Voltage Too High Of Dc Bus Line Of Transducer; Communication Abnormal Between Transducer And Control Pcb - Haier InoSens MRV SI AU032FSEUA Service Manual

[115] Voltage too high of DC bus line of transducer

Check if voltage of power
Check if wire of electric box is correct
Measure if DC bus line
voltage between P and N of
Check rectifier, reactor, electrolytic
capacitor in inverter main circuit
[116] Communication abnormal between transducer (inverter module board) and control PCB
Check if wire between control PCB and
inverter board is abnormal
Check if communication circuit of
main control PCB is abnormal
(if signal LED flashes abnormally)
If inverter module board is abnormal
Solve the failures due to relative
supply is normal
Yes
Yes
module is over 644V
Yes
No
No
No
information
No
Improve power supply circuit
No
Correct the wiring due to diagram
No
Circuit of DC bus line voltage on
inverter control board abnormal,
replace inverter control board
Yes
Adjust communication wire
Yes
Replace main control board
Detecting circuit on inverter board
Yes
broken down, replace inverter
module board
77