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Maintenance 49
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 44).
3. Switch the circuit breaker for any attached ERMs to the Off position.
4. Unplug the UPS power cord.
5. Disconnect the communications cable from the option card.
6. Disconnect the ground bonding cable.
7. Disconnect the REPO port.
8. Unplug the load devices.
9. Unplug the ERM connected to the UPS.
10. Remove the UPS front bezel ("Removing the UPS front bezel" on page 45).
11. Disconnect the battery leads.
12. Remove the UPS battery bracket.
13. Remove the UPS battery modules.
14. Remove the screws securing the UPS to the rack.
15. 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 position.
2. Unplug the ERM from the back of the UPS.
3. Unplug the ERM from a second connected ERM.
4. Remove the front bezel ("Removing the ERM front bezel" on page 45) on the ERM that is being
replaced.
5. Disconnect the battery leads.
6. Remove the screws securing the ERM to the rack.
7. Remove the ERM from the rack.
To replace the component, reverse the removal procedure.
Replacing the UPS option card
This component is hot-swappable and can be replaced without powering down the UPS.
1. (optional) To replace the component with the UPS powered down, refer to "Powering down the UPS (on
page 44)."
2. Disconnect the communications cable from the option card.