H5 Ipm Protection - Toyotomi KURO Mini Service Manual

TOYOTOMI
Troubleshooting：
3.4.19 ―H5‖ IPM Protection
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display
Error judgment condition and method:
When power is connected and drive chip received IPM lead F0 that is of low level, than it is IPM module
malfunction. System will shut down for protection.
Possible reason:
■ Compressor 3-phase wire connection is lack of phase or phase-reversed.
■ System is overloaded and compressor current is too large.
■ Drive board IPM module is damaged.
■ Drive board IPM module's 15V power supply is lower than 13.5V.
■ Drive board 6-line PWM signal and the corresponding element are abnormal.
■ Drive board compressor current sampling circuit element is damaged or drive chip current sampling AD terminal
is abnormal.
■ Compressor is damaged.
H 4
Overload
Outdoor heat exchanger is blocked
NO
Indoor heat exchanger is blocked .
NO
Ambient temperature is out of the
operation range
NO
Too much charging quantity .
NO
Error still exists ?
U-Match 5 SERIES UNIT SERVICE MANUAL
YES
Remove the obstacle
YES
Remove the obstacle
YES
Normal protection . No
need to handle it .
YES
Release a proper amount
of refrigerant
Replace the drive board
YES
Replace the compressor
57
H5