Fail To Adjust Motor Speed - Delta Electronics VFD-DD Series User Manual

5-10 Fail to Adjust Motor Speed

Modify the setting
If the setting of
Yes
Pr.04-00 to Pr.04-14
are the same
Motor can run but
cannot change speed
Check if the setting of the
Yes
max. frequency is too low
No
If the setting of frequency
is out of range(upper/lower)
bound
No
Check if the wiring between
MI1~MI8 to COM is correct
Check if frequency for
each step is different
No
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.
Chapter 5 Troubleshooting |DD Series
No
Yes
No
No
No
No
Yes
Connect
correctly
No
Yes
Change frequency setting
Yes
5-11
Modify the setting
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)
No
Check if the wiring of
external terminal is correct
Yes
Change defective
potentiometer
Yes
Yes