10
Appendix
Maintenance bypass usage
Procedure to view the alarm:
1
2
3
4
5
6
7
1. UPS 1 mains input circuit
breaker
2. UPS 2 mains input circuit
breaker
3. UPS 1 bypass input circuit breaker 4. UPS 2 bypass input circuit
breaker
5. UPS 1 output circuit
breaker
6. UPS 2 output circuit breaker
7. Maintenance bypass circuit
breaker
8. Maintenance bypass circuit
breaker cover
8
Hot-swap terminals
ON
OFF
The procedure is as follows:
Open the maintenance bypass circuit breaker cover on the PDU front panel.
The UPS generates the "Maint. Breaker close" alarm (the Alarm indicator is on and the buzzer buzzes) and transfers
to bypass mode.
Close the maintenance bypass circuit breaker on the PDU front panel.
Open the UPS input and output circuit breakers on the PDU front panel and the battery switch (if the battery pack
does not have a switch, disconnect the battery pack hot-swap terminal).
Disconnect the hot-swap terminals between the PDU and the UPS.
Use a multimeter to check that the UPS input and output voltages are 0.
You can maintain the UPS.
