Siemens S5-135U/155U System Manual page 108

Central Controllers and Expansion Units Power Supply Units
How to Replace a
The following steps are necessary to replace a fan:
Fan
1
2
3
4-42
Step Action
Place one hand under the fan
you wish to replace, and use the
other hand to insert a
screwdriver (DIN 5265, blade
width 3.5-6.5 mm) into the
unlock fan opening.
– If this is not the right-hand fan subassembly, go directly to
Step 3 after removing the old fan subassembly.
– If this is the right-hand fan subassembly, proceed as follows:
Step Action
2a Unscrew the rechargeable bty from below.
2b Disconnect the connecting cable.
2c Insert the rechargeable bty in the new fan
subassembly (see section entitled "Replacing the
rechargeable battery") and reconnect the
connecting cable.
Important:
Ensure correct polarity.
Insert the new fan subassembly
with the tab at the rear into the
housing, and swivel it up.
Result
When the screwdriver is pulled
out, the snap hook is released.
By pulling on the round hole on
the underside of the fan sub-
assembly it swings down and
can be pulled out.
The fan subassembly locks in
place.
System Manual
C79000-G8576-C199-06