620 Vrms)
Limit value for the
measuring range overflow
U L-N
> 300 Vrms
Resolution 0.01 V
Crest factor
1.9 (related to the measurement
range)
Impedance 3 MΩ/phase
Power consumption Approx. 0.1 VA
Sampling frequency 8 kHz
Frequency of the
basic oscillation
- resolution
45 Hz .. 65 Hz
0.01 Hz
1) The device only determines the measured values if voltage
L1-N is greater than 20 Veff (4-conductor measurement)
or voltage L1-L2 is greater than 34 Veff (3-conductor
measurement) on voltage measurement input V1.
Current measurement
Rated current x/1 and x/5 A
Measuring range 0 .. 6 Arms
Limit value for the measuring
range overflow I
> 7 Aeff
Crest factor (based on the
rated current)
2
Resolution 1 mA (display 0.01 A)
Overvoltage category 300 V CAT II
Rated surge voltage 2 kV
Power consumption approx. 0.2 VA (Ri=5 mΩ)
Overload for 1 s 60 A (sinusoidal)
Sampling frequency 8 kHz
Supply voltage
Nominal range
230 V :
AC 90 V - 265 V (50/60 Hz) or
DC 90 V - 250 V, 300 V CATIII
Operating range +-10% of nominal range
Power consumption
230 V
: max. 1.5 VA / 0.5 W
Internal fuse,
not exchangeable Type T1A / 250 VDC / 277 VAC
according to IEC 60127
Recommended overcur-
rent protection device for
the line protection 230 V : 6-16 A
(Char. B)
(IEC-/UL approval)
General information
Net weight (with attached
connectors)
Approx. 250 g
Packaging weight (including
accessories)
Approx. 500 g
Impact resistance IK07 according to IEC 62262
Transport and storage
The following information applies to devices which are
transported or stored in the original packaging.
Free fall
1 m
Temperature K55 (-25 °C up to +70 °C)
Relative humidity 0 to 90% RH
Ambient conditions during operation
Use the UMG 96-S2 in a weather-protected, stationary application.
Protection class II in accordance with IEC 60536 (VDE 0106, Part 1).
Operating temperature
range
K55 (-10° C .. +55° C)
Relative humidity 0 to 75% RH
Operating altitude 0 .. 2000 m above sea level
Degree of pollution 2
Installation position discretionary
Ventilation
No external ventilation
required
Protection against
foreign bodies and water
- Front
- Rear
- Front side with sealing
IP40 i.a.w. EN60529
IP20 i.a.w. EN60529
IP54 i.a.w. EN60529
Digital outputs
1 digital output, semiconductor relay, not short-circuit proof.
Switching voltage
max. 60 V DC
Switching current max. 50 mAeff DC
Pulse output (energy pulse) Max. 12.5 Hz
Serial interface
RS485 - Modbus RTU/slave
9.6 kbps, 19.2 kbps,
38.4 kbps
Stripping length 7 mm
Terminal connection capacity (supply voltage)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm 2 , AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (digital interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 -16
Terminal pins, core end sheath 0.2 - 1.5 mm
2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (current measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm
2
, AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (serial interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 - 16
Terminal pins, core end sheath 0.2 - 1.5 mm
2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (voltage measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm 2 , AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Procedure in the event of errors
Possible error Cause Remedy
No display
External fuse for the power supply voltage has
tripped.
Replace fuse.
No current display
Measured voltage is not connected. Connect the measured voltage.
Measurement current is not connected. Connect measurement current.
Current displayed is too large
or too small.
Current measurement in the wrong phase. Check connection and correct if necessary.
Current transformer factor is incorrectly programmed. Read out and program the current transformer
transformation ratio at the current transformer.
Current harmonics exceed the current peak value at
the measurement input
Install current transformer with a larger CT ratio.
The current at the measurement input was not
achieved.
Install current transformer with a smaller current
transformer ratio.
Voltage displayed is too large
or too small.
Measurement in the wrong phase. Check connection and correct if necessary.
Voltage transformer incorrectly programmed.
Read out and program the voltage transformer ratio
at the voltage transformer.
Voltage displayed is too
small.
Measurement range exceeded. Install voltage transformers.
The peak voltage value at the measurement input has
been exceeded by harmonic components.
Attention! Ensure the measurement inputs are not
overloaded.
Active power is too large or
too small. *
The programmed voltage transformer transmission
ratio is incorrect
Read the current transformer transmission ratio on
the current transformer and program it in the GridVis
software.
A current path is assigned to the wrong voltage path. Check connection and correct if necessary (GridVis).
The programmed voltage transformer transmission
ratio is incorrect
Read the voltage transformer transmission ratio on
the voltage transformer and program it in the GridVis
software.
Possible error Cause Remedy
Active power reference/deliv-
ery is reversed.
At least one current transformer connection is
reversed.
Check connection and correct if necessary (GridVis).
A current path is assigned to the wrong voltage path.
No connection to the device
RS485: Device address incorrect or incorrect
protocol
Set device address / select protocol
"EE" in the display See “Error messages” in the user manual.
Device still does not work
despite the above measures.
Device defective.
Send the device to the manufacturer for inspection
and testing.
NOTE
More technical data can be found in the device
user manual.
NOTE
Property damage due to overloaded measurement inputs!
Too high current and voltage values overload the measurement inputs.
Observe the limit values specified on the rating plate and in the user manual!
General information
1 2
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
Fax +49 6441 9642-30
E-mail: info@janitza.de
www.janitza.com
Energy Analyser
UMG 96-S2
Installation instructions

Installation

Device settings
German version:
see r
ear side
3 4 2
Safety
Safety instructions
The installation instructions do not include
a complete list of all safety measures necessary
for operating the device.
Special operating conditions may require
additional measures. The installation
instructions contain notes that must be
observed for your personal safety and to
prevent property damage.
Used symbols:
The additional symbol
on the device itself indicates
an electrical danger that can
result in serious injuries or death.
The general warning symbol calls
attention to possible risks of
injury. Observe all the instructions
listed under this symbol in order
to prevent injuries or even death.
Safety instructions are highlighted by a warning
triangle and are presented as follows depending
on the level of risk:
Safety measures
When operating electrical devices, specific parts
of these devices inevitably carry dangerous
voltage. As a result, serious bodily harm or
property damage can occur if they are not
handled correctly:
• Before connecting the device, ground it at
the protective conductor terminal if available.
• Dangerous voltages may be present in all
circuit parts connected to the voltage supply.
• There may still be dangerous voltages present
in the device even after it is disconnected
from the supply voltage (capacitor storage).
• Do not operate operating equipment
with open current transformer circuits.
• Do not exceed the limit values specified
in the user manual and on the rating
plate. This must also be observed during
inspections and commissioning.
• Observe the safety instructions and warning
notices in the documents that accompany
the devices.
Qualified personnel
To prevent personal injuries and property
damage, only qualified personnel with electrical
engineering training may work on the device.
They must also have knowledge
• Of the national accident prevention regulations
• In safety technology standards
• In the installation, commissioning and
operation of the device.
Intended use
The device is
• intended for installation in switching cabinets
and small installation distributors. The device
can be installed in any mounting position
(please observe section 3 “Assembly”).
• not intended for installation in vehicles! Using
the device in mobile equipment is considered
an unusual environmental condition and is
only permissible by special agreement.
• not intended for installation in areas exposed
to harmful oils, acids, gases, vapors, dust
and radiation, etc.
The prerequisites for smooth and safe operation
of the device include proper transport, storage,
setup and assembly, as well as proper operation
and maintenance.
The UMG 96-S2 is a power analyzer that:
• measures and calculates electrical
parameters, such as voltage, current,
frequency, power, work, harmonics
(up to the 15th, odd), etc. in building
installations, on distribution units, circuit
breakers and busbar trunking systems.
• displays measurement results
and transfers them via interfaces.
Brief device description
Install the UMG 96-S2 in the weather-protected
front panel of switching cabinets.
Cut-out size:
92
+0.8
x 92
+0.8
mm
Please ensure the following:
Sufficient ventilation
• Observe the clearance to
adjacent components.
• Can be installed in any
position.
Fig. Installation position
rear view of UMG 96-S2
Assembly Connecting the supply voltage
The supply voltage level for your device is specified
on the rating plate.
After connecting the supply voltage, a display
appears. If no display appears, check whether
the supply voltage is within the rated voltage range.
N
L
User manual:
Disclaimer
It is essential that the information products
for the devices are observed to ensure
safe operation and achieve the specified
performance characteristics and product
features. Janitza electronics GmbH assumes no
liability for personal injuries, property damage
and financial losses resulting from the failure to
observe the information products.
Make sure that your information products are
legible and accessible.
Further documentation can be found on our
web site www.janitza.com under Support >
Downloads.
Copyright notice
© 2018 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing,
distribution and any other kind of use, even
in part, is prohibited.
Subject to technical changes.
• Make sure that the installation instructions
match your device.
• First, make sure you have read and understood
the document accompanying the product.
• Keep the documents accompanying
the product accessible through its service
life and hand them over to the subsequent
owner where applicable.
• Please refer to www.janitza.com for information
concerning device revisions and the associated
adjustments to the documentation accompanying
the product.
Disposal
Please observe the national regulations.
Dispose of individual parts, where necessary,
depending on the properties and existing
country-specific regulations, e.g. as:
• Electronic waste
• Plastic
• Metal
or commission a certified disposal company
with the scrapping.
Relevant laws,
applied standards and directives
Please refer to the Declaration of Conformity
on our web site (www.janitza.com) for the
laws, standards and directives applied by
Janitza electronics GmbH.
NOTE
Points out procedures during which a danger
of injuries or property damage does
not
exist.
ATTENTION
Indicates an imminently dangerous situation that
can result in property damage or environmental
damage in the event of noncompliance.
CAUTION
Indicates a potentially dangerous situation
that can result in minor injuries or property
damage.
WARNING
Indicates a potentially dangerous situation
that can result in serious injuries or death.
DANGER
Indicates an imminent danger that will result
in serious and/or fatal injuries.
ATTENTION
Noncompliance with the assembly instructions
can damage or destroy your device.
Ensure sufficient air circulation in your installation
environment and, where applicable, sufficient
cooling with high ambient temperatures.
NOTE
You can find more detailed information about
the device functions, data and assembly
in the user manual.
WARNING
Risk of injury due to defective devices.
Devices, which may have possibly been
damaged due to an improper use, can
no longer fulfill the safety regulations and
represent a risk of injury.
Shut down the device immediately
and secure it against inadvertent
commissioning if the device:
• has visible damage,
• no longer functions despite an intact
power supply,
• was exposed to a prolonged period
of unfavorable conditions
or transport stresses. DANGER
Risk of injury due to electric voltage!
It may result in serious bodily harm or death due to:
• Touching live exposed or stripped cores.
• Device inputs that are dangerous to touch.
Before starting work, disconnect your system
from the power supply. Verify that there
is no current.
ATTENTION
Noncompliance of the connection conditions
or exceeding the permissible voltage range
can damage or destroy your device.
Before you connect the device to the supply
voltage, please observe the following:
• The voltage and frequency must comply
with the specifications on the rating
plate. Observe the limit values as
described in the user manual.
• In building installations, secure
the supply voltage with a UL/IEC-listed
circuit breaker/fuse.
•
The circuit breaker
-
must be easily accessible
for the user and located in the vicinity
of the device.
- must be labeled for the respective
device.
• Do not tap the supply voltage at
the voltage transformers.
• Provide a fuse for the neutral conductor
if the neutral conductor connection
is not grounded to the source.
Fuse
Fig. supply voltage connection.
Circuit breaker
Fig. supply voltage connection.
8 5 6
The device
• is only approved for a current measurement
using the current transformer.
• is designed for the connection of current
transformers with secondary currents
of ../1 A and ../5 A.
• has the current transformer ratio set to 5/5 A
by default.
7
Voltage measurement
The device has 3 voltage inputs and is suitable
for different connection versions.
10 9
Network systems
Suitable network systems and maximum nominal voltages (DIN EN 61010-1/A1):
Circuit breaker
Fuse (UL/IEC-listed)
L2
L3
N
L1
“Direct voltage measurement in a three-phase
4-conductor system” connection version
Voltage measurement connection versions
Load
Current measurement I1, I2, I3 Current measurement connection versions I1, I2, I3
The voltage measurement inputs are designed
for measurements in the low-voltage networks
in which nominal voltages occur up to
• 230 V phase to ground and 400 V phase to
phase in the 4-conductor system or
• 400 V phase to phase in the 3-conductor
system.
The rated voltages and surge voltages correspond
to overvoltage category 300 V CATIII.
Establishing the connection to the PC
The most common connection for the communication
between the PC and device:
Fig. Rear of UMG 96-S2
Three-phase 4-conductor systems
with grounded neutral conductor
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
IEC U
L-N
/ U
L-L:
230 V
LN
/ 400 V
LL
The device can be used
• in TN and TT networks
• residential and industrial sectors.
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Voltage measurement in the three-
phase 4-conductor system
Voltage measurement in the single-
phase 3-conductor system
V 1 V
2
V
3
V N
V 1 V
2
V 3 V N
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Current measurement via
the current transformer in the three-
phase 4-conductor system
Current measurement
in the single-phase 3-conductor
system
Three-phase 4-conductor
systems
Current measurement via 2
current transformers in the three-
phase 4-conductor system
1.
(gedrehtes Patchkabel)
PC
RS232 RS232
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
2.
Ethernet
(gedrehtes Patchkabel)
PC UMG 604
Device connection via a UMG 604 as
a gateway.
UMG 96-S2
UMG 96 S2
RS485
RS485
3.
(gedrehtes Patchkabel)
PC
USB USB
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
CAUTION
Risk of injury or damage to device.
Noncompliance with the connection
conditions for the voltage measurement inputs
can injure you or damage the device.
Therefore, please note the following:
• The voltage measurement inputs
- must not be connected to DC current.
- must be provided with a suitable,
labeled fuse and circuit breaker
(alternative: miniature circuit breaker)
in their immediate vicinity.
- are dangerous to touch.
•
Voltages that exceed the allowed
nominal network voltages must be
connected via voltage transformers.
• Measured voltages and measured
currents must originate from the same
network.
NOTE
You can easily configure the
voltage
transformer ratios
via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios
and their setting in the user manual.
WARNING
Risk of injury due to electric voltage!
It may result in serious bodily harm or death
due to:
• Touching live exposed or stripped cores.
• Device and current transformer inputs that
are dangerous to touch.
Before starting work, disconnect your
system from the power supply. Verify that
there is no current.
Ground the system. Use the ground
connection point with the ground symbol
for this. Also ground the secondary
windings of current transformers and all
metal parts of the transformer accessible
to contact!
WARNING
Risk of injury due to high currents and high
electrical voltages!
Open current transformers that are operated
on the secondary side (high voltage spikes) can
result in serious bodily harm or even death.
Avoid the open operation of the current
transformers. Overloaded transformers short circuit!
NOTE
You can easily configure the current
transformer ratios
via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios and
their setting in the user manual.
Connection
“Current measurement via current transformer”
15 13
Programming the parameters Operation and button functions
Example: PC connection via RS485 interface and UMG 604 as the gateway 12 14
1. Switch into programming mode.
2. The symbols
PRG
for the programming mode
and
CT
for the current transformer appear.
3. Switch into programming mode for
the parameter list by pressing key 2 twice.
4. The input area for the parameter list appears.
5. Confirm with key 1 - the first number of
the parameter address flashes.
6. Select the value of the 1st number using key 2 .
7. Continue the procedure for the next
numbers of the parameter address and for
the parameter settings.
8. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch back
to the input area for the current transformer
using key 2.
Setting the device address (parameter address 000)
A master device can distinguish the UMGs based
on the device address in a master/slave network
via the RS485 interface.
For devices within this network, make sure that
for each parameter address 000
• different device addresses are assigned.
• the parameter setting of parameter address 000
is within the range of 1 to 247 (0 and 248 to 255
are reserved).
Setting the baud rate (parameter address 001)
For each device in a master/slave network via
the RS485 interface:
• select a uniform baud rate (parameter address 001)
(0= 9.6 kbps, 2=19.2 kbps, 3=38.4 kbps).
• select the number of stop bits (parameter address
003) (0=1 bit, 1=2 bits, 2=even parity, 3=odd
parity).
Data bits (8) and parity (none) are set.
Parameter address
Programming mode
Parameter setting
Fig. “Parameter list”
input area
The operation of the device occurs via the keys 1
and 2 with following differences:
• briefly pressing (key 1 or 2):
next step (+1).
• long pressing (key 1 or 2):
previous step (-1).
The device distinguishes between display mode
and programming mode.
Display mode
• Page between the measured value displays
using keys 1 and 2.
• The measured value display shows up
to 3 measured values.
• A time for the automatic display change
between the measured value displays can
be configured in the GridVis® software.
Programming mode
• Hold down key 1 and 2 simultaneously for
1 second in order to switch between display
mode and programming mode . The text PRG
appears in the display.
• The settings necessary for the operation
of the device are configured in programming
mode.
Key 1
Key 2
Delivery
Average
CT: Current transformer
VT: Voltage transformer
K1: Output 1
Password
Outer conductor/
outer conductor
Summation measurement
Programming
mode
Minimum value, NT/delivery
• Programming mode can be protected with a user
password.
• Switch between the programming menus using key 2:
1. Current transformer
2. Voltage transformer
3. Parameter list
To switch from programming mode into display mode ,
• press keys 1 and 2 simultaneously for 1 s.
• Do not press any keys for 60 s (automatic).
Programming the current transformer
1. Switch into programming mode.
2. The symbols
PRG for the programming mode
and CT for the current transformer appear.
3. Confirm with key 1 - the first number of
the input area for the primary current flashes.
4. Select the value of the 1st number using key 2 .
5. Switch to the 2nd number using key 1 .
6. Select the value of the 2nd number with key 2 .
7. Switch to the 3rd number using key 1 .
8. Select the value of the 3rd number using key 2 .
9. Confirm using key 1.
10. The complete number flashes.
11. Select the decimal place and therefore
the unit of the primary current using key 2.
12. Confirm using key 1.
13. The input area for the secondary current
flashes.
14. Set the secondary current (value 1 A or 5 A)
using key 2.
15. Confirm using key 1.
16. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch
to the input area for the voltage transformer
using key 2.
Current transformer
symbol
Unit display
Current transformer,
primary
Programming mode
Current transformer,
secondary
Fig. “Current transformer” input area
Programming the voltage transformer
1. Switch into programming mode.
2. The symbols
PRG for the programming
mode and CT for the current transformer
appear.
3. Switch into programming mode for
the voltage transformer using key 2.
4. The symbols PRG for the programming mode
and VT for the voltage transformer appear.
5. Confirm with key 1 - the first number of
the input area for the primary voltage flashes.
6. Select the value of the 1st number using key 2 .
7. Switch to the 2nd number using key 1 .
8. Select the value of the 2nd number with key 2 .
9. Switch to the 3rd number using key 1 .
10. Select the value of the 3rd number using key 2 .
11. Confirm using key 1.
12. The complete number flashes.
13. Select the decimal place and therefore
the unit of the primary voltage using key 2.
14. Confirm using key 1.
15. The input area for the secondary voltage
flashes.
16. Set the secondary voltage using key 2.
17. Confirm using key 1.
18. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch into
programming mode for the parameter list
using key 2.
Unit display
Voltage transformer,
primary
Programming mode
Voltage transformer,
secondary
Voltage transformer
symbol
Fig. “Voltage transformer” input area
11
Correct
Terminal strip (switching cabinet) .
Device with RS485 interface
(without termination resistor).
Incorrect
Device with RS485 interface
(termination resistor on
the device).
RS485 bus structure
• Connect all devices in the RS485 bus structure
(line) according to the master/slave principle.
• A segment of a RS485 bus structure
can contain up to 32 participants/devices.
• Terminate the cable with termination resistors
(120 Ω, 0.25 W) at the beginning and end of
a segment. The UMG 96-S2 does not contain
a termination resistor.
• With more than 32 participants, use repeaters
to connect segments.
NOTE
Changes only become active after exiting
programming mode.
NOTE
Next, the most important programming
menus for a quick start,
Current transformer,
Voltage transformer and Parameter list ,
are explained.
Further information about the operation,
displays and key functions of your device
can be found in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the current transformers
and current transformer ratios can be found
in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the voltage transformers
and voltage transformer ratios can be found in
the user manual.
NOTE
• A comprehensive parameter list with setting
ranges and default settings can be found
in the user manual or the Modbus address list
on our web site.
• The parameter addresses for the device
address (000) and the baud rate (001) are
explained next. NOTE
For the integration of the UMG 96-S2 into an
RS485 bus structure (master/slave principle)
with UMG 604 as the master device, first
• enter a 1 (Modbus RTU/master) in Address
203 of the UMG 604!
15 13
www
.janitza.com
Doc no. 2.062.010.1d
10/2018
Item no. 33.03.372
Max. value HT/reference
S1 S2
S1 S2
S1 S2
L2
L3
N
L1
Programming the parameters
Example: PC connection via RS485 interface and UMG 604 as the gateway
Operation and button functions
NOTE
Further information on the parameter lists, de-
vice addresses and baud rates can be found
in the user manual.
The UMG 96-S2 communicates with a PC
via the serial RS485 interface and a UMG 604
as a gateway:
Connection of
further slave
devices
data GND
A
B
C
RS485 Bus
A
B
Functional ground
Connection
to the
UMG 604
as gateway
(master)
data GND
NOTE
To prevent the addition of residual current when
using several devices, mount the data GND as
a functional ground (see fig. on the left)!
C
www
.janitza.de
Doc no. 2.062.010.0
04/2018
Item no. 33.03.
xxx
You can find more detailed information about the
device configuration and communication starting
in step 11.
NOTE
Alternatively to the fuse and circuit breaker, a
miniature circuit breaker can also be used.
16 17
Technical data
Voltage measurement
Three-phase 4-conductor
systems with nominal
voltages up to
230 V/400 V (+-10%) according
to IEC
Overvoltage category 300 V CAT III
Rated surge voltage 4 kV
Fuse for the voltage
measurement 1 - 10 A
(with IEC/UL approval)
Measuring range L-N
0 1) .. 300 Vrms
(max. overvoltage 400 Vrms)
Measuring range L-L
0 1) .. 425 Vrms
(max. overvoltage 620 Vrms)
Limit value for the
measuring range overflow
U L-N
> 300 Vrms
Resolution 0.01 V
Crest factor
1.9 (related to the measurement
range)
Impedance 3 MΩ/phase
Power consumption Approx. 0.1 VA
Sampling frequency 8 kHz
Frequency of the
basic oscillation
- resolution
45 Hz .. 65 Hz
0.01 Hz
1) The device only determines the measured values if voltage
L1-N is greater than 20 Veff (4-conductor measurement)
or voltage L1-L2 is greater than 34 Veff (3-conductor
measurement) on voltage measurement input V1.
Current measurement
Rated current x/1 and x/5 A
Measuring range 0 .. 6 Arms
Limit value for the measuring
range overflow I
> 7 Aeff
Crest factor (based on the
rated current)
2
Resolution 1 mA (display 0.01 A)
Overvoltage category 300 V CAT II
Rated surge voltage 2 kV
Power consumption approx. 0.2 VA (Ri=5 mΩ)
Overload for 1 s 60 A (sinusoidal)
Sampling frequency 8 kHz
Supply voltage
Nominal range
230 V :
AC 90 V - 265 V (50/60 Hz) or
DC 90 V - 250 V, 300 V CATIII
Operating range +-10% of nominal range
Power consumption
230 V
: max. 1.5 VA / 0.5 W
Internal fuse,
not exchangeable Type T1A / 250 VDC / 277 VAC
according to IEC 60127
Recommended overcur-
rent protection device for
the line protection 230 V : 6-16 A
(Char. B)
(IEC-/UL approval)
General information
Net weight (with attached
connectors)
Approx. 250 g
Packaging weight (including
accessories)
Approx. 500 g
Impact resistance IK07 according to IEC 62262
Transport and storage
The following information applies to devices which are
transported or stored in the original packaging.
Free fall
1 m
Temperature K55 (-25 °C up to +70 °C)
Relative humidity 0 to 90% RH
Ambient conditions during operation
Use the UMG 96-S2 in a weather-protected, stationary application.
Protection class II in accordance with IEC 60536 (VDE 0106, Part 1).
Operating temperature
range
K55 (-10° C .. +55° C)
Relative humidity 0 to 75% RH
Operating altitude 0 .. 2000 m above sea level
Degree of pollution 2
Installation position discretionary
Ventilation
No external ventilation
required
Protection against
foreign bodies and water
- Front
- Rear
- Front side with sealing
IP40 i.a.w. EN60529
IP20 i.a.w. EN60529
IP54 i.a.w. EN60529
Digital outputs
1 digital output, semiconductor relay, not short-circuit proof.
Switching voltage
max. 60 V DC
Switching current max. 50 mAeff DC
Pulse output (energy pulse) Max. 12.5 Hz
Serial interface
RS485 - Modbus RTU/slave
9.6 kbps, 19.2 kbps,
38.4 kbps
Stripping length 7 mm
Terminal connection capacity (supply voltage)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm 2 , AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (digital interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 -16
Terminal pins, core end sheath 0.2 - 1.5 mm
2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (current measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm
2
, AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (serial interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 - 16
Terminal pins, core end sheath 0.2 - 1.5 mm
2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (voltage measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm 2 , AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Procedure in the event of errors
Possible error Cause Remedy
No display
External fuse for the power supply voltage has
tripped.
Replace fuse.
No current display
Measured voltage is not connected. Connect the measured voltage.
Measurement current is not connected. Connect measurement current.
Current displayed is too large
or too small.
Current measurement in the wrong phase. Check connection and correct if necessary.
Current transformer factor is incorrectly programmed. Read out and program the current transformer
transformation ratio at the current transformer.
Current harmonics exceed the current peak value at
the measurement input
Install current transformer with a larger CT ratio.
The current at the measurement input was not
achieved.
Install current transformer with a smaller current
transformer ratio.
Voltage displayed is too large
or too small.
Measurement in the wrong phase. Check connection and correct if necessary.
Voltage transformer incorrectly programmed.
Read out and program the voltage transformer ratio
at the voltage transformer.
Voltage displayed is too
small.
Measurement range exceeded. Install voltage transformers.
The peak voltage value at the measurement input has
been exceeded by harmonic components.
Attention! Ensure the measurement inputs are not
overloaded.
Active power is too large or
too small. *
The programmed voltage transformer transmission
ratio is incorrect
Read the current transformer transmission ratio on
the current transformer and program it in the GridVis
software.
A current path is assigned to the wrong voltage path. Check connection and correct if necessary (GridVis).
The programmed voltage transformer transmission
ratio is incorrect
Read the voltage transformer transmission ratio on
the voltage transformer and program it in the GridVis
software.
Possible error Cause Remedy
Active power reference/deliv-
ery is reversed.
At least one current transformer connection is
reversed.
Check connection and correct if necessary (GridVis).
A current path is assigned to the wrong voltage path.
No connection to the device
RS485: Device address incorrect or incorrect
protocol
Set device address / select protocol
"EE" in the display See “Error messages” in the user manual.
Device still does not work
despite the above measures.
Device defective.
Send the device to the manufacturer for inspection
and testing.
NOTE
More technical data can be found in the device
user manual.
NOTE
Property damage due to overloaded measurement inputs!
Too high current and voltage values overload the measurement inputs.
Observe the limit values specified on the rating plate and in the user manual!
General information
1 2
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
Fax +49 6441 9642-30
E-mail: info@janitza.de
www.janitza.com
Energy Analyser
UMG 96-S2
Installation instructions

Installation

Device settings
German version:
see r
ear side
3 4 2
Safety
Safety instructions
The installation instructions do not include
a complete list of all safety measures necessary
for operating the device.
Special operating conditions may require
additional measures. The installation
instructions contain notes that must be
observed for your personal safety and to
prevent property damage.
Used symbols:
The additional symbol
on the device itself indicates
an electrical danger that can
result in serious injuries or death.
The general warning symbol calls
attention to possible risks of
injury. Observe all the instructions
listed under this symbol in order
to prevent injuries or even death.
Safety instructions are highlighted by a warning
triangle and are presented as follows depending
on the level of risk:
Safety measures
When operating electrical devices, specific parts
of these devices inevitably carry dangerous
voltage. As a result, serious bodily harm or
property damage can occur if they are not
handled correctly:
• Before connecting the device, ground it at
the protective conductor terminal if available.
• Dangerous voltages may be present in all
circuit parts connected to the voltage supply.
• There may still be dangerous voltages present
in the device even after it is disconnected
from the supply voltage (capacitor storage).
• Do not operate operating equipment
with open current transformer circuits.
• Do not exceed the limit values specified
in the user manual and on the rating
plate. This must also be observed during
inspections and commissioning.
• Observe the safety instructions and warning
notices in the documents that accompany
the devices.
Qualified personnel
To prevent personal injuries and property
damage, only qualified personnel with electrical
engineering training may work on the device.
They must also have knowledge
• Of the national accident prevention regulations
• In safety technology standards
• In the installation, commissioning and
operation of the device.
Intended use
The device is
• intended for installation in switching cabinets
and small installation distributors. The device
can be installed in any mounting position
(please observe section 3 “Assembly”).
• not intended for installation in vehicles! Using
the device in mobile equipment is considered
an unusual environmental condition and is
only permissible by special agreement.
• not intended for installation in areas exposed
to harmful oils, acids, gases, vapors, dust
and radiation, etc.
The prerequisites for smooth and safe operation
of the device include proper transport, storage,
setup and assembly, as well as proper operation
and maintenance.
The UMG 96-S2 is a power analyzer that:
• measures and calculates electrical
parameters, such as voltage, current,
frequency, power, work, harmonics
(up to the 15th, odd), etc. in building
installations, on distribution units, circuit
breakers and busbar trunking systems.
• displays measurement results
and transfers them via interfaces.
Brief device description
Install the UMG 96-S2 in the weather-protected
front panel of switching cabinets.
Cut-out size:
92
+0.8
x 92
+0.8
mm
Please ensure the following:
Sufficient ventilation
• Observe the clearance to
adjacent components.
• Can be installed in any
position.
Fig. Installation position
rear view of UMG 96-S2
Assembly Connecting the supply voltage
The supply voltage level for your device is specified
on the rating plate.
After connecting the supply voltage, a display
appears. If no display appears, check whether
the supply voltage is within the rated voltage range.
N
L
User manual:
Disclaimer
It is essential that the information products
for the devices are observed to ensure
safe operation and achieve the specified
performance characteristics and product
features. Janitza electronics GmbH assumes no
liability for personal injuries, property damage
and financial losses resulting from the failure to
observe the information products.
Make sure that your information products are
legible and accessible.
Further documentation can be found on our
web site www.janitza.com under Support >
Downloads.
Copyright notice
© 2018 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing,
distribution and any other kind of use, even
in part, is prohibited.
Subject to technical changes.
• Make sure that the installation instructions
match your device.
• First, make sure you have read and understood
the document accompanying the product.
• Keep the documents accompanying
the product accessible through its service
life and hand them over to the subsequent
owner where applicable.
• Please refer to www.janitza.com for information
concerning device revisions and the associated
adjustments to the documentation accompanying
the product.
Disposal
Please observe the national regulations.
Dispose of individual parts, where necessary,
depending on the properties and existing
country-specific regulations, e.g. as:
• Electronic waste
• Plastic
• Metal
or commission a certified disposal company
with the scrapping.
Relevant laws,
applied standards and directives
Please refer to the Declaration of Conformity
on our web site (www.janitza.com) for the
laws, standards and directives applied by
Janitza electronics GmbH.
NOTE
Points out procedures during which a danger
of injuries or property damage does
not
exist.
ATTENTION
Indicates an imminently dangerous situation that
can result in property damage or environmental
damage in the event of noncompliance.
CAUTION
Indicates a potentially dangerous situation
that can result in minor injuries or property
damage.
WARNING
Indicates a potentially dangerous situation
that can result in serious injuries or death.
DANGER
Indicates an imminent danger that will result
in serious and/or fatal injuries.
ATTENTION
Noncompliance with the assembly instructions
can damage or destroy your device.
Ensure sufficient air circulation in your installation
environment and, where applicable, sufficient
cooling with high ambient temperatures.
NOTE
You can find more detailed information about
the device functions, data and assembly
in the user manual.
WARNING
Risk of injury due to defective devices.
Devices, which may have possibly been
damaged due to an improper use, can
no longer fulfill the safety regulations and
represent a risk of injury.
Shut down the device immediately
and secure it against inadvertent
commissioning if the device:
• has visible damage,
• no longer functions despite an intact
power supply,
• was exposed to a prolonged period
of unfavorable conditions
or transport stresses. DANGER
Risk of injury due to electric voltage!
It may result in serious bodily harm or death due to:
• Touching live exposed or stripped cores.
• Device inputs that are dangerous to touch.
Before starting work, disconnect your system
from the power supply. Verify that there
is no current.
ATTENTION
Noncompliance of the connection conditions
or exceeding the permissible voltage range
can damage or destroy your device.
Before you connect the device to the supply
voltage, please observe the following:
• The voltage and frequency must comply
with the specifications on the rating
plate. Observe the limit values as
described in the user manual.
• In building installations, secure
the supply voltage with a UL/IEC-listed
circuit breaker/fuse.
•
The circuit breaker
-
must be easily accessible
for the user and located in the vicinity
of the device.
- must be labeled for the respective
device.
• Do not tap the supply voltage at
the voltage transformers.
• Provide a fuse for the neutral conductor
if the neutral conductor connection
is not grounded to the source.
Fuse
Fig. supply voltage connection.
Circuit breaker
Fig. supply voltage connection.
8 5 6
The device
• is only approved for a current measurement
using the current transformer.
• is designed for the connection of current
transformers with secondary currents
of ../1 A and ../5 A.
• has the current transformer ratio set to 5/5 A
by default.
7
Voltage measurement
The device has 3 voltage inputs and is suitable
for different connection versions.
10 9
Network systems
Suitable network systems and maximum nominal voltages (DIN EN 61010-1/A1):
Circuit breaker
Fuse (UL/IEC-listed)
L2
L3
N
L1
“Direct voltage measurement in a three-phase
4-conductor system” connection version
Voltage measurement connection versions
Load
Current measurement I1, I2, I3 Current measurement connection versions I1, I2, I3
The voltage measurement inputs are designed
for measurements in the low-voltage networks
in which nominal voltages occur up to
• 230 V phase to ground and 400 V phase to
phase in the 4-conductor system or
• 400 V phase to phase in the 3-conductor
system.
The rated voltages and surge voltages correspond
to overvoltage category 300 V CATIII.
Establishing the connection to the PC
The most common connection for the communication
between the PC and device:
Fig. Rear of UMG 96-S2
Three-phase 4-conductor systems
with grounded neutral conductor
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
IEC U
L-N
/ U
L-L:
230 V
LN
/ 400 V
LL
The device can be used
• in TN and TT networks
• residential and industrial sectors.
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Voltage measurement in the three-
phase 4-conductor system
Voltage measurement in the single-
phase 3-conductor system
V 1 V
2
V
3
V N
V 1 V
2
V 3 V N
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Current measurement via
the current transformer in the three-
phase 4-conductor system
Current measurement
in the single-phase 3-conductor
system
Three-phase 4-conductor
systems
Current measurement via 2
current transformers in the three-
phase 4-conductor system
1.
(gedrehtes Patchkabel)
PC
RS232 RS232
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
2.
Ethernet
(gedrehtes Patchkabel)
PC UMG 604
Device connection via a UMG 604 as
a gateway.
UMG 96-S2
UMG 96 S2
RS485
RS485
3.
(gedrehtes Patchkabel)
PC
USB USB
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
CAUTION
Risk of injury or damage to device.
Noncompliance with the connection
conditions for the voltage measurement inputs
can injure you or damage the device.
Therefore, please note the following:
• The voltage measurement inputs
- must not be connected to DC current.
- must be provided with a suitable,
labeled fuse and circuit breaker
(alternative: miniature circuit breaker)
in their immediate vicinity.
- are dangerous to touch.
•
Voltages that exceed the allowed
nominal network voltages must be
connected via voltage transformers.
• Measured voltages and measured
currents must originate from the same
network.
NOTE
You can easily configure the
voltage
transformer ratios
via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios
and their setting in the user manual.
WARNING
Risk of injury due to electric voltage!
It may result in serious bodily harm or death
due to:
• Touching live exposed or stripped cores.
• Device and current transformer inputs that
are dangerous to touch.
Before starting work, disconnect your
system from the power supply. Verify that
there is no current.
Ground the system. Use the ground
connection point with the ground symbol
for this. Also ground the secondary
windings of current transformers and all
metal parts of the transformer accessible
to contact!
WARNING
Risk of injury due to high currents and high
electrical voltages!
Open current transformers that are operated
on the secondary side (high voltage spikes) can
result in serious bodily harm or even death.
Avoid the open operation of the current
transformers. Overloaded transformers short circuit!
NOTE
You can easily configure the current
transformer ratios
via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios and
their setting in the user manual.
Connection
“Current measurement via current transformer”
15 13
Programming the parameters Operation and button functions
Example: PC connection via RS485 interface and UMG 604 as the gateway 12 14
1. Switch into programming mode.
2. The symbols
PRG
for the programming mode
and
CT
for the current transformer appear.
3. Switch into programming mode for
the parameter list by pressing key 2 twice.
4. The input area for the parameter list appears.
5. Confirm with key 1 - the first number of
the parameter address flashes.
6. Select the value of the 1st number using key 2 .
7. Continue the procedure for the next
numbers of the parameter address and for
the parameter settings.
8. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch back
to the input area for the current transformer
using key 2.
Setting the device address (parameter address 000)
A master device can distinguish the UMGs based
on the device address in a master/slave network
via the RS485 interface.
For devices within this network, make sure that
for each parameter address 000
• different device addresses are assigned.
• the parameter setting of parameter address 000
is within the range of 1 to 247 (0 and 248 to 255
are reserved).
Setting the baud rate (parameter address 001)
For each device in a master/slave network via
the RS485 interface:
• select a uniform baud rate (parameter address 001)
(0= 9.6 kbps, 2=19.2 kbps, 3=38.4 kbps).
• select the number of stop bits (parameter address
003) (0=1 bit, 1=2 bits, 2=even parity, 3=odd
parity).
Data bits (8) and parity (none) are set.
Parameter address
Programming mode
Parameter setting
Fig. “Parameter list”
input area
The operation of the device occurs via the keys 1
and 2 with following differences:
• briefly pressing (key 1 or 2):
next step (+1).
• long pressing (key 1 or 2):
previous step (-1).
The device distinguishes between display mode
and programming mode.
Display mode
• Page between the measured value displays
using keys 1 and 2.
• The measured value display shows up
to 3 measured values.
• A time for the automatic display change
between the measured value displays can
be configured in the GridVis® software.
Programming mode
• Hold down key 1 and 2 simultaneously for
1 second in order to switch between display
mode and programming mode . The text PRG
appears in the display.
• The settings necessary for the operation
of the device are configured in programming
mode.
Key 1
Key 2
Delivery
Average
CT: Current transformer
VT: Voltage transformer
K1: Output 1
Password
Outer conductor/
outer conductor
Summation measurement
Programming
mode
Minimum value, NT/delivery
• Programming mode can be protected with a user
password.
• Switch between the programming menus using key 2:
1. Current transformer
2. Voltage transformer
3. Parameter list
To switch from programming mode into display mode ,
• press keys 1 and 2 simultaneously for 1 s.
• Do not press any keys for 60 s (automatic).
Programming the current transformer
1. Switch into programming mode.
2. The symbols
PRG for the programming mode
and CT for the current transformer appear.
3. Confirm with key 1 - the first number of
the input area for the primary current flashes.
4. Select the value of the 1st number using key 2 .
5. Switch to the 2nd number using key 1 .
6. Select the value of the 2nd number with key 2 .
7. Switch to the 3rd number using key 1 .
8. Select the value of the 3rd number using key 2 .
9. Confirm using key 1.
10. The complete number flashes.
11. Select the decimal place and therefore
the unit of the primary current using key 2.
12. Confirm using key 1.
13. The input area for the secondary current
flashes.
14. Set the secondary current (value 1 A or 5 A)
using key 2.
15. Confirm using key 1.
16. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch
to the input area for the voltage transformer
using key 2.
Current transformer
symbol
Unit display
Current transformer,
primary
Programming mode
Current transformer,
secondary
Fig. “Current transformer” input area
Programming the voltage transformer
1. Switch into programming mode.
2. The symbols
PRG for the programming
mode and CT for the current transformer
appear.
3. Switch into programming mode for
the voltage transformer using key 2.
4. The symbols PRG for the programming mode
and VT for the voltage transformer appear.
5. Confirm with key 1 - the first number of
the input area for the primary voltage flashes.
6. Select the value of the 1st number using key 2 .
7. Switch to the 2nd number using key 1 .
8. Select the value of the 2nd number with key 2 .
9. Switch to the 3rd number using key 1 .
10. Select the value of the 3rd number using key 2 .
11. Confirm using key 1.
12. The complete number flashes.
13. Select the decimal place and therefore
the unit of the primary voltage using key 2.
14. Confirm using key 1.
15. The input area for the secondary voltage
flashes.
16. Set the secondary voltage using key 2.
17. Confirm using key 1.
18. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch into
programming mode for the parameter list
using key 2.
Unit display
Voltage transformer,
primary
Programming mode
Voltage transformer,
secondary
Voltage transformer
symbol
Fig. “Voltage transformer” input area
11
Correct
Terminal strip (switching cabinet) .
Device with RS485 interface
(without termination resistor).
Incorrect
Device with RS485 interface
(termination resistor on
the device).
RS485 bus structure
• Connect all devices in the RS485 bus structure
(line) according to the master/slave principle.
• A segment of a RS485 bus structure
can contain up to 32 participants/devices.
• Terminate the cable with termination resistors
(120 Ω, 0.25 W) at the beginning and end of
a segment. The UMG 96-S2 does not contain
a termination resistor.
• With more than 32 participants, use repeaters
to connect segments.
NOTE
Changes only become active after exiting
programming mode.
NOTE
Next, the most important programming
menus for a quick start,
Current transformer,
Voltage transformer and Parameter list ,
are explained.
Further information about the operation,
displays and key functions of your device
can be found in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the current transformers
and current transformer ratios can be found
in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the voltage transformers
and voltage transformer ratios can be found in
the user manual.
NOTE
• A comprehensive parameter list with setting
ranges and default settings can be found
in the user manual or the Modbus address list
on our web site.
• The parameter addresses for the device
address (000) and the baud rate (001) are
explained next. NOTE
For the integration of the UMG 96-S2 into an
RS485 bus structure (master/slave principle)
with UMG 604 as the master device, first
• enter a 1 (Modbus RTU/master) in Address
203 of the UMG 604!
15 13
www
.janitza.com
Doc no. 2.062.010.1d
10/2018
Item no. 33.03.372
Max. value HT/reference
S1 S2
S1 S2
S1 S2
L2
L3
N
L1
Programming the parameters
Example: PC connection via RS485 interface and UMG 604 as the gateway
Operation and button functions
NOTE
Further information on the parameter lists, de-
vice addresses and baud rates can be found
in the user manual.
The UMG 96-S2 communicates with a PC
via the serial RS485 interface and a UMG 604
as a gateway:
Connection of
further slave
devices
data GND
A
B
C
RS485 Bus
A
B
Functional ground
Connection
to the
UMG 604
as gateway
(master)
data GND
NOTE
To prevent the addition of residual current when
using several devices, mount the data GND as
a functional ground (see fig. on the left)!
C
www
.janitza.de
Doc no. 2.062.010.0
04/2018
Item no. 33.03.
xxx
You can find more detailed information about the
device configuration and communication starting
in step 11.
NOTE
Alternatively to the fuse and circuit breaker, a
miniature circuit breaker can also be used.
16 17
Technical data
Voltage measurement
Three-phase 4-conductor
systems with nominal
voltages up to
230 V/400 V (+-10%) according
to IEC
Overvoltage category 300 V CAT III
Rated surge voltage 4 kV
Fuse for the voltage
measurement 1 - 10 A
(with IEC/UL approval)
Measuring range L-N
0 1) .. 300 Vrms
(max. overvoltage 400 Vrms)
Measuring range L-L
0 1) .. 425 Vrms
(max. overvoltage 620 Vrms)
Limit value for the
measuring range overflow
U L-N
> 300 Vrms
Resolution 0.01 V
Crest factor
1.9 (related to the measurement
range)
Impedance 3 MΩ/phase
Power consumption Approx. 0.1 VA
Sampling frequency 8 kHz
Frequency of the
basic oscillation
- resolution
45 Hz .. 65 Hz
0.01 Hz
1) The device only determines the measured values if voltage
L1-N is greater than 20 Veff (4-conductor measurement)
or voltage L1-L2 is greater than 34 Veff (3-conductor
measurement) on voltage measurement input V1.
Current measurement
Rated current x/1 and x/5 A
Measuring range 0 .. 6 Arms
Limit value for the measuring
range overflow I
> 7 Aeff
Crest factor (based on the
rated current)
2
Resolution 1 mA (display 0.01 A)
Overvoltage category 300 V CAT II
Rated surge voltage 2 kV
Power consumption approx. 0.2 VA (Ri=5 mΩ)
Overload for 1 s 60 A (sinusoidal)
Sampling frequency 8 kHz
Supply voltage
Nominal range
230 V :
AC 90 V - 265 V (50/60 Hz) or
DC 90 V - 250 V, 300 V CATIII
Operating range +-10% of nominal range
Power consumption
230 V
: max. 1.5 VA / 0.5 W
Internal fuse,
not exchangeable Type T1A / 250 VDC / 277 VAC
according to IEC 60127
Recommended overcur-
rent protection device for
the line protection 230 V : 6-16 A
(Char. B)
(IEC-/UL approval)
General information
Net weight (with attached
connectors)
Approx. 250 g
Packaging weight (including
accessories)
Approx. 500 g
Impact resistance IK07 according to IEC 62262
Transport and storage
The following information applies to devices which are
transported or stored in the original packaging.
Free fall
1 m
Temperature K55 (-25 °C up to +70 °C)
Relative humidity 0 to 90% RH
Ambient conditions during operation
Use the UMG 96-S2 in a weather-protected, stationary application.
Protection class II in accordance with IEC 60536 (VDE 0106, Part 1).
Operating temperature
range
K55 (-10° C .. +55° C)
Relative humidity 0 to 75% RH
Operating altitude 0 .. 2000 m above sea level
Degree of pollution 2
Installation position discretionary
Ventilation
No external ventilation
required
Protection against
foreign bodies and water
- Front
- Rear
- Front side with sealing
IP40 i.a.w. EN60529
IP20 i.a.w. EN60529
IP54 i.a.w. EN60529
Digital outputs
1 digital output, semiconductor relay, not short-circuit proof.
Switching voltage
max. 60 V DC
Switching current max. 50 mAeff DC
Pulse output (energy pulse) Max. 12.5 Hz
Serial interface
RS485 - Modbus RTU/slave
9.6 kbps, 19.2 kbps,
38.4 kbps
Stripping length 7 mm
Terminal connection capacity (supply voltage)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm 2 , AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (digital interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 -16
Terminal pins, core end sheath 0.2 - 1.5 mm
2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (current measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm
2
, AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (serial interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 - 16
Terminal pins, core end sheath 0.2 - 1.5 mm
2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (voltage measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm 2 , AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Procedure in the event of errors
Possible error Cause Remedy
No display
External fuse for the power supply voltage has
tripped.
Replace fuse.
No current display
Measured voltage is not connected. Connect the measured voltage.
Measurement current is not connected. Connect measurement current.
Current displayed is too large
or too small.
Current measurement in the wrong phase. Check connection and correct if necessary.
Current transformer factor is incorrectly programmed. Read out and program the current transformer
transformation ratio at the current transformer.
Current harmonics exceed the current peak value at
the measurement input
Install current transformer with a larger CT ratio.
The current at the measurement input was not
achieved.
Install current transformer with a smaller current
transformer ratio.
Voltage displayed is too large
or too small.
Measurement in the wrong phase. Check connection and correct if necessary.
Voltage transformer incorrectly programmed.
Read out and program the voltage transformer ratio
at the voltage transformer.
Voltage displayed is too
small.
Measurement range exceeded. Install voltage transformers.
The peak voltage value at the measurement input has
been exceeded by harmonic components.
Attention! Ensure the measurement inputs are not
overloaded.
Active power is too large or
too small. *
The programmed voltage transformer transmission
ratio is incorrect
Read the current transformer transmission ratio on
the current transformer and program it in the GridVis
software.
A current path is assigned to the wrong voltage path. Check connection and correct if necessary (GridVis).
The programmed voltage transformer transmission
ratio is incorrect
Read the voltage transformer transmission ratio on
the voltage transformer and program it in the GridVis
software.
Possible error Cause Remedy
Active power reference/deliv-
ery is reversed.
At least one current transformer connection is
reversed.
Check connection and correct if necessary (GridVis).
A current path is assigned to the wrong voltage path.
No connection to the device
RS485: Device address incorrect or incorrect
protocol
Set device address / select protocol
"EE" in the display See “Error messages” in the user manual.
Device still does not work
despite the above measures.
Device defective.
Send the device to the manufacturer for inspection
and testing.
NOTE
More technical data can be found in the device
user manual.
NOTE
Property damage due to overloaded measurement inputs!
Too high current and voltage values overload the measurement inputs.
Observe the limit values specified on the rating plate and in the user manual!
General information
1 2
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
Fax +49 6441 9642-30
E-mail: info@janitza.de
www.janitza.com
Energy Analyser
UMG 96-S2
Installation instructions

Installation

Device settings
German version:
see r
ear side
3 4 2
Safety
Safety instructions
The installation instructions do not include
a complete list of all safety measures necessary
for operating the device.
Special operating conditions may require
additional measures. The installation
instructions contain notes that must be
observed for your personal safety and to
prevent property damage.
Used symbols:
The additional symbol
on the device itself indicates
an electrical danger that can
result in serious injuries or death.
The general warning symbol calls
attention to possible risks of
injury. Observe all the instructions
listed under this symbol in order
to prevent injuries or even death.
Safety instructions are highlighted by a warning
triangle and are presented as follows depending
on the level of risk:
Safety measures
When operating electrical devices, specific parts
of these devices inevitably carry dangerous
voltage. As a result, serious bodily harm or
property damage can occur if they are not
handled correctly:
• Before connecting the device, ground it at
the protective conductor terminal if available.
• Dangerous voltages may be present in all
circuit parts connected to the voltage supply.
• There may still be dangerous voltages present
in the device even after it is disconnected
from the supply voltage (capacitor storage).
• Do not operate operating equipment
with open current transformer circuits.
• Do not exceed the limit values specified
in the user manual and on the rating
plate. This must also be observed during
inspections and commissioning.
• Observe the safety instructions and warning
notices in the documents that accompany
the devices.
Qualified personnel
To prevent personal injuries and property
damage, only qualified personnel with electrical
engineering training may work on the device.
They must also have knowledge
• Of the national accident prevention regulations
• In safety technology standards
• In the installation, commissioning and
operation of the device.
Intended use
The device is
• intended for installation in switching cabinets
and small installation distributors. The device
can be installed in any mounting position
(please observe section 3 “Assembly”).
• not intended for installation in vehicles! Using
the device in mobile equipment is considered
an unusual environmental condition and is
only permissible by special agreement.
• not intended for installation in areas exposed
to harmful oils, acids, gases, vapors, dust
and radiation, etc.
The prerequisites for smooth and safe operation
of the device include proper transport, storage,
setup and assembly, as well as proper operation
and maintenance.
The UMG 96-S2 is a power analyzer that:
• measures and calculates electrical
parameters, such as voltage, current,
frequency, power, work, harmonics
(up to the 15th, odd), etc. in building
installations, on distribution units, circuit
breakers and busbar trunking systems.
• displays measurement results
and transfers them via interfaces.
Brief device description
Install the UMG 96-S2 in the weather-protected
front panel of switching cabinets.
Cut-out size:
92
+0.8
x 92
+0.8
mm
Please ensure the following:
Sufficient ventilation
• Observe the clearance to
adjacent components.
• Can be installed in any
position.
Fig. Installation position
rear view of UMG 96-S2
Assembly Connecting the supply voltage
The supply voltage level for your device is specified
on the rating plate.
After connecting the supply voltage, a display
appears. If no display appears, check whether
the supply voltage is within the rated voltage range.
N
L
User manual:
Disclaimer
It is essential that the information products
for the devices are observed to ensure
safe operation and achieve the specified
performance characteristics and product
features. Janitza electronics GmbH assumes no
liability for personal injuries, property damage
and financial losses resulting from the failure to
observe the information products.
Make sure that your information products are
legible and accessible.
Further documentation can be found on our
web site www.janitza.com under Support >
Downloads.
Copyright notice
© 2018 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing,
distribution and any other kind of use, even
in part, is prohibited.
Subject to technical changes.
• Make sure that the installation instructions
match your device.
• First, make sure you have read and understood
the document accompanying the product.
• Keep the documents accompanying
the product accessible through its service
life and hand them over to the subsequent
owner where applicable.
• Please refer to www.janitza.com for information
concerning device revisions and the associated
adjustments to the documentation accompanying
the product.
Disposal
Please observe the national regulations.
Dispose of individual parts, where necessary,
depending on the properties and existing
country-specific regulations, e.g. as:
• Electronic waste
• Plastic
• Metal
or commission a certified disposal company
with the scrapping.
Relevant laws,
applied standards and directives
Please refer to the Declaration of Conformity
on our web site (www.janitza.com) for the
laws, standards and directives applied by
Janitza electronics GmbH.
NOTE
Points out procedures during which a danger
of injuries or property damage does
not
exist.
ATTENTION
Indicates an imminently dangerous situation that
can result in property damage or environmental
damage in the event of noncompliance.
CAUTION
Indicates a potentially dangerous situation
that can result in minor injuries or property
damage.
WARNING
Indicates a potentially dangerous situation
that can result in serious injuries or death.
DANGER
Indicates an imminent danger that will result
in serious and/or fatal injuries.
ATTENTION
Noncompliance with the assembly instructions
can damage or destroy your device.
Ensure sufficient air circulation in your installation
environment and, where applicable, sufficient
cooling with high ambient temperatures.
NOTE
You can find more detailed information about
the device functions, data and assembly
in the user manual.
WARNING
Risk of injury due to defective devices.
Devices, which may have possibly been
damaged due to an improper use, can
no longer fulfill the safety regulations and
represent a risk of injury.
Shut down the device immediately
and secure it against inadvertent
commissioning if the device:
• has visible damage,
• no longer functions despite an intact
power supply,
• was exposed to a prolonged period
of unfavorable conditions
or transport stresses. DANGER
Risk of injury due to electric voltage!
It may result in serious bodily harm or death due to:
• Touching live exposed or stripped cores.
• Device inputs that are dangerous to touch.
Before starting work, disconnect your system
from the power supply. Verify that there
is no current.
ATTENTION
Noncompliance of the connection conditions
or exceeding the permissible voltage range
can damage or destroy your device.
Before you connect the device to the supply
voltage, please observe the following:
• The voltage and frequency must comply
with the specifications on the rating
plate. Observe the limit values as
described in the user manual.
• In building installations, secure
the supply voltage with a UL/IEC-listed
circuit breaker/fuse.
•
The circuit breaker
-
must be easily accessible
for the user and located in the vicinity
of the device.
- must be labeled for the respective
device.
• Do not tap the supply voltage at
the voltage transformers.
• Provide a fuse for the neutral conductor
if the neutral conductor connection
is not grounded to the source.
Fuse
Fig. supply voltage connection.
Circuit breaker
Fig. supply voltage connection.
8 5 6
The device
• is only approved for a current measurement
using the current transformer.
• is designed for the connection of current
transformers with secondary currents
of ../1 A and ../5 A.
• has the current transformer ratio set to 5/5 A
by default.
7
Voltage measurement
The device has 3 voltage inputs and is suitable
for different connection versions.
10 9
Network systems
Suitable network systems and maximum nominal voltages (DIN EN 61010-1/A1):
Circuit breaker
Fuse (UL/IEC-listed)
L2
L3
N
L1
“Direct voltage measurement in a three-phase
4-conductor system” connection version
Voltage measurement connection versions
Load
Current measurement I1, I2, I3 Current measurement connection versions I1, I2, I3
The voltage measurement inputs are designed
for measurements in the low-voltage networks
in which nominal voltages occur up to
• 230 V phase to ground and 400 V phase to
phase in the 4-conductor system or
• 400 V phase to phase in the 3-conductor
system.
The rated voltages and surge voltages correspond
to overvoltage category 300 V CATIII.
Establishing the connection to the PC
The most common connection for the communication
between the PC and device:
Fig. Rear of UMG 96-S2
Three-phase 4-conductor systems
with grounded neutral conductor
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
IEC U
L-N
/ U
L-L:
230 V
LN
/ 400 V
LL
The device can be used
• in TN and TT networks
• residential and industrial sectors.
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Voltage measurement in the three-
phase 4-conductor system
Voltage measurement in the single-
phase 3-conductor system
V 1 V
2
V
3
V N
V 1 V
2
V 3 V N
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Current measurement via
the current transformer in the three-
phase 4-conductor system
Current measurement
in the single-phase 3-conductor
system
Three-phase 4-conductor
systems
Current measurement via 2
current transformers in the three-
phase 4-conductor system
1.
(gedrehtes Patchkabel)
PC
RS232 RS232
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
2.
Ethernet
(gedrehtes Patchkabel)
PC UMG 604
Device connection via a UMG 604 as
a gateway.
UMG 96-S2
UMG 96 S2
RS485
RS485
3.
(gedrehtes Patchkabel)
PC
USB USB
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
CAUTION
Risk of injury or damage to device.
Noncompliance with the connection
conditions for the voltage measurement inputs
can injure you or damage the device.
Therefore, please note the following:
• The voltage measurement inputs
- must not be connected to DC current.
- must be provided with a suitable,
labeled fuse and circuit breaker
(alternative: miniature circuit breaker)
in their immediate vicinity.
- are dangerous to touch.
•
Voltages that exceed the allowed
nominal network voltages must be
connected via voltage transformers.
• Measured voltages and measured
currents must originate from the same
network.
NOTE
You can easily configure the
voltage
transformer ratios
via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios
and their setting in the user manual.
WARNING
Risk of injury due to electric voltage!
It may result in serious bodily harm or death
due to:
• Touching live exposed or stripped cores.
• Device and current transformer inputs that
are dangerous to touch.
Before starting work, disconnect your
system from the power supply. Verify that
there is no current.
Ground the system. Use the ground
connection point with the ground symbol
for this. Also ground the secondary
windings of current transformers and all
metal parts of the transformer accessible
to contact!
WARNING
Risk of injury due to high currents and high
electrical voltages!
Open current transformers that are operated
on the secondary side (high voltage spikes) can
result in serious bodily harm or even death.
Avoid the open operation of the current
transformers. Overloaded transformers short circuit!
NOTE
You can easily configure the current
transformer ratios
via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios and
their setting in the user manual.
Connection
“Current measurement via current transformer”
15 13
Programming the parameters Operation and button functions
Example: PC connection via RS485 interface and UMG 604 as the gateway 12 14
1. Switch into programming mode.
2. The symbols
PRG
for the programming mode
and
CT
for the current transformer appear.
3. Switch into programming mode for
the parameter list by pressing key 2 twice.
4. The input area for the parameter list appears.
5. Confirm with key 1 - the first number of
the parameter address flashes.
6. Select the value of the 1st number using key 2 .
7. Continue the procedure for the next
numbers of the parameter address and for
the parameter settings.
8. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch back
to the input area for the current transformer
using key 2.
Setting the device address (parameter address 000)
A master device can distinguish the UMGs based
on the device address in a master/slave network
via the RS485 interface.
For devices within this network, make sure that
for each parameter address 000
• different device addresses are assigned.
• the parameter setting of parameter address 000
is within the range of 1 to 247 (0 and 248 to 255
are reserved).
Setting the baud rate (parameter address 001)
For each device in a master/slave network via
the RS485 interface:
• select a uniform baud rate (parameter address 001)
(0= 9.6 kbps, 2=19.2 kbps, 3=38.4 kbps).
• select the number of stop bits (parameter address
003) (0=1 bit, 1=2 bits, 2=even parity, 3=odd
parity).
Data bits (8) and parity (none) are set.
Parameter address
Programming mode
Parameter setting
Fig. “Parameter list”
input area
The operation of the device occurs via the keys 1
and 2 with following differences:
• briefly pressing (key 1 or 2):
next step (+1).
• long pressing (key 1 or 2):
previous step (-1).
The device distinguishes between display mode
and programming mode.
Display mode
• Page between the measured value displays
using keys 1 and 2.
• The measured value display shows up
to 3 measured values.
• A time for the automatic display change
between the measured value displays can
be configured in the GridVis® software.
Programming mode
• Hold down key 1 and 2 simultaneously for
1 second in order to switch between display
mode and programming mode . The text PRG
appears in the display.
• The settings necessary for the operation
of the device are configured in programming
mode.
Key 1
Key 2
Delivery
Average
CT: Current transformer
VT: Voltage transformer
K1: Output 1
Password
Outer conductor/
outer conductor
Summation measurement
Programming
mode
Minimum value, NT/delivery
• Programming mode can be protected with a user
password.
• Switch between the programming menus using key 2:
1. Current transformer
2. Voltage transformer
3. Parameter list
To switch from programming mode into display mode ,
• press keys 1 and 2 simultaneously for 1 s.
• Do not press any keys for 60 s (automatic).
Programming the current transformer
1. Switch into programming mode.
2. The symbols
PRG for the programming mode
and CT for the current transformer appear.
3. Confirm with key 1 - the first number of
the input area for the primary current flashes.
4. Select the value of the 1st number using key 2 .
5. Switch to the 2nd number using key 1 .
6. Select the value of the 2nd number with key 2 .
7. Switch to the 3rd number using key 1 .
8. Select the value of the 3rd number using key 2 .
9. Confirm using key 1.
10. The complete number flashes.
11. Select the decimal place and therefore
the unit of the primary current using key 2.
12. Confirm using key 1.
13. The input area for the secondary current
flashes.
14. Set the secondary current (value 1 A or 5 A)
using key 2.
15. Confirm using key 1.
16. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch
to the input area for the voltage transformer
using key 2.
Current transformer
symbol
Unit display
Current transformer,
primary
Programming mode
Current transformer,
secondary
Fig. “Current transformer” input area
Programming the voltage transformer
1. Switch into programming mode.
2. The symbols
PRG for the programming
mode and CT for the current transformer
appear.
3. Switch into programming mode for
the voltage transformer using key 2.
4. The symbols PRG for the programming mode
and VT for the voltage transformer appear.
5. Confirm with key 1 - the first number of
the input area for the primary voltage flashes.
6. Select the value of the 1st number using key 2 .
7. Switch to the 2nd number using key 1 .
8. Select the value of the 2nd number with key 2 .
9. Switch to the 3rd number using key 1 .
10. Select the value of the 3rd number using key 2 .
11. Confirm using key 1.
12. The complete number flashes.
13. Select the decimal place and therefore
the unit of the primary voltage using key 2.
14. Confirm using key 1.
15. The input area for the secondary voltage
flashes.
16. Set the secondary voltage using key 2.
17. Confirm using key 1.
18. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch into
programming mode for the parameter list
using key 2.
Unit display
Voltage transformer,
primary
Programming mode
Voltage transformer,
secondary
Voltage transformer
symbol
Fig. “Voltage transformer” input area
11
Correct
Terminal strip (switching cabinet) .
Device with RS485 interface
(without termination resistor).
Incorrect
Device with RS485 interface
(termination resistor on
the device).
RS485 bus structure
• Connect all devices in the RS485 bus structure
(line) according to the master/slave principle.
• A segment of a RS485 bus structure
can contain up to 32 participants/devices.
• Terminate the cable with termination resistors
(120 Ω, 0.25 W) at the beginning and end of
a segment. The UMG 96-S2 does not contain
a termination resistor.
• With more than 32 participants, use repeaters
to connect segments.
NOTE
Changes only become active after exiting
programming mode.
NOTE
Next, the most important programming
menus for a quick start,
Current transformer,
Voltage transformer and Parameter list ,
are explained.
Further information about the operation,
displays and key functions of your device
can be found in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the current transformers
and current transformer ratios can be found
in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the voltage transformers
and voltage transformer ratios can be found in
the user manual.
NOTE
• A comprehensive parameter list with setting
ranges and default settings can be found
in the user manual or the Modbus address list
on our web site.
• The parameter addresses for the device
address (000) and the baud rate (001) are
explained next. NOTE
For the integration of the UMG 96-S2 into an
RS485 bus structure (master/slave principle)
with UMG 604 as the master device, first
• enter a 1 (Modbus RTU/master) in Address
203 of the UMG 604!
15 13
www
.janitza.com
Doc no. 2.062.010.1d
10/2018
Item no. 33.03.372
Max. value HT/reference
S1 S2
S1 S2
S1 S2
L2
L3
N
L1
Programming the parameters
Example: PC connection via RS485 interface and UMG 604 as the gateway
Operation and button functions
NOTE
Further information on the parameter lists, de-
vice addresses and baud rates can be found
in the user manual.
The UMG 96-S2 communicates with a PC
via the serial RS485 interface and a UMG 604
as a gateway:
Connection of
further slave
devices
data GND
A
B
C
RS485 Bus
A
B
Functional ground
Connection
to the
UMG 604
as gateway
(master)
data GND
NOTE
To prevent the addition of residual current when
using several devices, mount the data GND as
a functional ground (see fig. on the left)!
C
www
.janitza.de
Doc no. 2.062.010.0
04/2018
Item no. 33.03.
xxx
You can find more detailed information about the
device configuration and communication starting
in step 11.
NOTE
Alternatively to the fuse and circuit breaker, a
miniature circuit breaker can also be used.
16 17
Technical data
Voltage measurement
Three-phase 4-conductor
systems with nominal
voltages up to
230 V/400 V (+-10%) according
to IEC
Overvoltage category 300 V CAT III
Rated surge voltage 4 kV
Fuse for the voltage
measurement 1 - 10 A
(with IEC/UL approval)
Measuring range L-N
0
1)
.. 300 Vrms
(max. overvoltage 400 Vrms)
Measuring range L-L
0
1)
.. 425 Vrms
(max. overvoltage 620 Vrms)
Limit value for the
measuring range overflow
U L-N
> 300 Vrms
Resolution 0.01 V
Crest factor
1.9 (related to the measurement
range)
Impedance 3 MΩ/phase
Power consumption Approx. 0.1 VA
Sampling frequency 8 kHz
Frequency of the
basic oscillation
- resolution
45 Hz .. 65 Hz
0.01 Hz
1) The device only determines the measured values if voltage
L1-N is greater than 20 Veff (4-conductor measurement)
or voltage L1-L2 is greater than 34 Veff (3-conductor
measurement) on voltage measurement input V1.
Current measurement
Rated current x/1 and x/5 A
Measuring range 0 .. 6 Arms
Limit value for the measuring
range overflow I
> 7 Aeff
Crest factor (based on the
rated current)
2
Resolution 1 mA (display 0.01 A)
Overvoltage category 300 V CAT II
Rated surge voltage 2 kV
Power consumption approx. 0.2 VA (Ri=5 mΩ)
Overload for 1 s 60 A (sinusoidal)
Sampling frequency 8 kHz
Supply voltage
Nominal range
230 V :
AC 90 V - 265 V (50/60 Hz) or
DC 90 V - 250 V, 300 V CATIII
Operating range +-10% of nominal range
Power consumption 230 V : max. 1.5 VA / 0.5 W
Internal fuse,
not exchangeable Type T1A / 250 VDC / 277 VAC
according to IEC 60127
Recommended overcur-
rent protection device for
the line protection 230 V : 6-16 A
(Char. B)
(IEC-/UL approval)
General information
Net weight (with attached
connectors)
Approx. 250 g
Packaging weight (including
accessories)
Approx. 500 g
Impact resistance IK07 according to IEC 62262
Transport and storage
The following information applies to devices which are
transported or stored in the original packaging.
Free fall
1 m
Temperature K55 (-25 °C up to +70 °C)
Relative humidity 0 to 90% RH
Ambient conditions during operation
Use the UMG 96-S2 in a weather-protected, stationary application.
Protection class II in accordance with IEC 60536 (VDE 0106, Part 1).
Operating temperature
range
K55 (-10° C .. +55° C)
Relative humidity 0 to 75% RH
Operating altitude 0 .. 2000 m above sea level
Degree of pollution 2
Installation position discretionary
Ventilation
No external ventilation
required
Protection against
foreign bodies and water
- Front
- Rear
- Front side with sealing
IP40 i.a.w. EN60529
IP20 i.a.w. EN60529
IP54 i.a.w. EN60529
Digital outputs
1 digital output, semiconductor relay, not short-circuit proof.
Switching voltage
max. 60 V DC
Switching current max. 50 mAeff DC
Pulse output (energy pulse) Max. 12.5 Hz
Serial interface
RS485 - Modbus RTU/slave
9.6 kbps, 19.2 kbps,
38.4 kbps
Stripping length 7 mm
Terminal connection capacity (supply voltage)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm
2
, AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (digital interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 -16
Terminal pins, core end sheath 0.2 - 1.5 mm 2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (current measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm
2
, AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Terminal connection capacity (serial interface)
Single core, multi-core,
fine-stranded
0.2 - 1.5 mm 2 , AWG 28 - 16
Terminal pins, core end sheath 0.2 - 1.5 mm 2
Tightening torque 0.2 - 0.25 Nm
Stripping length 7 mm
Terminal connection capacity (voltage measurement)
Connectable conductors.
Only one conductor can be connected per terminal.
Single core, multi-core,
fine-stranded
0.08 - 2.5 mm
2
, AWG 28-12
Terminal pins, core end sheath 0.2 - 2.5 mm 2
Tightening torque 0.4 - 0.5 Nm
Stripping length 7 mm
Procedure in the event of errors
Possible error Cause Remedy
No display
External fuse for the power supply voltage has
tripped.
Replace fuse.
No current display
Measured voltage is not connected. Connect the measured voltage.
Measurement current is not connected. Connect measurement current.
Current displayed is too large
or too small.
Current measurement in the wrong phase. Check connection and correct if necessary.
Current transformer factor is incorrectly programmed. Read out and program the current transformer
transformation ratio at the current transformer.
Current harmonics exceed the current peak value at
the measurement input
Install current transformer with a larger CT ratio.
The current at the measurement input was not
achieved.
Install current transformer with a smaller current
transformer ratio.
Voltage displayed is too large
or too small.
Measurement in the wrong phase. Check connection and correct if necessary.
Voltage transformer incorrectly programmed.
Read out and program the voltage transformer ratio
at the voltage transformer.
Voltage displayed is too
small.
Measurement range exceeded. Install voltage transformers.
The peak voltage value at the measurement input has
been exceeded by harmonic components.
Attention!
Ensure the measurement inputs are not
overloaded.
Active power is too large or
too small. *
The programmed voltage transformer transmission
ratio is incorrect
Read the current transformer transmission ratio on
the current transformer and program it in the GridVis
software.
A current path is assigned to the wrong voltage path. Check connection and correct if necessary (GridVis).
The programmed voltage transformer transmission
ratio is incorrect
Read the voltage transformer transmission ratio on
the voltage transformer and program it in the GridVis
software.
Possible error Cause Remedy
Active power reference/deliv-
ery is reversed.
At least one current transformer connection is
reversed.
Check connection and correct if necessary (GridVis).
A current path is assigned to the wrong voltage path.
No connection to the device
RS485: Device address incorrect or incorrect
protocol
Set device address / select protocol
"EE" in the display See “Error messages” in the user manual.
Device still does not work
despite the above measures.
Device defective.
Send the device to the manufacturer for inspection
and testing.
NOTE
More technical data can be found in the device
user manual.
NOTE
Property damage due to overloaded measurement inputs!
Too high current and voltage values overload the measurement inputs.
Observe the limit values specified on the rating plate and in the user manual!
General information
1 2
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
Fax +49 6441 9642-30
E-mail: info@janitza.de
www.janitza.com
Energy Analyser
UMG 96-S2
Installation instructions

Installation

Device settings
German version:
see r
ear side
3 4 2
Safety
Safety instructions
The installation instructions do not include
a complete list of all safety measures necessary
for operating the device.
Special operating conditions may require
additional measures. The installation
instructions contain notes that must be
observed for your personal safety and to
prevent property damage.
Used symbols:
The additional symbol
on the device itself indicates
an electrical danger that can
result in serious injuries or death.
The general warning symbol calls
attention to possible risks of
injury. Observe all the instructions
listed under this symbol in order
to prevent injuries or even death.
Safety instructions are highlighted by a warning
triangle and are presented as follows depending
on the level of risk:
Safety measures
When operating electrical devices, specific parts
of these devices inevitably carry dangerous
voltage. As a result, serious bodily harm or
property damage can occur if they are not
handled correctly:
• Before connecting the device, ground it at
the protective conductor terminal if available.
• Dangerous voltages may be present in all
circuit parts connected to the voltage supply.
• There may still be dangerous voltages present
in the device even after it is disconnected
from the supply voltage (capacitor storage).
• Do not operate operating equipment
with open current transformer circuits.
• Do not exceed the limit values specified
in the user manual and on the rating
plate. This must also be observed during
inspections and commissioning.
• Observe the safety instructions and warning
notices in the documents that accompany
the devices.
Qualified personnel
To prevent personal injuries and property
damage, only qualified personnel with electrical
engineering training may work on the device.
They must also have knowledge
• Of the national accident prevention regulations
• In safety technology standards
• In the installation, commissioning and
operation of the device.
Intended use
The device is
• intended for installation in switching cabinets
and small installation distributors. The device
can be installed in any mounting position
(please observe section 3 “Assembly”).
• not intended for installation in vehicles! Using
the device in mobile equipment is considered
an unusual environmental condition and is
only permissible by special agreement.
• not intended for installation in areas exposed
to harmful oils, acids, gases, vapors, dust
and radiation, etc.
The prerequisites for smooth and safe operation
of the device include proper transport, storage,
setup and assembly, as well as proper operation
and maintenance.
The UMG 96-S2 is a power analyzer that:
• measures and calculates electrical
parameters, such as voltage, current,
frequency, power, work, harmonics
(up to the 15th, odd), etc. in building
installations, on distribution units, circuit
breakers and busbar trunking systems.
• displays measurement results
and transfers them via interfaces.
Brief device description
Install the UMG 96-S2 in the weather-protected
front panel of switching cabinets.
Cut-out size:
92
+0.8 x 92 +0.8 mm
Please ensure the following:
Sufficient ventilation
• Observe the clearance to
adjacent components.
• Can be installed in any
position.
Fig. Installation position
rear view of UMG 96-S2
Assembly Connecting the supply voltage
The supply voltage level for your device is specified
on the rating plate.
After connecting the supply voltage, a display
appears. If no display appears, check whether
the supply voltage is within the rated voltage range.
N
L
User manual:
Disclaimer
It is essential that the information products
for the devices are observed to ensure
safe operation and achieve the specified
performance characteristics and product
features. Janitza electronics GmbH assumes no
liability for personal injuries, property damage
and financial losses resulting from the failure to
observe the information products.
Make sure that your information products are
legible and accessible.
Further documentation can be found on our
web site www.janitza.com under Support >
Downloads.
Copyright notice
© 2018 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing,
distribution and any other kind of use, even
in part, is prohibited.
Subject to technical changes.
• Make sure that the installation instructions
match your device.
• First, make sure you have read and understood
the document accompanying the product.
• Keep the documents accompanying
the product accessible through its service
life and hand them over to the subsequent
owner where applicable.
• Please refer to www.janitza.com for information
concerning device revisions and the associated
adjustments to the documentation accompanying
the product.
Disposal
Please observe the national regulations.
Dispose of individual parts, where necessary,
depending on the properties and existing
country-specific regulations, e.g. as:
• Electronic waste
• Plastic
• Metal
or commission a certified disposal company
with the scrapping.
Relevant laws,
applied standards and directives
Please refer to the Declaration of Conformity
on our web site (www.janitza.com) for the
laws, standards and directives applied by
Janitza electronics GmbH.
NOTE
Points out procedures during which a danger
of injuries or property damage does
not exist.
ATTENTION
Indicates an imminently dangerous situation that
can result in property damage or environmental
damage in the event of noncompliance.
CAUTION
Indicates a potentially dangerous situation
that can result in minor injuries or property
damage.
WARNING
Indicates a potentially dangerous situation
that can result in serious injuries or death.
DANGER
Indicates an imminent danger that will result
in serious and/or fatal injuries.
ATTENTION
Noncompliance with the assembly instructions
can damage or destroy your device.
Ensure sufficient air circulation in your installation
environment and, where applicable, sufficient
cooling with high ambient temperatures.
NOTE
You can find more detailed information about
the device functions, data and assembly
in the user manual.
WARNING
Risk of injury due to defective devices.
Devices, which may have possibly been
damaged due to an improper use, can
no longer fulfill the safety regulations and
represent a risk of injury.
Shut down the device immediately
and secure it against inadvertent
commissioning if the device:
• has visible damage,
• no longer functions despite an intact
power supply,
• was exposed to a prolonged period
of unfavorable conditions
or transport stresses. DANGER
Risk of injury due to electric voltage!
It may result in serious bodily harm or death due to:
• Touching live exposed or stripped cores.
• Device inputs that are dangerous to touch.
Before starting work, disconnect your system
from the power supply. Verify that there
is no current.
ATTENTION
Noncompliance of the connection conditions
or exceeding the permissible voltage range
can damage or destroy your device.
Before you connect the device to the supply
voltage, please observe the following:
• The voltage and frequency must comply
with the specifications on the rating
plate. Observe the limit values as
described in the user manual.
• In building installations, secure
the supply voltage with a UL/IEC-listed
circuit breaker/fuse.
• The circuit breaker
- must be easily accessible
for the user and located in the vicinity
of the device.
- must be labeled for the respective
device.
• Do not tap the supply voltage at
the voltage transformers.
• Provide a fuse for the neutral conductor
if the neutral conductor connection
is not grounded to the source.
Fuse
Fig. supply voltage connection.
Circuit breaker
Fig. supply voltage connection.
8 5 6
The device
• is only approved for a current measurement
using the current transformer.
• is designed for the connection of current
transformers with secondary currents
of ../1 A and ../5 A.
• has the current transformer ratio set to 5/5 A
by default.
7
Voltage measurement
The device has 3 voltage inputs and is suitable
for different connection versions.
10 9
Network systems
Suitable network systems and maximum nominal voltages (DIN EN 61010-1/A1):
Circuit breaker
Fuse (UL/IEC-listed)
L2
L3
N
L1
“Direct voltage measurement in a three-phase
4-conductor system” connection version
Voltage measurement connection versions
Load
Current measurement I1, I2, I3 Current measurement connection versions I1, I2, I3
The voltage measurement inputs are designed
for measurements in the low-voltage networks
in which nominal voltages occur up to
• 230 V phase to ground and 400 V phase to
phase in the 4-conductor system or
• 400 V phase to phase in the 3-conductor
system.
The rated voltages and surge voltages correspond
to overvoltage category 300 V CATIII.
Establishing the connection to the PC
The most common connection for the communication
between the PC and device:
Fig. Rear of UMG 96-S2
Three-phase 4-conductor systems
with grounded neutral conductor
L1
L2
L3
E
E
N
E
L1
L2
L3
E
N
R
L1
L2
L3
E
E
L1
L2
E
E
L
N
E
E
L1
L2
L3
E
E
L1
L2
N
E E
IEC U
L-N
/ U
L-L:
230 V
LN
/ 400 V
LL
The device can be used
• in TN and TT networks
• residential and industrial sectors.
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Voltage measurement in the three-
phase 4-conductor system
Voltage measurement in the single-
phase 3-conductor system
V 1 V 2 V 3 V N
V 1 V 2 V 3 V N
Three-phase 4-conductor
systems
Single phase 3-conductor
systems
Current measurement via
the current transformer in the three-
phase 4-conductor system
Current measurement
in the single-phase 3-conductor
system
Three-phase 4-conductor
systems
Current measurement via 2
current transformers in the three-
phase 4-conductor system
1.
(gedrehtes Patchkabel)
PC
RS232 RS232
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
2.
Ethernet
(gedrehtes Patchkabel)
PC
UMG 604
Device connection via a UMG 604 as
a gateway.
UMG 96-S2
UMG 96 S2
RS485
RS485
3.
(gedrehtes Patchkabel)
PC
USB USB
RS485
UMG 96-S2
UMG 96-S2
Device connection via interface
converter.
RS485
RS485
CAUTION
Risk of injury or damage to device.
Noncompliance with the connection
conditions for the voltage measurement inputs
can injure you or damage the device.
Therefore, please note the following:
• The voltage measurement inputs
- must not be connected to DC current.
- must be provided with a suitable,
labeled fuse and circuit breaker
(alternative: miniature circuit breaker)
in their immediate vicinity.
-
are dangerous to touch.
• Voltages that exceed the allowed
nominal network voltages must be
connected via voltage transformers.
• Measured voltages and measured
currents must originate from the same
network.
NOTE
You can easily configure the voltage
transformer ratios via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios
and their setting in the user manual.
WARNING
Risk of injury due to electric voltage!
It may result in serious bodily harm or death
due to:
• Touching live exposed or stripped cores.
• Device and current transformer inputs that
are dangerous to touch.
Before starting work, disconnect your
system from the power supply. Verify that
there is no current.
Ground the system. Use the ground
connection point with the ground symbol
for this. Also ground the secondary
windings of current transformers and all
metal parts of the transformer accessible
to contact!
WARNING
Risk of injury due to high currents and high
electrical voltages!
Open current transformers that are operated
on the secondary side (high voltage spikes) can
result in serious bodily harm or even death.
Avoid the open operation of the current
transformers. Overloaded transformers short circuit!
NOTE
You can easily configure the current
transformer ratios via
• the device menu.
• the GridVis® software.
You can find more detailed information about
the current and voltage transformer ratios and
their setting in the user manual.
Connection
“Current measurement via current transformer”
15 13
Programming the parameters Operation and button functions Example: PC connection via RS485 interface and UMG 604 as the gateway
12 14
1. Switch into programming mode.
2. The symbols
PRG for the programming mode
and CT for the current transformer appear.
3. Switch into programming mode for
the parameter list by pressing key 2 twice.
4. The input area for the parameter list appears.
5. Confirm with key 1 - the first number of
the parameter address flashes.
6. Select the value of the 1st number using key 2 .
7. Continue the procedure for the next
numbers of the parameter address and for
the parameter settings.
8. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch back
to the input area for the current transformer
using key 2.
Setting the device address (parameter address 000)
A master device can distinguish the UMGs based
on the device address in a master/slave network
via the RS485 interface.
For devices within this network, make sure that
for each parameter address 000
• different device addresses are assigned.
• the parameter setting of parameter address 000
is within the range of 1 to 247 (0 and 248 to 255
are reserved).
Setting the baud rate (parameter address 001)
For each device in a master/slave network via
the RS485 interface:
• select a uniform baud rate (parameter address 001)
(0= 9.6 kbps, 2=19.2 kbps, 3=38.4 kbps).
• select the number of stop bits (parameter address
003) (0=1 bit, 1=2 bits, 2=even parity, 3=odd
parity).
Data bits (8) and parity (none) are set.
Parameter address
Programming mode
Parameter setting
Fig. “Parameter list”
input area
The operation of the device occurs via the keys 1
and 2 with following differences:
• briefly pressing (key 1 or 2):
next step (+1).
• long pressing (key 1 or 2):
previous step (-1).
The device distinguishes between display mode
and programming mode.
Display mode
• Page between the measured value displays
using keys 1 and 2.
• The measured value display shows up
to 3 measured values.
• A time for the automatic display change
between the measured value displays can
be configured in the GridVis® software.
Programming mode
• Hold down key 1 and 2 simultaneously for
1 second in order to switch between display
mode and programming mode . The text
PRG
appears in the display.
• The settings necessary for the operation
of the device are configured in programming
mode.
Key 1
Key 2
Delivery
Average
CT: Current transformer
VT: Voltage transformer
K1: Output 1
Password
Outer conductor/
outer conductor
Summation measurement
Programming
mode
Minimum value, NT/delivery
• Programming mode can be protected with a user
password.
• Switch between the programming menus using key 2:
1. Current transformer
2. Voltage transformer
3. Parameter list
To switch from programming mode into display mode ,
• press keys 1 and 2 simultaneously for 1 s.
• Do not press any keys for 60 s (automatic).
Programming the current transformer
1. Switch into programming mode.
2. The symbols
PRG
for the programming mode
and
CT
for the current transformer appear.
3. Confirm with key 1 - the first number of
the input area for the primary current flashes.
4. Select the value of the 1st number using key 2 .
5. Switch to the 2nd number using key 1 .
6. Select the value of the 2nd number with key 2 .
7. Switch to the 3rd number using key 1 .
8. Select the value of the 3rd number using key 2 .
9. Confirm using key 1.
10. The complete number flashes.
11. Select the decimal place and therefore
the unit of the primary current using key 2.
12. Confirm using key 1.
13. The input area for the secondary current
flashes.
14. Set the secondary current (value 1 A or 5 A)
using key 2.
15. Confirm using key 1.
16. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch
to the input area for the voltage transformer
using key 2.
Current transformer
symbol
Unit display
Current transformer,
primary
Programming mode
Current transformer,
secondary
Fig. “Current transformer” input area
Programming the voltage transformer
1. Switch into programming mode.
2. The symbols
PRG
for the programming
mode and
CT
for the current transformer
appear.
3. Switch into programming mode for
the voltage transformer using key 2.
4. The symbols PRG for the programming mode
and VT for the voltage transformer appear.
5. Confirm with key 1 - the first number of
the input area for the primary voltage flashes.
6. Select the value of the 1st number using key 2 .
7. Switch to the 2nd number using key 1 .
8. Select the value of the 2nd number with key 2 .
9. Switch to the 3rd number using key 1 .
10. Select the value of the 3rd number using key 2 .
11. Confirm using key 1.
12. The complete number flashes.
13. Select the decimal place and therefore
the unit of the primary voltage using key 2.
14. Confirm using key 1.
15. The input area for the secondary voltage
flashes.
16. Set the secondary voltage using key 2.
17. Confirm using key 1.
18. Exit programming mode by simultaneously
pressing key 1 and 2 (1 s). Switch into
programming mode for the parameter list
using key 2.
Unit display
Voltage transformer,
primary
Programming mode
Voltage transformer,
secondary
Voltage transformer
symbol
Fig. “Voltage transformer” input area
11
Correct
Terminal strip (switching cabinet) .
Device with RS485 interface
(without termination resistor).
Incorrect
Device with RS485 interface
(termination resistor on
the device).
RS485 bus structure
• Connect all devices in the RS485 bus structure
(line) according to the master/slave principle.
• A segment of a RS485 bus structure
can contain up to 32 participants/devices.
• Terminate the cable with termination resistors
(120 Ω, 0.25 W) at the beginning and end of
a segment. The UMG 96-S2 does not contain
a termination resistor.
• With more than 32 participants, use repeaters
to connect segments.
NOTE
Changes only become active after exiting
programming mode.
NOTE
Next, the most important programming
menus for a quick start,
Current transformer,
Voltage transformer and Parameter list ,
are explained.
Further information about the operation,
displays and key functions of your device
can be found in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the current transformers
and current transformer ratios can be found
in the user manual.
NOTE
Changes only become active after exiting
programming mode.
Further information on the voltage transformers
and voltage transformer ratios can be found in
the user manual.
NOTE
• A comprehensive parameter list with setting
ranges and default settings can be found
in the user manual or the Modbus address list
on our web site.
• The parameter addresses for the device
address (000) and the baud rate (001) are
explained next. NOTE
For the integration of the UMG 96-S2 into an
RS485 bus structure (master/slave principle)
with UMG 604 as the master device, first
• enter a 1 (Modbus RTU/master) in Address
203
of the UMG 604!
15 13
www
.janitza.com
Doc no. 2.062.010.1d
10/2018
Item no. 33.03.372
Max. value HT/reference
S1 S2
S1 S2
S1 S2
L2
L3
N
L1
Programming the parameters Example: PC connection via RS485 interface and UMG 604 as the gateway Operation and button functions
NOTE
Further information on the parameter lists, de-
vice addresses and baud rates can be found
in the user manual.
The UMG 96-S2 communicates with a PC
via the serial RS485 interface and a UMG 604
as a gateway:
Connection of
further slave
devices
data GND
A
B
C
RS485 Bus
A
B
Functional ground
Connection
to the
UMG 604
as gateway
(master)
data GND
NOTE
To prevent the addition of residual current when
using several devices, mount the data GND as
a functional ground (see fig. on the left)!
C