Siemens S5-135U/155U System Manual page 112

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 "Alarm" LED lights up, LEDs for "Fan 1," "Fan 2" and
"Fan 3" flash and the "Alarm" 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
4-46
Step
Release the filter subdrawer.
1
2 Swivel the filter subdrawer downwards and pull it forwards and out.
Remove the old filter mat.
3
Insert a new filter mat in the filter subdrawer.
4
Place the distance grid on the new filter mat.
5
Insert the filter subdrawer in the guide rails, slide it back and swivel it up so
6
that it locks in place.
Press the Reset button.
7
Result: – Fault LEDs for "Alarm," "Fan 1," "Fan 2" and
"Fan 3" go off.
– Contacts 11 and 12 are closed in the "Alarm" relay.
Action
System Manual
C79000-G8576-C199-06