Replacing A Power Supply Unit - Siemens S5-155U System Manual

Power Supply Units
Replacing a power supply
unit
4 - 50
If it should be necessary to replace the power supply unit in a system
during commissioning or during operation, we recommend you
proceed as follows:
Requirement:
Redundant backup, "Spare power supply" without
rechargeable battery (standard spare part).
The lithium battery in the rack in in full working order.
Step Action
1 Disconnect the faulty power supply from the system
voltage and remove it.
2 Set the jumpers on the spare power supply according to
your needs.
3 Push the spare power supply into the rack and screw it in
place.
4 Remove the right-hand fan subassembly from the
defective power supply.
5 Remove the rechargeable battery from the fan sub-
assembly.
6 Replace the right-hand fan subassembly in the defective
power supply.
7 Remove the right-hand fan subassembly from the spare
power supply.
8 Connect up the spare power supply.
9 Switch on the system voltage and the power supply in any
order.
Reaction:
- The system runs up
- Both fans run at an increased speed
- The LEDs "Fan 3" and "RB low" light up.
10 Insert the rechargeable battery in the fan subassembly and
connect it up.
11 Reinsert the right-hand fan subassembly.
12 After the system has run up, press the reset switch on the
spare power supply.
Reaction:
- The LED "Fan 3" goes out
- The fans run at their normal speed again
- The LED "RB low" shows the charge state of the
rechargeable battery.
System Manual
C79000-B8576-C199-03