Huawei FusionModule1000A20 Maintenance Manual page 55

FusionModule1000A20 CT Solution
Maintenance Guide
Alarm
Item
AC
Failure
AC
Over
Volt
AC
Under
Volt
Batt
Chg.
Overcur
.
Issue 01 (2019-02-25)
Severity Possible
Causes
Major  The AC input
power cable
is faulty.
 The AC input
circuit
breaker is
OFF.

The mains
grid is faulty.
Major  The AC
overvoltage
alarm
threshold is
not set
properly on
the SMU.

The power
grid is faulty.
Major  The AC
undervoltage
alarm
threshold is
not set
properly on
the SMU.
 The power
grid is faulty.

Major The rectifier
communicatio
n is
interrupted.
 Poor contact
of the SMU.
 The SMU is
faulty.
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Solution
1. Check whether the AC input cable is loose.
If yes, secure the AC input cable.
2. Check whether the AC input circuit breaker
is OFF. If yes, handle the back-end circuit
failure and then switch on the circuit
breaker.
3. Check whether the AC input voltage is
lower than 50 V AC. If yes, handle the
mains grid fault.
1. Check whether the AC overvoltage alarm
threshold is properly set. If no, adjust it to a
proper value.
2. Check whether the AC input voltage
exceeds the AC overvoltage alarm threshold
(280 V AC by default). If yes, handle the
AC input fault.
1. Check whether the AC undervoltage alarm
threshold is properly set. If no, adjust it to a
proper value.
2. Check whether the AC input voltage is
below the AC undervoltage alarm threshold
(180 V AC by default). If yes, handle the
AC input fault.
1. Check whether an alarm is generated for
rectifier communication interruption. If yes,
remove the rectifier and reinstall it to check
whether the alarm is cleared. If the alarm
still exists, replace the rectifier.
2. Remove the SMU and reinstall it to check
whether the alarm is cleared. If the alarm
still exists, replace the SMU.
4 Alarms and Faults
48