janitza UMG 604, Operating Manual

Page: 26 / 80

26
UMG 604
c
c
Short-circuit current transformer con-
nections!
The secondary connections of the
current transformer must be short-
circuited to them first before the
current supply leads to the UMG604
are disconnected!
If a testing switch is available, which
automatically short circuits the current
transformer's secondary leads, it is
sufficient to place this in the “test”
position, provided the short-circuiters
have been tested first.
Open current transformer!
High hazardous live voltage peaks can
occur at current transformers which
are operated open on the secondary
side!
The winding insulation in “safe open
current transformers” is dimensioned
so that the current transformers can
be operated open. But these current
transformers are also hazardous live
if they are operated open.
Fig. 26.1 Example, current measurement via
additional ammeter.
Ammeter
If you not only want to measure the current
with the UMG604 but with an ammeter also,
the ammeter must be connected in series to
the UMG604.
UMG
S
2
I
S
1
Einspeisung
Supply Verbraucher
Consumer
A
(k)S
1
S
2
(l)
P
2
(L) (K)P
1