Delta Electronics VFD-E manual Motor Speed cannot be Changed

Chapter 5 Troubleshooting

5.10 Motor Speed cannot be Changed

For VFD*E*C models, no PLC function is supported. Please follow the dashed line to skip the PLC parts.

Motor can run but

cannot change speed

Yes

Check if the setting of the

Modify the setting

max. frequency is too low

Yes

No

If the execution

Check to see if frequency is

Yes

Yes

time is too long

out of range (upper/lower)

Modify the setting

No

boundaries

No

Press UP/DOWN key

Yes

If finished with

Yes

executing PLC

If the PLC program

No

to see if speed has

program

Yes

is executed

any change

No

If there is any change

Yes

Yes

Check if the PLC

of the signal that sets

program is correct

frequency (0-10V and

4-20mA)

No

Check if the wiring between

No

MI1~MI6 to DCM is correct

No

Check if the wiring of

No

Yes

external terminal is correct

Correct

Yes

Check if frequency for

wiring

each step is different

No

Change defective

potentiometer

Yes

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 June 2008, 04EE, SW--PW V1.11/CTL V2.11 5-7