Solutions For The Main Earth Leakage Breaker Trip - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[8-10 Troubleshooting Inverter Problems ]
8-10-17

Solutions for the Main Earth Leakage Breaker Trip

Measure the secondary voltage of the main power earth leakage breaker before checking because the main power earth leak-
age breaker may have been broken.
Items to be checked
[1] Check the earth leakage breaker
capacity and the sensitivity cur-
rent.
[2] Check the resistance at the power
supply terminal block TB1 with a
megger.
[3] Disconnect the compressor wir-
ings and check the resistance of
the compressor with a megger.
[4] Disconnect the fan motor wirings
and check the resistance of the fan
motor with a megger.
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.
50
- chapter 8
Phenomena
Use of a non-specified earth
leakage breaker
Failure resistance value
Failure compressor if the insu-
lating resistance value is not in
specified range.
Failure when the insulating re-
sistance value is 1 MΩ or less.
Failure fan motor if the insulat-
ing resistance value is not in
specified range.
Failure when the insulating re-
sistance value is 1 MΩ or less.
Remedy
Replace with a regulation earth leakage
breaker.
Check each part and wiring.
Refer to the following page(s). [8-10-18
Simple Check on Inverter Circuit Compo-
nents]
IGBT module
Rush current protection resistor
Electromagnetic relay
DC reactor
Check that there is no liquid refrigerant in
the compressor. If there is none, replace
the compressor.
Replace the fan motor.
BS_08_L