Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 69
6.12.4 Re-Energize a Single Liebert® EXM™ in a Parallel System—Control Panel Firmware
Version 1.0
1. Close the input breaker feeding the Liebert
®
EXM
™
to be re-energized.
2. The LCD on the isolated UPS will turn On and the rectifier will start.
3. On the parallel switchgear, close the Module Output Breaker (MOB) for the isolated UPS.
4. Log in as Operator, Administrator or Service on the control panel of the isolated UPS.
5. Touch the OPERATE tab on the control panel of the UPS to be re-energized.
6. Touch Inverter On.
7. Close all battery circuit breakers, if applicable.
8. Verify that all the power modules have green Run lights.
9. Verify that the LED light bar (if applicable), the LED on the control panel and the status bar are green.
6.12.5 Place a Liebert® EXM™ Parallel System with SKRU Interlock in Maintenance
Bypass—Control Panel Firmware Version 1.0
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
The UPS’s will not be supporting the connected load. The load will not be protected from utility input
power failure.
1. Log in as Operator, Administrator or Service on the control panel of the UPS to be placed in bypass.
2. Touch the OPERATE tab on the control panel of UPS1.
3. Touch Inverter Off.
4. Repeat Steps 2 and 3 on UPS 2.
If the system is 1+1 or 2+0, both units will transfer to bypass.
If the system is 2+1, the output of UPS 2 will be disabled.
5. Repeat Steps 2 and 3 on UPS 3 and any other UPS in the system, if applicable.
All UPS’s in the system will transfer to bypass.
6. Open all battery circuit breakers, if applicable.
7. Check the parallel switch gear.
Steps a through d are applicable only if the system has a Kirk key interlock. If the system does not have a Kirk
key interlock, skip to Step e.
a. Verify that the K0 light illuminates.
b. Press and hold the interlock push button.
c. While holding the push button, turn and release the key from the Kirk key interlock.
d. Insert the key into the Maintenance Bypass Breaker (MBB) lock and turn to unlock the latch from the
breaker.
e. Close MBB.
f. Open the Maintenance Isolation Breaker (MIB)
g. Steps h and i are applicable only if the system has a Kirk key interlock. If the system does not have a
Kirk key interlock, skip to Step 8.
h. Turn the key, locking MIB in place, then remove key.
i. Insert the key into K0 and turn it to lock the key in place.
j. The critical load is now on external maintenance bypass.
8. Open all Module Output Breakers (MOB)
9. Open the input breakers that feed each UPS.
10. The UPS’s are now Off, and the load is supplied by external maintenance bypass.
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.
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