18
SICAM MMU 7KG9663, Product Information
E50417-B1050-C514-A2, Edition 04.2013
Before commissioning the device, check that all
connections are made properly.
Connect the protective conductor terminal H
to the
protective conductor of the switch panel or of the
control cabinet.
The secondary connections of interconnected current
transformers must be short-circuited at these before
you disconnect the power supply leads to the device.
Voltage measuring inputs:
In the case of a
direct
connection
and
transformer connection
, the device
has to be safeguarded with a
listed 10 A backup fuse
or a listed 10 A miniature circuit breaker. When using
voltage transformers, their secondary connections
must never be short-circuited!
Check the polarity and the phase assignment at the
instrument transformers.
Before commissioning the device, leave it in the final
operating room for at least 2 hours. This allows it to
reach room temperature and to prevent dampness and
condensation.
The following hint applies to SICAM MMU which are
equipped with voltage measuring inputs with voltage
divider:
You cannot connect SICAM MMU directly in IT net-
works because the measuring voltage is measured
against the PE connection 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 pick up. Make sure that the maximum
allowable voltage at the inputs of SICAM MMU to
NOTE
When performing electrical installations, you have to
observe the national and international regulations on
the erection of electrical power installations.