Liebert S600 User Manual page 33

1. Carry out the parallel commissioning after each UPS is working normally.
2. After confirming that the inverter of each UPS is normal, commission the parallel system, the specific procedures
are as follows:
a) Close the external output MCB and input MCB of each UPS, and all UPSs are powered on at the same time. After
the start of the rectifier is finished, press the power button of one UPS for two seconds, the run indicator (green) will
be on. Measure whether the inverter output voltage is normal.
b) Start the inverter of the second UPS, check whether there is an alarm on the LCD, and confirm that the UPS parallel
works normally.
c) Follow the methods to start the inverter of the third or the fourth UPS to connect the UPS into the parallel system.
3. If the user needs to add one UPS in the parallel system, follow the commissioning procedures below:
a) Check and confirm that the power distribution mode, each power cable and signal cable of the added UPS are well
connected without short circuit. Check that the battery installation and cables connection are correct without short
circuit, and that the positive and negative are correct.
b) Repeat steps a) to h) in Part 1 to complete the single unit commissioning of the added UPS. Then completely power
off the UPS.
c) Ensure that the connection of power cable and signal cable is reliable.
d) For any online UPS, enter the interface shown in Figure 3-7. Set the system parallel No. from 'N' to 'N+1', then click
the 'Sync parallel parameters'.
e) Close the external I/O switches of the added UPS, normally start the inverter after the rectifier start-up. Then check
that the LCD has no alarm, and that the UPS parallel system works normally.
1. For 1+1 parallel system, when one UPS is faulty and needs to be replaced on line, the above operation steps are
available too. The difference is no need to change parallel No., just click the 'Sync parallel parameters' for the online
UPS.
2. Clicking the 'Sync parallel parameters' to achieve the synchronization of the items in parallel settings interface, and
the parameters will affect the parallel system. The user should manually set other parameters according to actual
needs.
3. When adding a single unit in the parallel system, first ensure the parallel cables connection is correct, then power
on the single unit.
Vertiv|Liebert® S600 10kVA ~ 20kVA UPS | User Manual 33