Commissioning Of Parallel Cables; Check Before Start-Up; Parallel System Parameters Setting - Liebert S600 User Manual

Close the battery MCB of each UPS.

3.4 Commissioning of Parallel Cables

3.4.1

Check Before Start-Up

1. Check and confirm that power distribution mode of the is correct; that connections of the power cables and the signal
cables are correct and there is no short circuit.
2. Check that the battery installation and cable connection is correct and there is no short circuit, and that the positive
pole and negative pole of the battery are correct. Especially when each UPS of the 20kVA parallel system shares the
battery strings, check these items carefully.
3. Check all the working status of the parallel system, ensure that the phase sequence of the main, bypass
(10kVA/20kVA) 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 and confirm that the mains voltage and frequency are normal.
5. The output terminals of the UPS is energized upon the start-up. If the load is connected with the output terminals,
make sure that the power to the load is safe.
The output terminals of the UPS will be live upon start-up. When bypass of the single UPS in the parallel system is not
consistent, the system fault may occur, check and confirm the bypass before power-on.
3.4.2

Parallel System Parameters Setting

The parallel parameters for all the UPSs in the parallel system should be set. As shown in Figure 3-5.
Vertiv|Liebert® S600 10kVA ~ 20kVA UPS | User Manual
Figure 3-4
Internal connection diagram for positive battery string and negative battery string
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