Maintenance
57 Liebert
®
GXT4
™
User Manual
6.6 Replacing the Power Module on 8000 and 10,000VA models
NOTICE
During the procedure, the connected load will not be protected from power disturbances, such as
spikes, sags and failure.
To remove the UPS power module without shutting off power to the connected load:
1. Place the UPS on internal bypass. This may be done by any of the three following methods:
a. Refer to 4.4 - Manual Bypass.
b. Slide the bracket away from the manual bypass switch on the rear of the UPS; this requires
loosening the captive screw and sliding the bracket away from the manual bypass switch.
c. Remove the front grille covering the power module.
2. Move the manual bypass breaker on the rear of the UPS to the bypass position; this requires loosening
the captive screw and sliding the bracket away from the manual bypass switch (see Figure 1-6).
3. Open the input circuit breaker on the rear of the UPS (see Figure 1-6).
4. Open the output circuit breaker on the rear of the UPS (see Figure 1-6).
5. Remove the top two front plastic bezels by pulling them forward.
6. Remove the power module cover grille and the battery cover grille with the screws securing them to
the frame.
7. Disconnect the slotted battery connectors from the internal battery packs.
8. If additional external batteries are used, disconnect the two external battery connectors.
9. Slide power module restraint lever up out of the locked position.
10. Slide the power module out the front, supporting its weight as it is withdrawn.
Figure 6-4 Removing power module from Liebert GXT4 8000 and 10,000VA models
11. Insert the replacement UPS power module.
12. Slide the power module restraint lever back into the locked position.
13. Reconnect the slotted internal battery connectors.
CAUTION
The UPS must be switched to manual bypass before personnel begin to replace the power
module.
Power module
pulled part of
the way out of
an 8000 or
10,000VA unit
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