Maintenance
12.2UPS Power Module Replacement
! CAUTION
The UPS must be switched to manual bypass before personnel begin to replace the power module.
NOTE
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.Press the Off button on the front panel one time.
b.Slide the bracket away from the manual bypass switch on the rear of the
c.Remove the front grille covering the power module.
2.Move the manual bypass breaker on the rear of the UPS to the bypass
3.Open the input circuit breaker on the rear of the UPS (see Figure 10).
4.Open the output circuit breaker on the rear of the UPS (see Figure 10).
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9.Slide the power module out the front, supporting its weight as it is withdrawn.
10.Insert the replacement UPS power module.
11.Reconnect the slotted internal battery connectors.
12.Reconnect the external battery cables, if used.
13.Reattach both front cover grilles.
14.Reattach the front plastic bezels.
15.Close the input circuit breaker on the rear of the UPS (see Figure 10).
16.Close the output circuit breaker on the rear of the UPS (see Figure 10).
17.Move the bypass breaker on the rear of the UPS back to the INVERTER position (see Figure 10).
18.Slide the bracket back next to the manual bypass breaker and tighten its thumbscrew.
19.Press the On button on the front panel one time to return the UPS to Normal Mode operation.
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