Installation; Installing The 15 V Auxiliary Submodule - Siemens S5-155U System Manual

4.5.3

Installation

Installing the 15 V auxiliary
submodule
System Manual
C79000-B8576-C199-03
To install the power supply unit, push it into the rack. Press it in
firmly until the front plate is at the rack. The spring pressure of the
contact elements must be overcome. Then tighten the two screws to
the left and right of the front plate in the rack. The protective
conductor jumper on the left must be permanently connected to the
front plate terminal and the central rack.
Caution
Power supply units may only be removed when no power is
applied.
When the power supply unit is pulled out, the connection between
backup battery and backplane bus is retained; the backup supply for
the modules is thus ensured.
The auxiliary submodule (see ordering information for order number)
may only be inserted when the power is off.
Remove the power supply unit, fit the 15 V auxiliary submodule at the
location shown in the following figure.
Connector
X1
Front Plate
6ES5 955-3NA12 Power Supply Unit
Connector
Trans-
former
AA
Space for
LL
Auxiliary Sub-
module
4
X2
BB
RR
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