Chapter 3 Parallel UPS Installation And Commissioning 33
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
Note
1. For the parallel system using the shared battery strings, make sure that the LCD settings are correct. Refer to
3.5.2 Parallel
System Parameters Settings
for details.
2. For the parallel system using the shared battery strings, the ‘Single Group Batt Cap’ on the LCD setting of each UPS stands for
total capacity of the battery strings, and each UPS can calculate the shared battery capacity automatically.
ITA 016 kVA
Settings
Unit 1#
1
Single Group Batt Cap 0014
Battery Cells Number 32
ESC
1
Communication address
0014
30 32 34 36 38 40
14:30:36
ITA 016 kVA
Settings
Unit 1#
Enabled Disabled
System Configuration Parallel
Parallel requisite units 4
ESC
Disabled
Shared Battery
1 2 3 4
Single Parallel
14:30:36
Figure 3-7 Settings interface
3. Close the battery MCB of each UPS.
3.5 Commissioning Parallel System
3.5.1 Check Before Start-Up
1. Check and confirm that the power distribution mode of the UPS and the 1 + 1 parallel POD (if configured) is correct;
that the 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 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 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 and the 1 + 1 parallel POD (if configured) are energized upon the start-up. If the
load is connected with the output terminals, make sure that the power to the load is safe.
Warning
The output terminals of the UPS and the POD (if configured) will be live upon the start-up. When the 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.
3.5.2 Parallel System Parameters Setting
The parallel parameters for all the UPSs in the parallel system should be set. Power to each UPS of the parallel
system according to step 1) ~ step 4) in
3.5.3 Power-On Commissioning For Parallel System
, it is prohibited to start
the inverter. Press the menu key to enter the Settings option, set the parallel parameters according to Table 3-3.
