Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 68
6.12.2 Re-Energize a Liebert® EXM™ Parallel System—Control Panel Firmware Version 1.0
To re-energize a parallel system:
1. Close the input breakers for all UPS’s in the system.
2. The LCD on each UPS will turn On and the rectifier will begin to start.
3. Close the Module Output Breakers (MOB) circuit breaker to each UPS.
The static switch will turn On.
4. Close the MIB circuit breaker.
5. Verify that the K0 light illuminates.
6. Log in as Operator, Administrator or Service on UPS 1
7. Touch the OPERATE tab on the control panel of UPS 1.
8. Touch Inverter On.
9. Repeat Steps 7 and 8 for UPS 2 and any other UPS in the system.
The UPS's will all synchronize and transfer online. The load will now be supported by the inverters.
10. Close all battery circuit breakers if applicable.
11. Verify that all the power modules have green Run lights.
12. Verify that the LED light bar (if applicable), the LED on the control panel and the status bar are green.
6.12.3 De-Energize and Isolate a Single Liebert® EXM™ in a Parallel System—Control Panel
Firmware Version 1.0
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
The following procedure will remove power from one UPS in the parallel system. Do not proceed if the
other UPS’s supplying the critical load cannot accommodate the additional load. If the UPS’s remaining
energized cannot supply the full critical load, the system will go into overload and may switch the load to
bypass power, where it will not be protected from utility power failure.
1. Determine whether the parallel system is set up for capacity or redundancy.
2. Verify that the UPS’s in the parallel system that will remain energized can support the connected load.
3. Log in as Operator, Administrator or Service on the UPS to be de-energized.
4. Touch the OPERATE tab on the control panel of the UPS to be de-energized.
5. Touch Inverter Off.
6. Open the Module Output Breaker (MOB) associated with the isolated UPS.
7. Open all battery circuit breakers associated with the UPS.
8. Open the input breaker feeding the UPS being de-energized.
The UPS to be removed from the system is in the Off state. The other UPS’s in the system will display
parapowerCANCommAbnorm and an alarm will sound on the other UPS’s because they lost communication
with the isolated UPS.
WARNING
Risk of electric shock. Can cause equipment damage, injury and death.
The following procedure will supply power to the critical bus. Before beginning,
notify all personnel that input power is being supplied to the circuits and verify
that the connected load is prepared for input current.
NOTE
The load LED will turn back on until Step 6.
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