Alarms and troubleshooting suggestions [User Guide]

Alarms and troubleshooting suggestions

When an alarm occurs, refer to the following table for possible causes and suggested remedies.

Alarm	Possible Cause	Suggested remedy
DC Over voltage	Deceleration time is too short compared to load inertia.	Increase deceleration time
DC Over voltage	The input voltage is too high.	Check if the input voltage is above the Clean Power VFD specifications.

Alarm	Possible Cause	Suggested remedy
DC Under Voltage	The input voltage is too low.	Check if the input voltage is below the Clean Power VFD specifications.
DC Under Voltage	If there's a contactor upstream of the Clean Power VFD, it may be defective.	Check operation and connection of the upstream contactor. If defective, replace it.

Alarm	Possible Cause	Suggested remedy
Drive over temperature	There is a problem with the Clean Power VFD cooling.	Check if a foreign object is obstructing the air inlet or outlet.
	The cooling fan is defective.	Replace the fan.
	The ambient temperature is too high.	Keep the ambient temperature below the specified max. operating temperature of the Clean Power VFD.

Alarm	Possible Cause	Suggested remedy
Faulty cooling fan	A foreign object is obstructing the fan's air vent.	Remove the foreign object from the air inlet or outlet.
Faulty cooling fan	The cooling fan needs to be replaced.	Replace the fan.

Alarm	Possible Cause	Suggested remedy
Motor Over current	Short-circuit detected on motor.	Check if there is any short circuits and grounding between the U, V, W and motor.
	Acceleration/deceleration time is too short compared to load inertia.	Increase acceleration/deceleration time.
	The Clean Power VFD load (motor + mechanical load) is greater than the Clean Power VFD capacity.	Replace the Clean Power VFD by a model that fits the connected load.
	Torque compensation is too large.	Reduce torque compensation.
	The motor insulation is damaged.	Replace the motor.

Alarm	Possible Cause	Suggested remedy
Application overload.	The load is greater than the motor capacity.	Replace both motor and Clean Power VFD to fit the application load constraints.
	The set value for overload alarm is too low.	Increase the set value for overload alarm.
	The torque boost value is too high.	Decrease the torque boost value.

Alarm	Possible Cause	Suggested remedy
Motor current unbalanced	Increase of current to at least one winding raising that winding temperature.	Potential single phase load connected on one of the Clean Power VFD output.Check and fix the wiring

Alarm	Possible Cause	Suggested remedy
Motor phase loss	The output wiring is faulty.	Check output wiring on Clean Power VFD side and motor side.
Motor phase loss	If you use a contactor between the Clean Power VFD and the motor, it may be defective.	Check the contactor wiring.Replace the contactor.

Alarm	Possible Cause	Suggested remedy
Motor overtemperature	The motor has overheated.	Reduce the load or operating frequency.
	The PTC sensor's wiring is defective.	Check the wiring of the PTC sensors.
	The PTC sensors are defective.	Disconnect the sensors from the Clean Power VFD check their resistance. If defective, replace them.

Alarm	Possible Cause	Suggested remedy
Motor ground fault	A ground fault has occurred on the output wiring.	Check output wiring on the Clean Power VFD side and motor side.
Motor ground fault	The motor insulation is damaged.	Replace the motor.

Alarm	Possible Cause	Suggested remedy
Power input Line overcurrent	The Clean Power VFD has been protected from overload and resulting overheating.	Check that the motor with its load do not exceed the overcurrent and duration limits as specified. Change the Clean Power VFD for a higher capacity Clean Power VFD.

Alarm	Possible Cause	Suggested remedy
Power input Line phase loss	The input wiring is faulty.	Check input wiring.
Power input Line phase loss	If there's a contactor upstream of the Clean Power VFD, it may be defective.	Check operation and connection of the upstream contactor. If defective, replace it.