Troubleshooting - Huawei UPS5000-A-400 kVA User Manual

UPS5000-A-400 kVA
User Manual (50 kVA, PF=0.9)
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For details about how to rectify common faults, see
occur, see the alarm list chapter, or contact Huawei technical support.
Table 7-1 Solutions to common faults
Case Symptom
The The rectifier is not working,
rectifier is and the bus voltage is not
not normal. boosted.
Issue 03 (2020-01-10)
If the UPS is faulty, alarm information is displayed on the LCD. Clear critical alarms
before powering on the UPS again. Otherwise, the fault scope expands or the UPS is
damaged.
Do not clear alarms by reseating power units or the bypass unit.
Remove a faulty power unit or bypass unit after it is confirmed that the unit needs
replacing. After removing the unit, do not insert it into the UPS again.
After a UPS finishes troubleshooting and is started, if the LCD continues displaying alarm
information, choose System Info > Alarms > Clear Faults to clear the alarm and then
start the inverter.
When batteries reach EOD, the battery switch in the BCB box trips if the BCB box is
configured. To restore battery discharge, close the battery switch in the BCB box (if any)
first.
To restore battery discharge after batteries reach EOD, use one of the following methods:
1. Switch to another battery string. Ensure that each battery has a voltage greater than the
EOD voltage and 11.3 V/cell. 2. Restore the mains power supply to start the inverter.
Close the battery switch and charge batteries until each battery has a voltage greater than
the EOD voltage and 11.3 V/cell.
Copyright © Huawei Technologies Co., Ltd.
7
Possible Cause
The mains voltage exceeds
the upper threshold 280 V or
is less than the lower
threshold 80 V.

Troubleshooting

Table 7-1. If any unmentioned faults
Measure
Check whether the mains
voltage exceeds the threshold.
If yes, contact the electric
power company.
7 Troubleshooting
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