Siemens SINAMICS S120 Equipment Manual page 290

Maintenance and servicing
9.4 Replacing components
Description
The average service life of the device fans is 50,000 hours. In practice, however, the service
life depends on other variables (e.g. ambient temperature, degree of cabinet protection, etc.)
and, therefore, may deviate from this value.
The fans must be replaced in good time to ensure that the device is available.
Preparatory steps
● Disconnect the drive line-up from the power supply.
● Allow unimpeded access.
● Remove the protective cover.
Removal
The removal steps are numbered in accordance with the figure.
1. Remove the retaining screws for the fan unit (3 screws).
2. Disconnect the supply cables (1 x "L", 1 x "N").
CAUTION
When removing the fan, ensure that the cables are not damaged.
Installation
For installation, carry out the above steps in reverse order.
CAUTION
The tightening torques specified in the table "Tightening torques for connecting current-
conducting parts" must be observed.
Carefully establish the plug-in connections and then ensure that they are secure.
The screw connections for the protective covers must only be tightened by hand.
288
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1