beautypg.com

3 installation – Siemens S5-135U/155U User Manual

Page 129

background image

4-63

System Manual
C79000-G8576-C199-06

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.

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

Connector

X2

BB
RR

AA
LL

Front Plate

Trans-
former

Space for

Auxiliary
Submodule

Installing the 15 V
Auxiliary
Submodule

Central Controllers and Expansion Units Power Supply Units