Airwell YEVFD Series, Service Manual

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[115] Voltage too high of DC bus line of transducer
[116] Communication abnormal between transducer (inverter module board) and control PCB
Check if voltage of power
supply is normal
Check rectifier, reactor, electrolytic
capacitor in inverter main circuit
Measure if DC bus line
voltage between P and N of
module is over 644V
Check if wire of electric box is correct
Improve power supply circuit
Correct the wiring due to diagram
Circuit of DC bus line voltage on
inverter control board abnormal,
replace inverter control board
Yes
Yes
Yes
No
No
No
Check if wire between control PCB and
inverter board is abnormal
If inverter module board is abnormal
Replace main control board
Adjust communication wire
Check if communication circuit of
main control PCB is abnormal
(if signal LED flashes abnormally)
Solve the failures due to relative
information
Detecting circuit on inverter board
broken down, replace inverter
module board
Yes
Yes
Yes
No
No
No
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