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UMG 509
Voltage measurement
Three-phase 4-conductor systems
The UMG 509 can be used in three-phase 4-conductor
systems (TN, TT networks) with an earthed neutral
conductor. The bodies of the electrical system are
earthed.
The voltage measurement in the UMG 509 is designed
for the overvoltage category 600V CAT III (measurement
voltage surge 6kV).
Three-phase 3-conductor systems
The UMG 509 is only suitable to a limited extent for
use in IT networks, since the measured voltage relative
to the housing potential is measured and the input
impedance of the device creates residual current against
the earth. The residual current can trigger the insulation
monitoring in IT networks.
The connection variants with voltage transformers are
suitable for unlimited use in IT networks.
PE
347V/600V 50/60Hz
L2
L3
N
L1
N
L1
240V
50/60Hz
System
earthing
DC
AC/DC
Auxilliary power
Voltage measurement
4M
4M
4M
4M
V1
V3V2 Vref
4M
V4
UMG 509
Fig. Schematic diagram, UMG 509 in a TN network.
Fig. Schematic diagram, UMG 509 in an IT network without N.
600V 50/60Hz
DC
AC/DC
L2
L3
Auxilliary power
Voltage measurement
4M
4M
4M
4M
V1
V3V2
4M
V4
Earthing of
the system
Impedance
L1
Vref
UMG 509
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