Siemens S5-135U/155U appendix Fan, Step Action Result, Ensure correct polarity

Central Controllers and Expansion Units Power Supply Units

How to Replace a The following steps are necessary to replace a fan:

Fan

Step

Action

Result

1

2

Place one hand under the fan	When the screwdriver is pulled
you wish to replace, and use the	out, the snap hook is released.
other hand to insert a	By pulling on the round hole on
screwdriver (DIN 5265, blade	the underside of the fan sub-
width 3.5-6.5 mm) into the	assembly it swings down and
unlock fan opening.	can be pulled out.

±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

2a

2b

2c

Action

Unscrew the rechargeable bty from below.

Disconnect the connecting cable.

Insert the rechargeable bty in the new fan subassembly (see section entitled ªReplacing the rechargeable batteryº) and reconnect the connecting cable.

Important:

Ensure correct polarity.

3

Insert the new fan subassembly with the tab at the rear into the housing, and swivel it up.

The fan subassembly locks in place.

4-42	System Manual
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