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Maintenance
35
12.2 UPS Replacement
When using a power distribution box with bypass, the UPS can be removed while powering the load
through the Bypass Switch.
To remove the UPS without shutting off power to the connected load:
1. Turn the Bypass Switch on the power distribution box to the Utility position.
2. Open the Output circuit breaker (on the UPS rear panel).
3. Open the Input circuit breaker (on the power distribution box).
4. Loosen the three captive mounting screws about
20 turns until the power distribution box can be
pulled away from the UPS.
5. Loosen the electrical connector cover by backing
out the two screws holding it one turn each. Also
loosen the end screw one turn.
6. Slide the cover to reach the end screw and cover
the electrical connectors; retighten the three
screws gently to hold the cover in place.
7. Replace the UPS.
8. Loosen the three screws holding the electrical
connector cover again—one turn each.
9. Slide the cover away from the electrical
connectors; gently retighten the three screws.
10. Align the connectors on the power distribution
box and the UPS.
11. Push the power distribution box into place.
12. Holding the power distribution box firmly
against the UPS, tighten the three captive
mounting screws until the box is secure. Do NOT
overtighten the screws.
13. Close the Input circuit breaker (on the power
distribution box).
14. Close the Output circuit breaker (on the UPS
rear panel).
15. Turn the Bypass Switch on the power
distribution box back to the UPS position.
NOTE
During the procedure, the connected load will not be protected from power disturbances, such
as spikes, sags and failure.
DISCONNECT BYPASS POWER TO
THE MANUAL BYPASS SWITCH.
Mounting screws
for removable power
distribution box
Screws securing electrical
connector cover
Electrical
connector
cover
Electrical connectors