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Maintenance 37
Replacing the UPS
To remove the UPS:
1. Power down all attached load devices.
2. Power down the UPS ("Powering down the UPS" on page 30).
3. Switch the circuit breaker for any attached ERMs to the Off (down) position.
4. Switch the battery circuit breaker for the UPS to the Off (down) position.
5. Unplug the UPS power cord.
6. Disconnect the communications cable from the option card.
7. Disconnect the ground bonding cable.
8. Disconnect the REPO port.
9. Unplug the load devices.
10. Unplug all connected extension bars and PDUs.
11. Unplug the ERM connected to the UPS.
12. Remove the UPS front bezel ("Removing the UPS front bezel" on page 32).
13. Remove the UPS battery bracket ("Removing the UPS battery bracket" on page 17).
14. Remove the UPS battery modules.
15. Remove the screws securing the UPS to the rack.
16. Remove the UPS from the rack.
To replace the component, reverse the removal procedure.
Replacing the ERM
To remove the ERM:
1. Switch the circuit breaker for any attached ERMs to the Off (down) position.
2. Unplug the ERM from the back of the UPS.