Delta Electronics VFD-VL manual Motor Stalls during Acceleration, Motor does not Run as Expected

Chapter 5 Troubleshooting

5.11 Motor Stalls during Acceleration

Motor stalls during

Check if acceleration

Yes

Increase setting time

acceleration

time is too short

No

Yes

Check if the inertia

Yes

Use special motor?

of motor and load

are very high

No

No

Thicken or shorten the

Yes

Check if the voltage of

Reduce load or

wiring between the

terminal is lower than

increase the capacity

motor or AC motor drive

before

of AC motor drive

No

Reduce load or

Yes

Check if the load torque

increase the capacity

is too high

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

5.12 The Motor does not Run as Expected

Motor does not run		Check if V/f characteristic				No			Adjust V/f characteristic
		and torque compensation
as expected									and lower torque compensation
		is suitable
			Yes
					Yes			Please use specific motor
	Run in low speed continuously
			No
				Yes
		If load is 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.

5-8 Revision Nov. 2008, VLE1, SW V1.03