Siemens S5-135U/155U - Manual (Page 113)

4-47
System Manual
C79000-G8576-C199-06
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 is 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.
Replacing a Power
Supply Unit
Central Controllers and Expansion Units Power Supply Units