GREE U-Match 6 SERIES UNIT SERVICE MANUAL
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3.4.18 “PA” AC Current Protection
Error display:
ODU mainboard, IDU wired controller and IDU receiver light board will display PA
Error judgment condition and method:
If input current value exceeds the set protection value, then it can be judged that AC current
protection occurs and system will shut down for protection.
Possible reason:
■System is heavy-loaded and compressor current is too large.
■Grid voltage is abnormal.
■PFC module is damaged.
■Drive board PFC current sampling circuit element is damaged or drive chip PFC current sampling
AD terminal is abnormal.
Troubleshooting:
3.4.19“PL” Bus Low-Voltage Protection
Error display:
ODU mainboard, IDU wired controller and IDU receiver light board will display PL
Error judgment condition and method:
When compressor is running and there is no other malfunction, if busbar voltage is lower than the set
value for low voltage protection, then it can be judged that bus low-voltage protection occurs. System will
shut down for protection.
Possible reason:
■Voltage of power grid is abnormal.
■Drive board busbar voltage sampling circuit element is damaged or drive board busbar voltage
sampling AD terminal is abnormal.
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