Output Overcurrent Detection - Daikin FTXS09HVJU Service Manual

SiUS04-904

4.20 Output Overcurrent Detection

4.20.1 09/12 Class
L5
Remote
Controller
Display
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Method of
Malfunction
Detection
 A position signal error occurs while the compressor is running.
Malfunction
 A speed error occurs while the compressor is running.
Decision
 An output overcurrent input is fed from the output overcurrent detection circuit to the
Conditions
 The system is shut down if the error occurs 255 times.
 Clearing condition: Continuous run for about 10 minutes (normal)
 Overcurrent due to defective power transistor
Supposed
 Overcurrent due to wrong internal wiring
Causes
 Overcurrent due to abnormal supply voltage
 Overcurrent due to defective PCB
 Error detection due to defective PCB
 Overcurrent due to closed stop valve
 Overcurrent due to compressor failure
 Overcurrent due to poor installation condition
134
microcomputer.
Troubleshooting
Service Diagnosis