2. Check that no alarm is generated for any UPS and perform subsequent
operations. If an alarm is generated, follow the troubleshooting suggestion to
clear the alarm rst.
Step 9 Measure the bypass input voltage of each UPS.
1. Check that no Bypass abnormal alarm is generated for any UPS in the
system. Then, none of the UPSs supplies power.
2. Set the multimeter to the AC voltage position, connect the red probe to UPS 1
bypass input phase A, and connect the black probe to UPS 2 bypass input
phase A to measure the bypass input voltage dierence between UPSs.
Perform the same operations on phases B and C. Complete the measurement
between every two UPSs in the parallel system. If the phase sequence is
correct and the voltage dierence is less than 5 V, perform the subsequent
operations. If the phase sequence is incorrect or the voltage dierence for a
phase between any two UPSs is greater than 5 V, power o the parallel
system completely, and check whether the bypass input cables for the UPS
parallel system are properly connected.
Exercise caution when performing operations with power on. There are many
electried parts in the UPS wiring area. It is recommended that the test be
performed in the external power distribution area of the UPS.
Step 10 Clear the EPO state of each UPS. For details, see 9.6 Clearing the EPO State.
Step 11 Measure the output voltage of each UPS.
1. Check that no Bypass abnormal alarm is generated for any UPS in the
system. Then, all UPSs in the system supply power in bypass mode.
2. Set the multimeter to the AC voltage position, connect the red probe to UPS 1
output phase A, and connect the black probe to UPS 2 output phase A to
measure the output voltage dierence between UPSs. Perform the same
operations on phases B and C. Complete the measurement between every
two UPSs in the parallel system. If the phase sequence is correct and the
voltage dierence is less than 5 V, perform the subsequent operations. If the
phase sequence is incorrect or the voltage dierence for a phase between any
two UPSs is greater than 5 V, power o the parallel system completely, and
check whether the output cables for the UPS parallel system are properly
connected.
Exercise caution when performing operations with power on. There are many
electried parts in the UPS wiring area. It is recommended that the test be
performed in the external power distribution area of the UPS.
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.
UPS5000-A-(30 kVA-120 kVA)
User Manual 6 Parallel System Commissioning
Issue 17 (2024-02-21) Copyright © Huawei Digital Power Technologies Co., Ltd. 135
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