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Vertiv™ Liebert EXS 80kVA UPS User Manual
6 Parallel System and LBS System
Figure 6-3 EPO circuit diagram
J3 3.3
EPO
UPS1
EPO
UPS 2
UPS1
UPS 2
J3 3.4
J3 3.3
J3 3.4
J3 3.1
J3 3.2
J3 3.1
J3 3.2
board
Communication
Communication
board
Communication
board
Communication
board
EPO
EPO
UPS 2
UPS 1
UPS 2
UPS 1
J2 2.3
J2 2.4
J2 2.1
J2 2.2
Bypass module
Bypass module
J2 2.3
J2 2.4
Bypass module
J2 2.1
J2 2.2
Bypass module
J14 14.6
J14 14.8
J14 14.6
J14 14.8
J14 14.2
J14 14.4
J14 14.2
J14 14.4
NOTE: In Figure 6-3, the upper one is Normally Open type, and the lower one is Normally Closed type.
6.4 Operation Procedures for Parallel System
6.4.1. Check before Start-up
1.
Check and confirm that the UPS power distribution mode is correct, that the power cables and signal
cables are connected correctly, and there are no short circuits.
2. Check that the batteries have been installed properly, the cables have been connected correctly, and
that the positive and negative battery poles are correct.
3. Check all the working status of the parallel system, ensure that the phase sequence of the main, bypass
and output of each UPS is correct and consistent, that the connection of the parallel cable is reliable,
and that the user load is not connected during power-on.
4. Measure the mains voltage and frequency, and verify that they are correct.
5. The UPS output terminals are energized when the UPS is switched on. If the load has been already
connected to the output terminals, make sure that it is safe to apply power to it.
WARNING! 1. These procedures result in mains voltage being applied to the UPS output
terminals.
2. If any load equipment is connected to the UPS output terminals, check with the user that it is
safe to apply power. If the load is not ready to receive power, disconnect the downstream load
switch, and stick a warning label on the connection point of the load.
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