Delta Electronics VFD-G Motor Speed cannot be Changed, Troubleshooting, out of range upper/lower

Chapter 5 Troubleshooting

5.10 Motor Speed cannot be Changed

					Motor can run but
					cannot change speed
	Modify the setting		Yes		Check if the setting of the
					max. frequency is too low
		Yes				No
	If the setting of
				Check to see if frequency is
	Pr.05-17toPr.05-31						Yes
Yes is too high				out of range (upper/lower)				Modify the setting
				boundaries

Yes

Yes

	No				No
If finished with
						No
executing				Is it in PLC mode
		Yes
Pr.05-15
	No
If the setting of
Pr.05-00 to Pr.05-14
are the same
	No		Check if the wiring between
			MI1~MI4 to DCM is correct				No

No

Yes

Correct

wiring

Check if frequency for
each step is different	No
Yes

Press UP/DOWN key

to see if speed has Yes any change

If there is any change

of the signal that sets Yes frequency (0~10V and 0~1A)

No

Check if the wiring of external terminal is correct

Yes

Change defective potentiometer

No Check if accel./decel. time is set correctly

Yes

Please set suitable accel./decel. time by load inertia

Change frequencysetting

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

Revision July 2008, EG03, SW V1.06 5-7