Emerson 115-600V, 115-120, 15-90KVA De-Energize Liebert APM with Maintenance Bypass Cabinet

Operation

10.6De-Energize Liebert APM with Maintenance Bypass Cabinet.

! CAUTION

This procedure will remove power from the critical bus.

To de-energize the system:

1.On the UPS control panel, press and hold the INVERTER OFF button for 2 seconds.

2.Open all battery circuit breakers(s) including internal battery breaker (if applicable).

! CAUTION

Performing the next step will shut down the critical load.

3.If the MBC is an Emerson cabinet, open the Maintenance Isolation Circuit Breaker (MIB). If the MBC is a customer-issued switchgear or a non-Emerson cabinet, open the breaker(s) that supply power to the critical bus.

4.Open the Rectifier Input Circuit Breaker and Bypass Input Breaker (if dual input). If the MBC is a customer-issued switchgear or a non-Emerson cabinet, open the breaker(s) that supply power to the UPS input and bypass input (if dual input).

5.Allow 5 minutes for all DC circuits and capacitors to fully discharge.

6.Open the external feeder breaker to the MBC or bypass switchgear.

7.Install a Lockout/Tagout on the external feeder breaker to the MBC or bypass switchgear.

8.Use a digital multimeter to verify there is no AC or DC voltage present at the UPS input, output and bypass bus bars.

9.Use a digital multimeter to verify there is no AC or DC voltage present at the MBC BIB, MIB and MBB breakers.

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