GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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3.4.22 “HC” PFC Protection
Error display: ODU mainboard, IDU wired controller and IDU receiver light board will display HC
Error judgment condition and method:
After 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:
■Power grid voltage is abnormal.
■Drive board PFC module is damaged.
■Drive board IPM module’s 15V power supply is lower than 13.5V.
■Drive board PWM signal for PFC and the corresponding element are abnormal.
■Drive board PFC current sampling circuit element is damaged or drive chip current sampling AD terminal is
abnormal.
Troubleshooting：
HC
PFC protection
Normal protection
Check whether power grid voltage is
normal?
NO
Drive board PFC is damaged ?
YES
Replace the drive board .
YES
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