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Appendix
Maintenance bypass usage
ON
OFF
1
1. UPS1 mains input circuit
breaker
5. UPS1 output circuit
breaker
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 2 bypass input circuit breaker and UPS 2 output circuit breaker on the PDU front panel.
Open 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.
Hot-swap terminals
Use a multimeter to check that the UPS input and output voltages are 0. You can maintain the UPS.
2
3
4
2. UPS2 mains input circuit
breaker
6. UPS2 output circuit breaker
5
6
3. UPS1 bypass input circuit breaker
7. Maintenance bypass circuit
breaker
9
7
8
4. UPS2 bypass input circuit
breaker
8. Maintenance bypass circuit
breaker cover
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