Replacing The Fans - Siemens S5-155U System Manual

Replacing the fans

System Manual
C79000-B8576-C199-03
Caution
Ensure correct polarity when inserting the battery or applying
backup voltage!
Caution: LITHIUM THIONYL CHLORIDE BATTERY!
Do not discard a new or discharged battery in a fire and do not
solder on the cell body (max. temperature 100
not recharge, there is a risk of explosion. Do not open the battery,
only replace it by the same type. Procure the replacement from
Siemens; see the ordering information for order number. This
ensures that you have a short-circuit protected type. Old batteries
with a residual charge should be discharged by means of a
10 ohm resistor or flashlight bulb until there is no longer a
measurable no-load voltage.
Lithium thionyl chloride batteries without residual charge should
be sent for recycling.
The expected service life of the fans (see Technical Specifications)
depends on their operating time, ambient temperature and ambient
conditions. In the event of fan failure during operation, subsequent
damage to modules, for example, is avoided by the activated fan
monitor (jumper F-R closed); the power supply unit is switched off.
In individual cases, a preventive replacement of fans at suitable
intervals may be advisable.
Proceed as follows to replace the fans:
Step Action
1 Disconnect power from the power supply.
2 Remove the power supply.
3 Slacken the fixing screws of the fans.
4 Pull off the plug-in contacts of the fan supply.
5 Connect the plug-in contacts of the new fans.
6 Tighten the fixing screws of the fans.
7 Refit the power supply.
8 Switch the power supply on.
The order numbers for the backup battery and fan unit can be found in
the ordering information.
6ES5 955-3NA12 Power Supply Unit
o o
C (212 F)). Do
4
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