Delta Electronics VFD007S23A Motor Stalls during Acceleration, Motor does not Run as Expected

Chapter 7 Troubleshooting VFD-S Series

7.11 Motor Stalls during Acceleration

Motor stalls during acceleration

Thicken or shorten the wiring between the motor or AC motor drive

Reduce load or increase the capacity of AC motor drive

	Check if acceleration			Yes
	time is too short
			No
Check if the inertia				Yes
of the motor and load
is too high
			No
Yes		Check for low voltage
		at input
			No
Yes	Check if the load torque
	is too high

Increase setting time

Yes

Use special motor?

No

Reduce load or increase the capacity of AC motor drive

	No
			Maybe AC motor drive has
Check if the torque
		Yes	malfunction or misoperation
compensation is suitable			due to noise. Please contact
	No		DELTA
Increase torque compensation

7.12 The Motor does not Run as Expected

Motor does not run		Check Pr. 01-01 thru Pr. 01-06				No			Adjust Pr.01-01 to Pr.01-06
		and torque compensation
as expected									and lower torque compensation
		settings
			Yes
					Yes			Please use specific motor
	Run in low speed continuously
			No
				Yes
		Is load too large
							Reduce load or increase the
			No				capacity of AC motor drive
							Yes
		Check if output voltage of U, V, W								Motor has malfunction
		is balanced

No

Maybe AC motor drive has malfunction or misoperation due to noise. Please contact DELTA.

7-8 Revision August 2006, SE08, SW V2.61