Current Cut - Mitsubishi Heavy Industries SRK20ZG-S Tech Manual

Current cut

Does current cut operate when
operating inverter with compressor
wire disconnected?
YES
Is output voltage applied to all 3
phases of power transistor?
YES
Is there any shortcircuit?
YES
Inspect compressor.
Trouble of outdoor unit
Does compressor operation?
YES
Is heat exchanger sensor resistance
value good?
YES
Is refrigerant amount normal?
YES
Clogged capillary tube or strainer,
defective EEV, etc.
Current safe stop
Is refrigerant charge quantity adequate?
NO
Defective inverter
NO
Defective inverter
NO
Secure space for suction
and blow out.
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 MΩ or over)
¡ Check coil wire resistance. (Few Ω)
NO
NO
NO
YES
Is outdoor ventilation condition good?
YES
Inspect compressor.
YES
Defective inverter
If check results are normal,
compressor is locked.
Is capacitor for compressor normal?
YES
Is connector for compressor connection
good?
YES
Replace compressor.
Replace heat exchanger sensor
Does trouble persist after charging gas?
YES
Insufficient gas
NO
Discharge refrigerant.
NO
Secure space for inlet and outlet.
44
- -
[Open phase on compressor output
terminal, compressor lock]
[Compressor malfunction of
insufficient gas (refrigerant)]
NO
Replace capacitor for compressor.
NO
Correct connection
NO
Check if there are any places where
gas is leaking
[Overload operation, compressor
lock, overcharge]