P6 Master Control And Driver Communication Error - Toyotomi KURO Mini Service Manual

TOYOTOMI
Troubleshooting：
Compressor over -current
P5
Compressor is running at high frequency and high load . The peak
current has reached the protection value ?
Compressor 3-phase wire connection
is correct or not?
Compressor 3-phase wires are
loose or badly connected ?
3.4.28 ―P6‖ Master Control and Driver Communication Error
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display
Error judgment condition and method:
If there is no other malfunction and the communication between master control and driver is cut off for 30s,
then it can be judged that the communication between master control and driver is faulted. System will shut down
for protection.
Possible reason:
■Communication wire between master control and driver is not well connected, or has bad contact, or is broken.
■The switch power of drive board is abnormal, therefore, the 3.3V power voltage is abnormal.
■Communication circuit of the drive board or the master control board is abnormal.
protection
NO
YES
NO
Error still exists ?
U-Match 5 SERIES UNIT SERVICE MANUAL
YES
NO
according to the correct
YES
Reconnect wires or replace
the compressor wires .
Replace the drive board
YES
Replace the compressor
65
Normal protection
Reconnnect wires
sequence.
P6