18
UMG 103
m
c
S2
S1
L3
L1
L2
S2
S1
S2
S1
c
B
A
Current measurement
The UMG103 is designed for the con-
nection of current transformers with
secondary currents of ../1A and ../5A.
Only alternating currents, not direct
currents, can be measured.
Each current measurement input can
be permanently loaded with 6A or for
1 second with 100 A.
Current transformers, which are not
loaded on the secondary side can con-
duct dangerous contact voltages and
therefore must be short-circuited.
The current transformer ratio can be pro-
grammed via RS485 using the software
GridVis only.
The current transformer ratio is set to
5/5A in our factory and must be adapted
to the used current tranformers.
Earthing current transformers.
If a connection is provided for
earthing the secondary winding,
this must be connected with
earth.
Fig.18.1 Connection example, current
measurement via current transformer.
Important!
The UMG103 is not suitable
for the measurement of direct
voltages.
Loads
Important!
The current measurement inputs
are hazardous live!
