Airwell VVFA Series Service Manual page 66

[120] Power supply of transducer abnormal
Check if voltage of power supply is normal
Check if wire of electric box is correct
If relay or AC contactor acts well
Measure if DC bus line
voltage between P and N on
module is less than 140V
Check rectifier, reactor,
electrolytic capacitor in
inverter main circuit
[121] Power supply of inverter board is abnormal
Check if voltage of power supply
on inverter control board is normal
Check if wire between control PCB
and inverter board is abnormal
If circuit of inverter control board is abnormal
Solve the failures due to relative information
Yes
Yes
Yes
Yes
Yes
Yes
No
64
No
Improve power supply circuit
No
Correct the wiring due to diagram
No
Adjust or replace relay
or AC contactor
DC bus line voltage circuit on
No
inverter board broken down,
replace inverter module board
No
Improve power supply circuit
Yes
Adjust communication wire
Yes
Replace power module