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User Manual 10H52188UM51 - Rev. 1 - 09/2011
Parallel UPS Installation and Commissioning
Liebert NXC
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 3-6 Settings interface
3. Close the battery MCB of each UPS.
3.4
Commissioning Parallel System
3.4.1
Check Before Power-On
1. Check and confirm that the power distribution mode of the UPS is correct; that the connections of the power cable and signal
cable 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 is correct. Especially when each UPS of the parallel system shares battery string, check these items
carefully.
3. Check all the working status of the parallel system, ensure that the phase sequence of the mains, bypass and output of each
UPS is correct and consistent, that the parallel cable connection is reliable, and that the user load is not connected during
power-on.
4. Measure and confirm that the mains voltage and frequency is normal.
5. The output terminals of the UPS are energized upon the power-on. If the load is connected with the output terminals, make
sure that the power to the load is safe.
Warning
The UPS will be live upon the power-on. When the bypass of the single unit 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 UPS units in parallel system should be set.
Power ON the each UPS of the parallel system according to step 1) ~ step 4) in 3.4.3
,
it’s prohibited to start the inverter. Press
the menu key to enter the Settings option, set the parallel parameters according to Table 3-2.
NXC 20kVA
NXC 20kVA
