3
4
1
5
OPERATION
User Manual
LOADS CONTROL 3 RELAYS
Read all the instructions carefully
DIMENSIONS
INSTRUMENT DESCRIPTION
INSTALLATION
2
5.1
72
60
88
45
72
1
2
3
4.1
4.2
4
5
6
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
Alarm
PRG
PC3R
Out 1
Out 2
Out 3
ON OFF
ON OFF
ON OFF
Reset
PRG
PRG
PRG
PRG
PRG
PRG
PRG
PRG
PRG
PRG
PRG
PRG
PRG
connected load
disconnected load
absorbed power
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
connection
loads zone
disconnection
loads zone
delay ON
delay OFF
Time
delay OFF
Power
Setpoint - Hysteresis
Setpoint
Disconnection load 2 (the second one less priority)
Connection
load 2
Disconnection load 3 (less priority)
Vemer S.p.A.
I - 32032 Feltre (BL) • Via Camp Lonc, 16
Tel +39 0439 80638 • Fax +39 0439 80619
e-mail: [email protected] - web site: www.vemer.it
V3IS00703-011-062018
Mod.
PC3R
Red led: on if the absorbed power is higher than the setpoint
Keys increase/decrease
Key PRG: instrument programming/confirmation
- brief pressure = lower than 3 seconds
- long pressure = higher than 3 seconds
Data view display
4.1 Measured power
4.2 Segments for loads status indication
(connected = fixed on, disconnected = flashing)
Power supply terminals/inputs
Terminals 6-8: voltage input/instrument power supply
Terminals 8-9: current input (direct until 32A)
Relays terminals for loads connection
Electronic instrument to measure the consumption of active power in single-
phase systems to prevent the activation of the limiter switch of general
current for overload. For this reason, if the total absorbed power is higher than
the programmed activation threshold (setpoint), the PC3R provides for the
disconnection of one or more not priority loads.
It’s possible to control until 3 loads (or loads groups) through the command of
as many relays, to whom is assigned a priority which sets the order with whom
the loads are disconnected.
Code
Model
Description
VE467700
PC3R
Loads control 3 relays
SAFETY WARNINGS
During the installation and the operation of the instrument it’s necessary to
observe the following instructions:
1) The instrument must be installed by a qualified person by observing
scrupulously the connection diagrams.
2) The instrument must be installed and activated in compliance with current
electric systems standards.
3) After installation, inaccessibility to the connection terminals without appropriate
tools must be guaranteed.
4) Do not use the instrument for other purposes different from the one specified.
5) The instrument must be installed in a closed electrical panel adequately
protected.
6) In the power supply network a bipolar disconnection must be present.
7) A protection device against over-currents should be installed in the electrical
system, upstream of the device.
8) Before accessing the connection terminals, verify that the leads are not live.
9) Do not power on or connect the instrument if any part of it is damaged.
10) In case of malfunction do not perform repairs and contact immediately the
technical support.
11) The instrument can be used in environments with category of measurement III
and pollution degree 2, as per standards CEI EN 61010-1.
TECHNICAL CHARACTERISTICS
• Power supply: 230Vac (-15% ÷ +10%) 50/60 Hz
• Maximum own consumption: 8 VA
• Voltage input consumption: < 2,5VA
• Current input consumption: < 2,5VA
• Measurement precision: 2% full scale
• Direct current connection until 32A through shunt
• Maximum overload with maintenance of measurement accuracy: 40A
• Settable setpoint range: 1 ÷ 10 kW
• Settable hysteresis range: 0 ÷ 1 kW
• Output: 3 monostable relays with exchange contact 16A / 250Vac
• Blocks for cables with maximum section of 6 mm
2
• Operating temperature: -10°C ÷ +45°C
• Operating humidity: 10% ÷ 90% non condensing
• Storage temperature: -10°C ÷ +65°C
• Container: 4 modules din
• Protection degree: IP20 / IP51 (on the front panel)
• Insulation: reinforced between accessible parts (front panel) and all other terminals
• Type of actions: 1B
To prevent the disconnection of all loads downstream of the general counter, the
loads control PC3R must measure the same current of the energy meter.
For this reason the ideal position for the connection of the instrument is immediately
downstream of the general switch.
Four loads or groups of loads must be located and so divided:
•
Not disconnectable loads
, that is to say loads which can’t be disconnected and
that can’t be controlled by PC3R (even if their consumption must be measured by
PC3R to determine the total consumption)
•
Loads with high priority (priority 1)
, which can be disconnected only as a last
hypothesis to limit the power absorbed
•
Loads with medium priority (priority 2)
•
Loads with low priority (priority 3)
, which can be disconnected without
special problems and they will be disconnected for first if the absorbed power is
higher than the prefixed threshold.
Note:
PC3R can be used also as a generic controller of absorbed power by loads
under control by placing it upstream of the cable for power supply of loads
themselves.
Clearly with this second application it’s not possible to prevent the
disconnection of the general energy meter, because the absorptions of the
loads not controlled by PC3R are not counted.
OPERATION
The PC3R switches on with the disconnected loads; every DelayOn seconds one load
is connected (if the absorption conditions allow this).
During the normal operation the instrument shows the
measured power (expressed with two decimals) and relays
status (segment on fixed if connected load, flashing segment
if disconnected load).
The programmed setpoint can be showed for three seconds
by pressing the key .
Configuration relays (normally open
or normally closed) can be showed by
pressing the key and then the relays
priority. Each display is visible for 3
seconds.
The device reset can be performed by pressing simultaneously the keys and :
the loads are disconnected and then reconnected according to the set priority.
OPERATION LOGIC (T control≠0)
Attention: only a qualified person can modify this value!
With
T control
different from zero, for each connection or disconnection of
one load the PC3R calculates the consumption of the load itself, measuring the
difference between the absorbed power before and after.
This calculated consumption is valid for all next
T control
minutes, where the
PC3R connects the load if the following condition is verified:
Total absorbed power < Setpoint – hysteresis – C
PX
where C
PX
is the consumption of the load in question
Note:
If there are more disconnected loads it’s possible that the less priority load
verifies the connection condition before the most priority load. In this case
the less priority load is connected while another load with higher priority is
disconnected.
This condition that contrasts with the priorities assigned to the single
outputs ends in the following cases:
- if before the
T control
expiration the absorbed power is such to allow
the connection of the most priority load (eventually by disconnecting the
one less priority)
- if the
T control
time is expired. In this case for PC3R the estimated
consumptions are no longer true and it proceeds by disconnecting all
the loads and by connecting them one at a time according to the priority
(each
Delay On
seconds)
- if a reset is performed by pressing simultaneously the keys and .
In this case the loads are disconnected and then reconnected according
to the priority.
After
T control
minutes on the contrary, for PC3R the consumption of the load
Cpx is no longer reliable and so the condition to connect the load becomes:
Total absorbed power < Setpoint – hysteresis
which is the same we would have with
T control=0
.
In practice, if
T control
is different from 0, the insertion sequence doesn’t
respect necessarily the set priority but it will be such to maximise the number of
connected loads.
DEFINITION AND MODIFICATION OF OPERATION PARAMETERS
•
Setpoint
[kW] represents the activation threshold that is to say the maximum value of accepted consumption before the instrument provides for the disconnection of the
loads according to the priority.
•
Hysteresis
(or differential) [kW] represents the value to subtract from the setpoint to calculate the value under whom there is the insertion zone (that is to say the zone
where it’s possible to connect the loads eventually disconnected).
For example, if the setpoint = 3 Kw and differential = 0.5 kW the loads eventually disconnected can be connected if the value of measured absorbed power is lower than 2.5 kW.
•
Delay On
[seconds] represents the minimum time that must elapse from the last connection (or disconnection) of one load before connecting another one.
•
Delay Off
[seconds] represents the delay of disconnection, that is to say how long the absorbed power must result higher than the setpoint before the instrument disconnects one load.
•
T control
[minutes] represents how long the consumption of active power estimated for each load can be considered valid. For details see the box 5.1
To access the modification or the operation parameters display press the key .
REFERENCE STANDARDS
Compliance with Community Directives:
2014/35/EU (LVD) 2014/30/EU (EMCD)
is declared with reference to the following standards:
• EN 61010-1
• EN 61000-6-2 and 61000-6-3
Not
disconnectable
loads
Disconnectable
loads
with priority 1
Disconnectable
loads
with priority 2
Disconnectable
loads
with priority 3
OPERATION LOGIC (T control=0)
Setpoint modification
Values: 1 ÷ 10 kW
default = 3 kW
Hysteresis modification
Values: 0 ÷ 1 kW
default = 0 kW
Intervention time
modification
Values: 10 ÷ 999 s
default = 30 s
Disconnection time
modification
Values: 10 ÷ 999 s
defaul t= 30 s
T control modification
Values: 0 ÷ 999 min
default = 0 min
Example of valid connection
with priority and not modified
logic of relays operation
