Vertiv Liebert EXL - Procedure 2: Parallel UPS Turn-Off; Procedure 3: Normal to Maintenance Bypass (Parallel)

Liebert EXL S1 PARALLEL CONFIGURATION
User Manual 10H52226UM60 - Rev. 1 - 01/2017
88
7.4.2. Procedure 2: UPS TURN-OFF PROCEDURE
Starting with each UPS in Normal Mode, this procedure explains how to switch off the UPS units. When
this procedure is followed completely, the output voltage will be completely turned off and any load(s)
connected to the UPS output will be shut down. On each UPS, perform the following procedure:
7.4.3. Procedure 3: TRANSFER FROM NORMAL MODE TO MAINTENANCE
BYPASS MODE
Starting with each UPS in the Normal Mode, this procedure explains how transfer the load to
Maintenance Bypass and shut down the UPS. On each UPS, perform the following procedure:
Step Action Status
1
Touch “Inverter Off”.
At this point, the Load is supplied by the Bypass
System in Bypass
Mode
2
Switch battery breaker
1)
to the OFF position
1) Not available for all ratings
3 Switch QS4 to the OFF position Load not supplied
4 Switch QS2 to the OFF position
5 Switch QS1 to the OFF position
Step Action Status
1
Touch “Inverter Off”.
At this point, the Load is supplied by the Bypass
System in Bypass
Mode
2
Switch battery breaker
1)
to the OFF position
1) Not available for all ratings
Battery disconnector
3
Switch QS3
2)
to the ON position
2)
Not available for 600/800/1000/1200kVA (see para 3.3. on page 39)
4 Switch QS4 to the OFF position Service Mode
5 Switch QS1 and QS2 to the OFF position
Maintenance Bypass
Mode - UPS
completely de-
energized