janitza UMG 806, User Manual And Technical Data

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UMG 806 www.janitza.com
7.4 Voltage measurement
The device has 4 voltage measurement inputs
(V
1
,V
2
, V
3
and V
N
) and is suitable for various con-
nection variants.
WARNING
Risk of injury or damage to the device due to
electrical voltage and improper connection!
Disregard of the conditions for the connections of
the voltage and current measurement inputs may
damage the device or cause serious injury or death.
Connecting the voltage lines to the current mea-
surement inputs also poses a fi re hazard!
Therefore, please abide by the following:
· Switch off your installation before commenc-
ing work! Secure it against being switched on!
Check to be sure it is de-energized! Ground
and short circuit! Cover or block off adjacent
live parts!
· Check the condition of the connections, in-
cluding the cabling, especially the connection
of the voltage and current measurement.
· Do not apply a DC voltage
- to the voltage measurement inputs.
- Equip the voltage measurement inputs with
a suitable, marked fuse and isolation device
(alternatively: line circuit breaker) located
nearby.
- The voltage measurement inputs are dan-
gerous to touch.
· Connect voltages that exceed the permissi-
ble nominal network voltages via a voltage
transformer.
· Measured voltages and currents must origi-
nate from the same network.
INFORMATION
As an alternative to the fuse and isolation device,
you can use a line circuit breaker.
L1
N
L3
L2
Load
Fuse
(UL/IEC listed)
Isolation device
Fig. Connection example for “voltage measurement”.
7.4.1 Overvoltage
The voltage measurement inputs are designed
for measurements in low-voltage networks in
which nominal voltages occur as described in the
chapter "Technical data".
Information on the rated surge voltages and
overvoltage categories can also be found in the
technical data.
7.4.2 Mains frequency
The device:
· Requires the mains frequency for the measure-
ment and calculation of measured values.
· Is suitable for measurement in networks in which
the fundamental oscillation of the voltage is in the
range from 45 Hz to 65 Hz.
· Requires a voltage at the voltage measurement
input for the automatic determination of the
mains frequency
· Calculates the sampling frequency of the voltage
and current measurement inputs from the mains
frequency.
INFORMATION
The device only determines measured values if
there is a voltage at the voltage measurement
input.
Use line protection with IEC/UL approval (1 - 10 A,
tripping characteristic B) as an overcurrent protec-
tive device for the voltage measurements.