Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 70
6.12.6 Re-Energize a Liebert® EXM™ Parallel System with SKRU Interlock Online from
Maintenance Bypass—Control Panel Firmware Version 1.0
1. Close the input breaker feeding all UPS’s.
The LCD on all the UPS’s will turn On and the rectifier will start.
2. On the parallel switchgear, close the Module Output Breaker (MOB) for all the UPS’s.
Verify that the output LED turns solid green on all UPS’s in the system.
3. This will energize the output of the UPS, and illuminate the interlock push button if the system has a Kirk
key interlock.
4. Check the parallel switch gear.
Steps a through c 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. Press and hold the interlock push button.
b. While holding, turn and release the key from K0.
c. Insert the key into the Maintenance Isolation Breaker (MIB) lock and turn to unlock the latch from the
breaker.
d. Close the MIB.
e. Open the Maintenance Bypass Breaker (MBB)
f. Steps g and h are applicable only if the system has a Kirk key interlock. If the system does not have a
Kirk key interlock, skip to Step 5.
g. Turn the key, locking MBB in place, and then remove the key.
h. Insert the key into the K0 and turn to lock the key in place. The critical load is now powered by the
UPS static switch.
5. Log in as Operator, Administrator or Service on UPS 1.
6. Touch the OPERATE tab.
7. Touch Inverter Off.
8. Repeat Steps 5, 6 and 7 on UPS 2.
9. Repeat Steps 5, 6 and 7 on UPS 3 and any other UPS in the system, if applicable.
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.
13. Check the LCD’s on each UPS to verify that there are no alarms on any UPS.
The system is now online and supporting the load.
6.13 Emergency Shutdown With EPO
This circuit has been designed to switch Off the UPS in emergency conditions (e.g., fire, flood,
etc.). The system will turn Off the rectifier, inverter and stop powering the load immediately
(including the inverter and bypass), and the battery stops charging or discharging.
If the input utility is present, the UPS’s controls will remain active; however, the output will be
turned Off. To remove all power from the UPS, the external feeder breaker should be opened.
6.14 Auto Restart
When the main and bypass sources fail, the UPS draws power from the battery system to supply
the load until the batteries are depleted. The UPS will shut down when the battery system
reaches its end of discharge (EOD) threshold.
The UPS will automatically restart and enable output power:
• after utility power is restored
•if Auto Recovery after EOD Enabling is enabled in the UPS configuration (set at the factory or by Vertiv
™
Services)
• after the Auto Recovery after EOD Delay Time expires (the default delay is 10 minutes)
During the auto recovery delay, the Liebert
®
EXM
™
will be charging its batteries to provide a safety margin
for equipment shutdown if input power fails again.
If the Auto Recovery after EOD Enabling feature is disabled, the system must be restarted manually.
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