Siemens Hicom 150 E Office Service Manual page 116

Hicom 150 E Office Rel.1.0 Service Manual - 3.3 Peripheral boards
The cable from the NT to Hicom 150 E OfficeCom should be kept as short as possible for
operating reasons.
Caution
No earth connection is permitted between Hicom 150 E OfficeCom and the NT. The
shields on the connection cable C39195-A7608-Cx should not be connected either on
the OfficeCom side or on the NT side.
Feeding
- The following applies to systems that are fed exclusively from the network (without USVC)
(see Figure 3-40):
The system must be fed via an external plug-type AC adapter (e.g. S30122-K5061-X).
The external plug-type AC adapter must be connected to the same network phase as the system
and the plug-type AC adapter's plus pole must be connected to the system earth.
- The following applies to systems that have an additional USVC (see
The NT must be fed via the -48 V (15 W max., please note the NT power requirement) of the
PSUC. This guarantees that NT power supply and connected S
interrupted in the event of a power failure.
Supplying NTs via S2M in the case of systems without USVC
Figure 3-46 Supplying NTs via S
Supplying NTs via S2M in the case of systems with USVC
Figure 3-47 Supplying NTs via S
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in the case of systems without USVC
2M
in the case of systems with USVC
2M
Figure 3-41):
line operation is not
2M