[8-9 Troubleshooting Inverter Problems ]
38
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chapter 8
HWE18240_GB
8 Troubleshooting Based on Observed Symptoms
8-9-12
Solutions for the Main Earth Leakage Breaker Trip
Earth leakage current measurement method
For easy on-site measurement of the earth leakage current, enable the filter with a measurement instrument that has filter
functions as below, clamp all the power supply wires, and measure.
Recommended measurement instrument: CLAMP ON LEAK HiTESTER 3283 made by HIOKI E.E. CORPORATION
When measuring one device alone, measure near the device's power supply terminal block.
Items to be checked
Phenomena
Remedy
[1]
Check the earth leakage breaker
capacity and the sensitivity cur-
rent.
Use of a non-specified earth
leakage breaker
Replace with a regulation earth leakage
breaker.
[2]
Check the resistance at the power
supply terminal block TB1 with a
megger.
Failure resistance value
Check each part and wiring.
Refer to the following page(s). [8-9-13 Sim-
ple Check on Inverter Circuit Components]
IGBT module
Rush current protection resistor
Electromagnetic relay
DC reactor
[3]
Disconnect the compressor wir-
ings and check the resistance of
the compressor with a megger.
Failure compressor if the insu-
lating resistance value is not in
specified range.
Failure when the insulating re-
sistance value is 1 M
ȍ
or less.
Check that there is no liquid refrigerant in
the compressor. If there is none, replace
the compressor.
[4]
Disconnect the fan motor wirings
and check the resistance of the fan
motor with a megger.
Failure fan motor if the insulat-
ing resistance value is not in
specified range.
Failure when the insulating re-
sistance value is 1 M
ȍ
or less.
Replace the fan motor.
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