Huawei FusionModule1000A20 Maintenance Manual page 56

FusionModule1000A20 CT Solution
Maintenance Guide
Alarm
Item
Phase
A/B/C
Failure
DC
Over
Volt
DC
Under
Volt
Issue 01 (2019-02-25)
Severity Possible
Causes
Major  The AC input
power cable
is faulty.
 The rectifier
is in poor
contact.

The
monitoring
unit is faulty.

Major The DC
overvoltage
alarm
threshold is
not set
properly on
the SMU.

The power
system
voltage is set
too high in
manual mode.
 Rectifiers are
faulty.

Major An AC power
failure occurs.

The DC
undervoltage
alarm
threshold is
not set
properly on
the SMU.

The system
configuration
is not proper.

The power
system
voltage is set
too low in
manual mode.
 Rectifiers are
faulty.
Copyright © Huawei Technologies Co., Ltd.
Solution
1. Check whether the AC input power cable is
correctly and securely installed. If no,
reinstall the cable. If the insulation layer
deteriorates, replace the cable.
2. Check whether a short circuit occurs in the
AC input power cable or the insulation layer
is damaged. If yes, replace the cable.
3. If the AC input is normal and the Alarm
indicators on certain rectifiers are steady
yellow, reinstall the rectifiers.
4. If the alarm persists, replace the monitoring
unit.
1. Check whether the DC overvoltage alarm
threshold (58 V DC by default) is properly
set. If no, adjust it to a proper value.
2. Check whether the system voltage is set too
high in manual mode. If yes, confirm the
reason and adjust the voltage to normal after
the operation.
3. Remove the rectifiers one by one and check
whether the alarm is cleared. If the alarm
still exists, reinstall the rectifier. If the alarm
is cleared, replace the rectifier.
1. Check whether an AC power failure occurs.
If yes, resume the AC power supply.
2. Check whether the DC undervoltage alarm
threshold (45 V DC by default) is properly
set. If no, adjust it to a proper value.
3. Check whether the load current is greater
than the current power system capacity. If
yes, expand the power system capacity or
reduce the load power.
4. Check whether the system voltage is set too
low in manual mode. If yes, confirm the
reason and adjust the voltage to a proper
value after the operation.
5. Check whether the power system capacity is
insufficient for the loads due to rectifier
failures. If yes, replace the faulty rectifier.
4 Alarms and Faults
49