Parallel Ups System - ABB PowerValue 31/11 T 10 kVA User Manual

5.3.3

Parallel UPS system

Installing a new parallel system
1. Do not switch on the output breaker of each UPS. Switch on the input breaker of the each UPS and
the UPS will transfer to bypass.
2. Observe the UPS displays to check if there are warnings or fault information. Measure the output
voltage of each UPS separately to check if the voltage difference between them is lower than 1V. If
the difference is higher than 1V, check the wiring.
3. Press the power-on button of one UPS. Each UPS will start up and all of them will transfer to the
inverter at the same time.
4. Measure the output voltage of each UPS separately to check if the voltage difference between them
is lower than 0.5V. If the difference is higher than 1V, the UPSs must be regulated.
5. Press the power-on button of one UPS. Each UPS will transfer to the bypass-mode. Switch on the
output breaker of each UPS to parallel the output of all UPSs at the same time.
6. Press the power-on button of one UPS, each UPS will start up and they will work in parallel in online
mode.
Adding a UPS to an existing system
Read carefully section 5.4 before following the procedure below.
Note: The parallel system must have a main maintenance mechanical switch or static switch according
to Figure 15.
1. Regulate the output voltage of the new UPS separately: check if the output voltage difference
between the new UPS and the parallel system is lower than 0.5V.
2. Ensure that the bypass of the parallel system is working and the bypass setting is "enabled".
3. Remove the cover plate of the maintenance switch on the rear panel of each UPS. The UPS system
will transfer to bypass automatically.
4. Set the own maintenance switch of each UPS from "UPS" to "BPS".
5. Switch off the main output breaker and the main input breaker. The UPS will shut down.
6. Check that that there is no current in the output and that the UPS is switched off.
7. Add the new UPS and reinstall the new UPS parallel system by following steps 1-7 of section 4.2.2.3.
8. Switch on the main input breaker and the main output breaker, and set the main maintenance switch
or static switch from "BPS" to "UPS".
9. Set the UPS own maintenance switch from "BPS" to "UPS" and screw the maintenance cover plate
back again.
10. Press the power-on button of one UPS. Each UPS will start up and all UPSs will run in parallel in
online mode.
How to remove a single UPS from a parallel system:
Note: The parallel system must have a main maintenance mechanical switch or static switch according
to Figure 15.
1. Ensure that the bypass is working and that he bypass setting is "enabled".
2. Remove the cover plate of maintenance switch on the rear panel of each UPS. The UPS system will
transfer to bypass automatically.
3. Set the own maintenance switch of each UPS from "UPS" to "BPS".
4. Switch-off the main output breaker and the main input breaker. The UPSs will shutdown.
5. Check that that there is no current in the output and that the UPS is switched off.
6. Remove the UPS and reinstall the new UPS parallel system by following steps 1-7 of section 4.2.2.3.
7. If the removed or the remained UPS are then used in a standalone configuration, JP1 and JP2 on
the terminal block should be connected with a short connection wire.
8. Switch on the main input breaker/switch and the main output breaker/switch.
9. Set the main maintenance switch or static switch from "BPS" to "UPS" and screw the maintenance
cover plate back to the UPS.
1. Press the power-on button of one UPS. Each UPS will start-up and all UPSs will run in parallel in
online mode.
4NWP100559R0001_OPM_ABB_PVA31-11-T_10-20kVA_EN_140626
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