Airwell VVFA Series Service Manual page 63

[113] Protection of overload
Check if voltage of power supply is normal
Check if wire of electric box is correct
If compressor is normal
(compressor coil resistor, insulation)
If power module is normal
Compress load too much,
check the reason
[114] Voltage too low of DC bus line of transducer
Check if voltage of power
supply is normal
Check if wire of electric box
If AC contactor or relay acts well
Measure if DC bus line
voltage between P and N of
module is less than 375V
Check rectifier, reactor, electrolytic
capacitor in inverter main circuit
Yes
Yes
Yes
Yes
Yes
is correct
Yes
Yes
Yes
No
Improve power supply circuit
No
Correct the wiring due to diagram
No
Replace compressor
No
Replace power module
No
Improve power supply circuit
No
Correct the wiring due to diagram
No
Adjust or replace relay
No
Circuit of DC bus line voltage on
inverter control board abnormal,
replace inverter control board
61