38
Vertiv I Liebert ITA2 30kVA I Manual
Refer to Figure 3-6 to configure the positive battery string and negative battery string.
－
＋
－
＋
－
＋
－
……
Figure 3-6 Internal connection diagram for positive battery string and negative battery string
Close the battery MCB of each UPS.
3.5
Commissioning Parallel System
3.5.1
Check Before Start-Up
1. Check and confirm that power distribution mode of the UPS and the 1 + 1 parallel POD (if
configured) 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 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.
The output terminals of the UPS and the POD (if configured) 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.
Bettery cabinet
Bettery
module
1st block
2nd block
3rd block
16th block
BAT +
＋
BAT -
PE
-
