YASKAWA FSDrive-MV1000 - Page 120

5.4 Fault Detection
120 YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
Digital Operator Display Fault Name
CFA
nn OH
IGBT Overheating
A thermistor temperature of the value set for L8-02 or higher has been detected.
Cause Possible Solution
Cooling fan fault ⇒If the cooling airflow is inadequate, replace the cooling fan.
The intake filter is soiled. ⇒If the intake filter is soiled, clean it.
The heatsink of the Power Cell is soiled. ⇒Clean the heatsink of the Power Cell.
Fault of the cell control board (CCB),
thermistor or Power Cell
⇒Replace the cell control board (CCB), thermistor or Power Cell.
Parameter setting error ⇒Check the parameter settings.
Digital Operator Display Fault Name
CFA
nn OH1
IGBT Overheating 1
A thermistor temperature has exceeded the protection level.
Cause Possible Solution
Cooling fan fault ⇒If the cooling airflow is inadequate, replace the cooling fan.
The intake filter is soiled. ⇒If the intake filter is soiled, clean it.
The heatsink of the Power Cell is soiled. ⇒Clean the heatsink of the Power Cell.
Fault of the cell control board (CCB),
thermistor or Power Cell
⇒Replace the cell control board (CCB), thermistor or Power Cell.
Parameter setting error ⇒Check the parameter settings.
Digital Operator Display Fault Name
CFA
nn OV
Overvoltage 1
The P side or N side voltage in the DC bus has risen above the overvoltage detection level.
Cause Possible Solution
The deceleration time is too short. ⇒Increase the deceleration time.
The Power Cell input voltage is incorrect. ⇒Correct the Power Cell input voltage.
The Power Cell’s input power fuse has blown. ⇒Replace the Power Cell’s input power fuse.
Cell control board fault ⇒Replace the cell control board.
Digital Operator Display Fault Name
CFA
nn OV2
Overvoltage 2
The P side or N side voltage in the DC bus has risen above the overvoltage detection level.
Cause Possible Solution
The deceleration time is too short. ⇒Increase the deceleration time.
The Power Cell input voltage is incorrect. ⇒Correct the Power Cell input voltage.
The Power Cell’s input power fuse has blown. ⇒Replace the Power Cell’s input power fuse.
Cell control board fault ⇒Replace the cell control board.
Digital Operator Display Fault Name
CFA
nn THBOW
Thermistor Disconnect
The cable for the thermistor to detect temperature has been disconnected.
Cause Possible Solution
The thermistor cable is disconnected. Repair the disconnection.
The thermistor cable wiring is wrong. Correct the wiring.
Fault of the cell control board or Power Cell
⇒Replace the cell control board.
⇒Replace the Power Cell.
Digital Operator Display Fault Name
CFA
nn VCF_OV
Main Circuit Capacitor Neutral Point Potential Error
The P side or N side voltage in the DC bus has become unbalanced.
Cause Possible Solution
Deterioration of the bus’s capacitor circuit or a
Power Cell fault
⇒Replace the electrolytic capacitor.
⇒Check the balance resistance.
⇒Check the cable.
⇒Replace the cell control board.