Vertiv Liebert EXM2 - Procedures for Inserting One Isolated UPS Module in Parallel System; Procedures for Completely Powering down UPS; Procedures for Complete UPS Shutdown While Maintaining Power to Load

8.3.4 Procedures for Inserting One Isolated UPS Module in Parallel System
IM PO R T A N T ! These pro cedures shall only be carried out by service personnel of Vertiv or under
their guidance.
The following procedures are used to reintegrate a UPS module that has been previously isolated from the parallel system:
1. Confirm that the I/O cable, battery cable of the single module are correctly connected.
2. Confirm that the maintenance bypass switch Q3 or the single module external maintenance switch is
disconnected. Close the output switch Q5, external output switch, external power bypass switch, bypass input
switch Q2, rectifier input switch Q1, and external power mains switch of each UPS in turn.
3. When the single module starts, close the BCB and then manually turn on the inverter.
Wait a few seeconds after starting the inverter of inserted UPS system, it connects with existing systems for parallel operation
atuomatically.
8.3.5 Procedures for Completely Powering Down UPS
W A RN IN G!
1. Post a lab el at the AC input distribution (generally far aw ay from the U P S) to alert that the
UP S service is being op erated.
2. W ait 10 m inutes for the internal D C bus capacitance discharg ing . Then the U PS is
com pletely shut down.
W A RN IN G! Hazardous b attery voltage
The battery term inals still have hazardous voltage after the U PS com p lete shutdow n .
Complete UPS shutdown and load power-off should follow this procedure. All power switches, isolating switches and breakers
are disconnected, and then UPS no longer supplies power to the load.
CA U T IO N: The follow ing procedures w ill cut off the load pow er, m aking the load com pletely
pow er off.
1. Pressing the EPO button of each UPS stops the operation of rectifier, inverter, static switch and battery.
2. Disconnect the rectifier input switch Q1 and bypass input switch Q2 of each UPS. At the moment, all the internal
power supply is closed, and the TOUCHSCREEN does not display any more.
3. Disconnect the output switch Q5 of each UPS.
8.3.6 Procedures for Complete UPS Shutdown while Maintaining Power to Load
The following procedures are applicable for completely powering down the UPS and still keeping the power supply to the load.
Refer to the procedures in Maintenance Bypass Procedures on page145
8 Parallel System and LBS System
147
Vertiv™ Liebert® EXM2 UPS User Manual