Vertiv Liebert EXM - 6.8 De-Energize Liebert EXM with Maintenance Bypass Cabinet

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 64
6.8 De-Energize Liebert® EXM™ with Maintenance Bypass Cabinet
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
This procedure must be performed by properly trained and qualified personnel who are knowledgeable
about the operation of this system. This procedure will remove power from the critical bus.
Take precautions by providing a backup power supply or shutting down equipment before de-energizing
the Liebert
®
EXM
™
.
To de-energize the system:
1. Log in as Operator, Administrator or Service.
2. Touch the OPERATE tab.
3. Touch the Inverter Off radio button.
4. To continue, confirm turning Off the inverter when prompted.
5. Open all battery circuit breakers(s) including the internal battery breaker (if applicable).
6. If the MBC is a Vertiv
™
cabinet, open the Maintenance Isolation Circuit Breaker (MIB). If the MBC is a
customer-issued switchgear or a non-Vertiv
™
cabinet, open the breaker(s) that supply power to the
critical bus.
7. Open the Rectifier Input Circuit Breaker and Bypass Input Breaker (if dual input). If the MBC is a
customer-issued switchgear or a non-Vertiv
™
cabinet, open the breaker(s) that supply power to the UPS
input and bypass input (if dual input).
8. Allow 5 minutes for all DC circuits and capacitors to fully discharge.
9. Open the external feeder breaker to the MBC or bypass switchgear.
10. Install a Lockout/Tagout on the external feeder breaker to the MBC or bypass switchgear.
11. Use a digital multimeter to verify there is no AC or DC voltage present at the UPS input, output and
bypass bus bars.
12. Use a digital multimeter to verify there is no AC or DC voltage present at the MBC BIB, MIB and MBB
breakers.