Airwell YEVFD Series, Service Manual

Page: 81 / 92

[120] Power supply of transducer abnormal
[121] Power supply of inverter board is 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
DC bus line voltage circuit on
inverter board broken down,
replace inverter module board
Adjust or replace relay
or AC contactor
Correct the wiring due to diagram
Improve power supply circuit
Yes
Yes
Yes
Yes
No
No
No
No
No
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
Improve power supply circuit
Adjust communication wire
Replace power module
Yes
Yes
Yes
Yes
No
79