janitza UMG 512-Pro, User Manual And Technical Data

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UMG 512-PRO
6.1 Three-phase 3-conductor systems
The device is only suitable to a limited extent for
use in IT networks, since the measured voltage is
measured against the housing potential and the
input impedance of the device causes a leakage
current to ground. The leakage current can cause
the insulation monitoring in IT networks to re-
spond.
The connection variants with voltage transformers
are suitable for IT networks with no restrictions.
600 V 50/60 Hz
DC
AC/DC
L2
L3
Auxiliary supply
Voltage measurement
4M 4M 4M 4M
V1 V3 V2
4M
V4
Grounding of the
system
Impedance
L1
UMG 512-PRO
Vref
Fig. Schematic diagram, UMG in an IT network without
N.
6.2 Three-phase 4-conductor systems
The device can be used in three-phase 4-con-
ductor systems (TN, TT network) with a grounded
neutral conductor. The components of the electri-
cal system are grounded.
The voltage measurement in the device is de-
signed for the overvoltage category 600 V CAT III
(rated surge voltage 6 kV).
PE
347V/600V 50/60Hz
L2
L3
N
L1
N
L1
240 V
50/60Hz
Grounding
of the
system
DC
AC/DC
Auxiliary supply
Voltage measurement
4M
4M 4M 4M
V1 V3 V2 Vref
4M
V4
UMG 512-PRO
Fig. Schematic diagram, UMG in a TN network