YASKAWA FSDrive-MV1000 Instructions Manual page 120

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