User Manual 10H52192UM60 - Rev. 1 - 09/2011 55
Service Liebert NX
7. Close the UPS output switch QS4 and the input switches QS1 and QS2 in turn.
Two minutes later, the bypass indicator on the operator control and display panel turns on, indicating that the UPS is operating in
bypass mode.
8. Open the maintenance switch QS3, press and hold the INVERTER ON button on the operator control and display panel for two
seconds to manually turn on the inverters; the UPS transfers to normal mode.
7.2 Air Filter Replacement Procedure
As shown in Figure 7-1 and Figure 7-2, the UPS is equipped with air filters on the back of the front door. Each air filter is secured by a
fixing bar on both sides. To replace the air filter, proceed as follows:
1. Open the front door of the UPS to access the air filters on the back of the door.
2. Remove the fixing bar on either side of the air filter and loosen the fixing screws of the fixing bar on the other side; it is not
necessary to remove this fixing bar.
3. Remove the air filter and insert a clean one.
4. Reinstall the fixing bar in its original position.
5. Tighten the fixing screws of the fixing bar on the other side.
Figure 7-1 Replacing Air Filter on 30 kVA UPS
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