7.10 Motor Speed cannot be Changed

Motor can run but

cannot change speed

Chapter 7 Troubleshooting |VFD-B Series

Modify the setting

Yes

If the setting of

Pr.05-17toPr.05-31

Yes is too high

No

Yes If finished with

executing

Pr.05-15

No

Yes Check if the setting of the

max. frequency is too low

No

Check to see if frequency is

out of range (upper/lower)

Yes

boundaries

No

Yes Is it in PLC mode No

Yes If the setting of

Pr.05-00 to Pr.05-14

are the same

Modify the setting

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 between

No

M1~M6 to DCM is correct

Yes

No

No Check if the wiring of

external terminal is correct

Check if frequency for

each step is different

Correct

wiring

No

Yes

Change defective

potentiometer

Yes

No Check if accel./decel.

time is set correctly

Change frequencysetting

Yes

Please set suitable

accel./decel. time by

load inertia

Maybe AC motor drive has malfunction or misoperation

due to noise. Please contact DELTA.

Revision July 2008, BE16, SW V4.08 & V5.00

7-7