Delta Electronics Motor Speed cannot be Changed, Troubleshooting VFD-S Series, boundaries

Chapter 7 Troubleshooting VFD-S Series

7.10 Motor Speed cannot be Changed

Motor can run but cannot change speed

Modify the setting

Yes

If the setting of

Pr.5-09 to Pr.5-16 Yes is too high

Yes Check if the setting of the
max. frequency is too low
	No
Check to see if frequency is		Yes
out of range (upper/lower)			Modify the setting
boundaries

Yes

Yes

No

If finished with executing Pr.5-07

No

If the setting of Pr.5-00 to Pr.5-06 are the same

No

		No
	Is it in PLC mode		No
Yes

Check if the wiring between
M0~M5 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

4-20mA)

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 frequency setting

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

Revision August 2008, SE09, SW V2.61 7-7