Siemens S5-135U/155U appendix Replacing Filter Mat Inadequate Air, Flow

Central Controllers and Expansion Units Power Supply Units

Replacing the

Filter Mat

Inadequate Air	If the filter mat is clogged and the power supply unit no longer receives
Flow	sufficient air, the ªAlarmº LED lights up, LEDs for ªFan 1,º ªFan 2º and
	ªFan 3º flash and the ªAlarmº relay picks up. The fault can be cleared by
	replacing the filter mat (see ordering information for the order number).
How to Replace	Correct the fault in the following steps:
the Filter Mat

Step

Action

1

2

3

4

5

6

7

Release the filter subdrawer.

Swivel the filter subdrawer downwards and pull it forwards and out.

Remove the old filter mat.

Insert a new filter mat in the filter subdrawer.

Place the distance grid on the new filter mat.

Insert the filter subdrawer in the guide rails, slide it back and swivel it up so that it locks in place.

Press the Reset button.

Result:± Fault LEDs for ªAlarm,º ªFan 1,º ªFan 2º and ªFan 3º go off.

± Contacts 11 and 12 are closed in the ªAlarmº relay.

4-46	System Manual
	C79000-G8576-C199-06