PARALLEL CONFIGURATION
Liebert EXL S1
87
User Manual 10H52226UM60 - Rev. 1 - 01/2017
7.3. Communication between UPS blocks
UPS units exchange information through the connector cable (37
pin connector). Fig.
51
displays the
loop circuit, which is electronically monitored. The communication cables are shielded and must be
run separately and away from the power cables.
The CAN communication among the units will be possible only if two of the units making the parallel
are equipped with terminators over the CAN line.
The CAN bus termination can be set using jumper J2 over the Parallel Board; if the jumper is in
position 1-2 the terminator will be ON. When 3 or more units are connected in a parallel, remove the
exceeding terminators placing the jumper in position 2-3.
7.4. Parallel switching procedures
The following procedures refer to para 5.3. on page
75
.
7.4.1. Procedure 1: UPS TURN-ON PROCEDURE
Starting with each UPS completely deenergized, this procedure explains how to switch on UPS units
and set them to Normal Operation Mode. On each UPS, perform the following procedure:
Warning
If static switch module and relative switches are not assembled, refer to MSS user
manual.
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
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
IMPORTANT: when switch QS4 is closed, the output of the UPS and
all the loads connected to it will be energized.
System in Bypass Mode -
Output voltage present
When the above steps have been completed for all the UPS units in
the parallel system:
5
Touch “Inverter On”.
At this point, the Inverters synchronize and take over the Load
Normal Mode (On Line)
Summary of Contents for Liebert EXL
Page 1: ...Liebert EXL User Manual...
Page 2: ...Liebert EXL UNINTERRUPTIBLE POWER SUPPLY USER MANUAL 10H52226UM60 rev 1...
Page 7: ...Liebert EXL S1 6 User Manual 10H52226UM60 Rev 1 01 2017...
Page 36: ...Preparation For Use Liebert EXL S1 35 User Manual 10H52226UM60 Rev 1 01 2017 BLANK PAGE...
Page 74: ...CONNECTIVITY PANELS Liebert EXL S1 73 User Manual 10H52226UM60 Rev 1 01 2017 BLANK PAGE...
Page 84: ...Normal and safe operation Liebert EXL S1 83 User Manual 10H52226UM60 Rev 1 01 2017 BLANK PAGE...
Page 86: ...Maintenance Liebert EXL S1 85 User Manual 10H52226UM60 Rev 1 01 2017 BLANK PAGE...
Page 94: ...PARALLEL CONFIGURATION Liebert EXL S1 93 User Manual 10H52226UM60 Rev 1 01 2017 BLANK PAGE...
Page 102: ...Options Liebert EXL S1 101 User Manual 10H52226UM60 Rev 1 01 2017 BLANK PAGE...