Step 12 Turn on the external output power switch for each UPS.
Check that no alarm is generated for any UPS, and then turn on the external
output power switch for each UPS.
Ensure that the output switch on each UPS is ON and the load switch is OFF.
Step 13 Tap Paral. Inv. ON on the LCD screen Common Functions. The system transfers
to inverter mode.
Step 14 Connect batteries to the parallel system.
1. Check that no alarm except the No battery alarm is displayed on the LCD of
each UPS.
2. Turn on the battery input switch for each UPS. (If there are multiple battery
strings, turn on the switch of each battery string first, and then turn on the
general switch between the battery strings and the UPS.)
3. Use a multimeter to measure the voltage where the battery switch is located
(if there are multiple battery strings, use a multimeter to measure the voltage
where each battery switch is located, and then measure the voltage where the
general battery switch is located).
4. Ensure that batteries are properly connected (the No battery alarm in the
active alarm list of all LCDs disappears within 2 minutes and no other alarms
are generated).
Step 15 Turn on the general output switch (general load switch).
NO TE
● In a parallel system, it is recommended that all racks have the same capacity. When the
system is unloaded, the load rate is displayed on the LCD of the UPS that starts first.
The load rate is not displayed after all UPSs start.
● If you connect UPSs in parallel for the first time, perform all the preceding steps. If you
need to restart the inverters after the parallel system powers off or if the parallel system
needs to transfer from bypass mode to inverter mode, you only need to tap Paral. Inv.
ON on the LCD screen Common Functions.
----End
3.2 Shutting Down and Powering Off a Parallel System
Procedure
Step 1 Choose Common Functions > Paral. Inv. OFF on the LCD. The system transfers to
bypass mode.
Step 2 Turn off the general output switch (general load switch) and the external output
power switch, battery switch, external mains input power switch, and external
bypass input power switch for each UPS.
UPS5000-A-(30 kVA–120 kVA)
Quick Guide
3 Parallel System Commissioning
Issue 14 (2022-09-06) Copyright © Huawei Digital Power Technologies Co., Ltd.
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