TP48200A-HX09A1 and TBC300A-DCA5 Telecom
Power
User Manual
4 Maintenance
Issue 03 (2019-11-15)
Copyright © Huawei Technologies Co., Ltd.
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4.3.2 Identifying Circuit Breaker Faults
The following indicate that the circuit breaker is faulty:
The circuit breaker cannot be switched to ON/OFF after the short circuit fault for its end
circuit is rectified.
When the circuit breaker is switched to ON and its input voltage is normal, the voltage
between the two ends of the circuit breaker exceeds 1 V.
The input voltage is normal, but the resistance between both ends of the circuit breaker is
less than 1 kΩ when the circuit breaker is OFF.
4.3.3 Identifying Rectifier Faults
The following indicate that the rectifier is faulty:
The AC input and slot connector are normal, but the Fault indicator (red) is steady on or
all indicators are off.
The slot connector and SMU are normal, but the Alarm indicator (yellow) still blinks
after the rectifier is reinstalled.
The AC input and SMU are normal, but the SMU cannot control the rectifier.
4.3.4 Identifying SMU Faults
The following indicate that the SMU is faulty:
The DC output is normal but the green indicator on the SMU is off.
The SMU breaks down or cannot be started. Its LCD has abnormal display or buttons
cannot be operated.
With alarm reporting enabled, the SMU does not report alarms when the power system is
faulty.
The SMU reports an alarm when the power system is not faulty.
The SMU fails to communicate with the connected lower-level devices even though the
communications cables are correctly connected.
Communication between the SMU and all rectifiers fails even though the rectifiers and
the communications cables are normal.
The SMU cannot monitor AC or DC power distribution when communications cables are
intact and AC and DC power distribution is normal.
Parameters cannot be set or running information cannot be viewed on the SMU.
4.4 Replacing Components
4.4.1 Replacing a Rectifier
Prerequisites
You have obtained an ESD wrist strap, a pair of protective gloves, an ESD box or bag,
and the cabinet door key.
The new rectifier is intact.