Huawei FusionModule1000A20 Maintenance Manual page 68

FusionModule1000A20 Prefabricated All-in-One
Data Center
Maintenance Guide
Symptom Alarm
Active/
Standby
Input
Overvoltage,
Undervoltag
e,
Overfrequen
cy, or
Underfreque
ncy
Active/
Standby
Input Open
Phase
Issue 03 (2022-12-15)
Possible
Cause
● Active
input
overvolta
ge or
undervolt
age
● Standby
input
overvolta
ge or
undervolt
age
● Active
input
overfrequ
ency or
underfreq
uency
● Standby
input
overfrequ
ency or
underfreq
uency
The active
or standby
input has an
open phase.
Copyright © Huawei Digital Power Technologies Co., Ltd.
5 Common Faults and Troubleshooting Measures
Solution
1. Use a multimeter to measure the two power
inputs and check whether the power supplies are
normal. If they are abnormal, check the upstream
power loop and rectify any faults until the power
supplies recover.
2. If the power supplies are normal, the ATS
controller is faulty. Replace the 8D controller by
following 1 to 5.
1. Use a multimeter to measure the two power
inputs and check whether the power supplies are
normal. If they are abnormal, check the upstream
power loop and rectify cable connection faults
until the power supplies recover.
2. If the power supplies are normal, check whether
the ATS input screws are properly installed.
3. If the alarm persists, the ATS controller is faulty.
Replace the 8D controller by following 1 to 5.
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