Siemens SINAMICS S120 Equipment Manual page 172

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, including ambient temperature and the degree of cabinet
protection 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 steps
The steps for the removal procedure are numbered in accordance with Fig. 9-12.
1. Disconnect the plugs for the fiber optic cables and signal cables (5 plugs).
2. Remove the DRIVE-CLiQ cables and connections on –X41 / –X42 (5 plugs).
3. Remove the retaining screws for the slide-in electronics unit (2 screws).
Caution
When removing the fan, ensure that you do not damage any signal cables.
You then have to remove the fan for the slide-in electronics unit.
You now have to remove the plug for the fan power supply from the slide-in electronics unit.
Installation
To re-install the fan, carry out the above steps in reverse order.
Caution
The tightening torques specified in Table 9-1 must be observed.
Carefully re-establish the plug connections and ensure that they are secure.
The screwed connections for the protective covers must only be tightened by hand.
9-28
When removing the slide-in electronics unit, you have to disconnect 5 further plugs one
after the other (2 at the top, 3 below).
SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
Chassis Power Units Liquid Cooled