Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 67
6.11.2 Re-Energize a Liebert® EXM™ Parallel System—Control Panel Firmware Version 1.1
To restart Liebert
®
EXM
™
parallel system from a fully powered-down condition using V1.1 controller
firmware:
1. Log in as Operator, Administrator or Service.
2. Close the input breakers for all UPS’s
3. The LCD on each UPS will turn On and the LCD icons will begin flashing green, and the rectifier will start.
The bypass and output icons will illuminate green.
The battery LED will illuminate red.
4. Close the Module Output Breakers (MOB) circuit breaker to each UPS.
5. Close the MIB circuit breaker.
6. Touch the OPERATE tab
7. Touch the Inverter On radio button. A pop-up window states that the system is operating in a multi-
module system and asks whether to start one inverter or the entire system.
8. Touch System.
The LCD icons will start flashing green while the unit goes through the inverter startup sequence. After about
a minute, the inverter will turn On, the static bypass will open and the icons will be solid green.
9. Close all battery breakers.
6.12 Parallel Operations—Control Panel Firmware Version 1.0
6.12.1 De-Energize a Liebert® EXM™ Parallel System—Control Panel Firmware Version 1.0
To de-energize a parallel system:
1. Log in as Operator, Administrator or Service.
2. Touch the OPERATE tab on the control panel of UPS 1.
3. Touch Inverter Off.
4. Repeat Steps 2 and 3 for UPS 2.
If the system is 1+1 or 2+0, both units will go to bypass.
If the system is 2+1, the output for UPS 2 will be disabled.
5. Repeat Steps 2 and 3 for UPS 3 and any other UPS in the system if applicable.
All units in the system will go to bypass.
6. Open all battery circuit breakers, if applicable.
7. Check the parallel switchgear.
NOTICE
Risk of loss of power to the connected load. Can cause equipment damage.
The following procedure will remove power from the critical bus. Before beginning these steps, shut down
the connected load or transfer the connected load to an input power supply not dependent on the
Liebert
®
EXM
™
system that is being de-energized.
a. If the parallel switchgear is a matching Vertiv
™
cabinet, open the Maintenance Isolation Circuit
Breaker (MIB).
b. Open all Module Output Breakers (MOB).
8. Open the input breaker for each UPS and the breaker feeding the Maintenance Bypass Breaker (MBB) in
the parallel switch gear.
The system is now de-energized, and its output power supply is Off.
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. Verify that the connected load
is prepared for input current.
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