Huawei FusionModule1000A20 Maintenance Manual page 54

FusionModule1000A20 CT Solution
Maintenance Guide
Alarm
Item
Rectifie
r
Missing
Rect
Comm
Fault
BLVD
Disconn
ected
LLVD
Disconn
ected
Issue 01 (2019-02-25)
Severity Possible
Causes
Major  Certain
rectifiers are
not powered
on.

The rectifier
is faulty.

The subrack
or slot
connector is
faulty.
 The
monitoring
unit is faulty.
Major  The rectifier
is removed.
 The rectifier
is in poor
contact.
 The rectifier
is faulty.
Major  An AC power
failure occurs.
 Batteries are
manually
disconnected.
 The battery
disconnection
voltage is set
too high on
the SMU.
Major  An AC power
failure occurs.

Loads are
manually
disconnected.
 The load
disconnection
voltage is set
too high on
the SMU.
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Solution
1. Check whether the rectifier circuit breakers
corresponding to undetected rectifiers are
ON. If no, switch them on.
2. Check whether the rectifier is removed. If
yes, find the cause and reinstall it.
3. Replace the rectifier if it is faulty.
4. Check whether certain rectifiers in the
rectifier subrack do not work properly. If
yes, remove the rectifiers that do not work
and check whether their slot connectors are
damaged or deformed. If yes, repair or
replace the subrack or slot connectors.
5. If the alarm persists after the preceding
measures are taken and the monitoring unit
is restarted, replace the monitoring unit.
1. Check whether the rectifier is removed. If
yes, reinstall it.
2. If the rectifier is in position, remove the
rectifier and reinstall it.
3. If the alarm still exists, replace the rectifier.
1. Check whether an AC power failure occurs.
If yes, resume the AC power supply.
2. Check whether batteries are manually
disconnected. If yes, confirm the reason of
the manual disconnection, and reconnect the
batteries after the operation.
3. Check whether the battery disconnection
voltage (43.2 V DC by default) is set too
high on the SMU. If yes, adjust it to a
proper value.
1. Check whether an AC power failure occurs.
If yes, resume the AC power supply.
2. Check whether loads are manually
disconnected. If yes, confirm the reason of
the manual disconnection, and reconnect the
loads after the operation.
3. Check whether the load disconnection
voltage (44 V DC by default) is set too high
on the SMU. If yes, adjust it to a proper
value.
4 Alarms and Faults
47