TP48200A-D14A1 Telecom Power
User Manual
5 System Maintenance
Issue 04 (2019-12-20)
Copyright © Huawei Technologies Co., Ltd.
28
Fault Type
Fault Analysis
Handling Method
Grid fault or D.G.
fault
securely connected. If the cable is not correctly and
securely connected, reconnect the cable.
2.
Check whether the AC input is available. If the AC
input is not available, check whether faults such as
short-circuit or open circuit exist on the AC input
loop. If the AC input loop is proper, contact the
mains supplier for troubleshooting. If the AC input is
from the D.G., check the D.G. by referring to the
Diesel Generator User Manual
.
3.
If the power-off duration is short, supply DC power
using batteries. If the power-off duration is long, start
other systems for power supply.
AC overvoltage and
undervoltage
Improper setting of
PMU AC
undervoltage or
overvoltage threshold
Mains supply grid
fault or D.G. fault
1.
Check whether the AC undervoltage or overvoltage
alarm threshold is properly set. If the threshold is
excessively high or low, lower or raise the threshold
according to the actual conditions.
2.
If the AC input is the mains supply, contact the
mains supplier for troubleshooting. If the AC input is
from the D.G., check the D.G. by referring to the
Diesel Generator User Manual
.
DC overvoltage and
undervoltage
Improper setting of
PMU DC
undervoltage or
overvoltage threshold
1.
Check the alarm thresholds of the DC overvoltage
and undervoltage. If the thresholds are not proper,
reset the thresholds according to the actual
conditions.
2.
When the storage battery is powering the load,
remove all the PSUs, and then insert each PSU one
by one. If an overvoltage alarm is generated after a
PSU is inserted, the voltage of the PSU exceeds the
upper threshold. Then replace the PSU.
Charging overcurrent
Communication
failure between
rectifier and PMU
Battery loop fault
1.
Check whether the rectifier module is in position or
whether contact is proper. If the PMU is inserted in
an incorrect position, insert it correctly. If the contact
is not proper, remove and then insert it.
2.
Check whether the battery loop is short-circuited or
has other faults.
3.
Check whether the batteries are faulty. If the batteries
are faulty, replace them.
Load shutdown
Load circuit breaker
set to OFF
Contactor fault
Excessively high
setting of PMU load
shutdown voltage
Output undervoltage
due to greater load
power than
configured rectifier
module power
1.
Check whether the load detection cable is securely
connected. If the cable is not connected securely,
connect it correctly.
2.
Check whether the load circuit breaker is turned off.
Checking method: Check the position of the handle
on the circuit breaker. If the circuit breaker is turned
off, turn on the circuit breaker.
3.
Check whether the contactor is faulty and whether it
can be connected and disconnected. If the contactor
is faulty, replace it.
4.
Check whether the PMU load shutdown voltage is set
excessively high. If it is set excessively high, set it
according to the actual situation.
