GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
42
3.4.15 “PH” Bus High-Voltage Protection
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
If there is no other malfunction and the busbar voltage is higher than the set value for high voltage protection,
then it can be judged that bus high-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.
Troubleshooting
：
3.4.16 “PA” ODU AC current protection
Error display:
ODU mainboard LED displayer
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.
To Next Page
Loading...
