Operation
63
Liebert
®
e
XM
™
7.6
De-Energize Liebert
e
XM with Maintenance Bypass Cabinet
NOTICE
Risk of loss of input power to the critical load. Can cause equipment damage.
This procedure will remove power from the critical bus. Shut down the connected load
properly and verify that no connected equipment requires input power before beginning this
procedure.
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 the internal battery breaker (if applicable).
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.
Summary of Contents for Liebert eXM
Page 1: ...Liebert eXM User Manual 60 100kVA 50 60Hz ...
Page 2: ......
Page 8: ...vi ...
Page 89: ...Maintenance 81 Liebert eXM NOTES ...
Page 90: ...Maintenance Liebert eXM 82 ...
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