Siemens S5-135U/155U appendix Replacing a Power, Standard spare part, Reaction

Central Controllers and Expansion Units Power Supply Units

Replacing a Power	If it should be necessary to replace the power supply unit in a system during
Supply Unit	commissioning or during operation, we recommend you proceed as follows:
	Requirement:
	Redundant backup, ªSpare power supplyº without rechargeable battery
	(standard spare part).
	The lithium battery in the rack is in full working order.

Step

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Action

Disconnect the faulty power supply from the system voltage and remove it.

Set the jumpers on the spare power supply according to your needs.

Push the spare power supply into the rack and screw it in place.

Remove the right-hand fan subassembly from the defective power supply.

Remove the rechargeable battery from the fan sub- assembly.

Replace the right-hand fan subassembly in the defective power supply.

Remove the right-hand fan subassembly from the spare power supply.

Connect up the spare power supply.

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 ªFan 3º and ªRB lowº light up.

Insert the rechargeable battery in the fan subassembly and connect it up.

Reinsert the right-hand fan subassembly.

After the system has run up, press the reset switch on the spare power supply.

Reaction:

±The LED ªFan 3º goes out

±The fans run at their normal speed again

±The LED ªRB lowº shows the charge state of the rechargeable battery.

System Manual	4-47
C79000-G8576-C199-06