Installation - Siemens S5-135U/155U System Manual

4.4.3

Installation

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.
Installing the 15 V The auxiliary submodule (see ordering information for order number) may
Auxiliary
only be inserted when the power is off.
Submodule
Remove the power supply unit, fit the 15 V auxiliary submodule at the
location shown in the following figure.
System Manual
C79000-G8576-C199-06
Central Controllers and Expansion Units Power Supply Units
Connector
X1
Front Plate
Connector
X2
Trans-
former
AA BB
Space for
LL RR
Auxiliary
Submodule
4-63