PARALLEL CONFIGURATION Liebert EXL S1
89
User Manual 10H52226UM60 - Rev. 1 - 01/2017
7.4.4. Procedure 4: TRANSFER FROM MAINTENANCE BYPASS MODE TO
NORMAL MODE
Starting with each UPS in Maintenance Bypass, this procedure explains how transfer the load to
Normal Mode and start the UPS. On each UPS, perform the following procedure:
Step Action Status
1 Switch QS1 to the ON position Rectifier start up
2
Switch QS2 to the ON position (wait for the Static Bypass Switch to
switch 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 pa
ge 39)
When the above steps have been completed for all the UPS in the
parallel system:
6
Touch “Inverter On”.
At this point, the Inverters synchronize and take over the Load
Normal Mode
(On Line)
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