Delta 1.07 VFD-D D - Manual (Page 116)

Chapter 5 Troubleshooting |DD Series
5-11
5-10 Fail to Adjust Motor Speed
Motor can run but
cannot change speed
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
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
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
No