Delta 1.07 VFD-D D User Manual download pdf (Page 116)

Chapter 5 Troubleshooting |DD Series

5-11

5-10 Fail to Adjust Motor Speed

Motor can run but

cannot change speed

Yes

Check if the setting of the

max. frequency is too low

If the setting of frequency

is out of range(upper/lower)

bound

Modify the setting

Yes

If the setting of

Pr.04-00 to Pr.04-14

are the same

Press UP/DOWN key

to see if speed has

any change

If there is any change

of the signal that sets

frequency (-10V-10V

and 4-20mA)

Check if the wiring between

MI1~MI8 to COM is correct

Connect

correctly

Check if frequency for

each step is different

Check if the wiring of

external terminal is correct

Change frequency setting

If accel./decel. time

is very long

Please set suitable

accel./decel. time by

load inertia

Maybe AC motor drive has malfunction or misoperation

due to noise. Please contact DELTA.

Change defective

potentiometer

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Delta 1.07 VFD-D D User Manual Page 116