Vertiv Liebert EXL - Procedure 4: Maintenance Bypass to Normal; Inverter Stop;Start Procedures; Single UPS - Start Inverter; Single UPS - Stop Inverter

Normal and safe operation Liebert EXL S1
81
User Manual 10H52226UM60 - Rev. 1 - 01/2017
5.7.3. Procedure 3: TRANSFER FROM NORMAL MODE TO MAINTENANCE
BYPASS MODE
Starting with the UPS in the Normal Mode, this procedure explains how to transfer the load to
Maintenance Bypass and shut down the UPS.
5.7.4. Procedure 4: TRANSFER FROM MAINTENANCE BYPASS MODE TO
NORMAL MODE
Starting with the UPS in the Maintenance Bypass mode, this procedure explains how transfer the load
to Normal Mode and start the UPS.
Step Action Status
1 Touch “Inverter Off” on the touch screen. 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
Step Action Status
1 Switch QS1 to the ON position Rectifier start up
2
Switch QS2 to the ON position (wait for Static Bypass Switch to
turn on)
Static Bypass Switch
ON and fans ON
3
Close external battery switches then set battery breaker
1)
to the
ON position
1) Not available for all ratings
4 Switch QS4 to the ON position
System in Bypass Mode
- Output voltage
present
5
Switch QS3
2)
to the OFF position
2)
Not available for 600/800/1000/1200kVA (see para 3.3. on page 39)
6 Touch “Inverter On” on the touch screen. Normal Mode