Siemens S5-135U/155U - Manual (Page 90)

4-24
System Manual
C79000-G8576-C199-06
The following table shows the procedure for placing the power supply unit
(PSU) in operation without changing the jumper setting:
Stage Description
1 Fit the PLC, allowing for clearances for access in the event of repairs
and for adequate ventilation. Observe chassis grounding.
2 Fit the lithium battery (if available) in the battery compartment on the
right front of the power supply unit (ensure correct polarity).
Hinweis: Die Lithium-Batterie müssen Sie getrennt bestellen (siehe
Bestellhinweise).
3 Remove the right-hand fan subassembly, plug in the red positive lead of
its rechargeable battery and reinsert the fan.
4 Check that the voltage selector switch is set to your desired voltage.
5 Connect the 24 V load voltage leads to the “Voltage Monitor” terminals.
6 When connecting the AC leads, fit an isolating device to isolate the
power supply unit from the AC line voltage.
7 Connect the primary voltage leads and the protective conductor.
8 Switch on the primary voltage and the 24 V load voltage.
9 Use the “Power” switch to switch on the power supply unit.
10 If the required basic load is in circuit, no red LED lights up and the
power supply unit is operational.
All activities relating to startup of the power supply units are described in
detail on the following pages.
Brief Instructions
for Startup
Central Controllers and Expansion Units Power Supply Units