Chapter 5 Troubleshooting
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5-7
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
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Check if the setting of the
max. frequency is too low
Check to see if frequency is
out of range (upper/lower)
boundaries
Modify the setting
Modify the setting
Yes
No
Yes
If the execution
time is too long
Yes
If finished with
executing PLC
program
Check if the PLC
program is correct
If the PLC program
is executed
Press UP/DOWN key
to see if speed has
any change
If there is any change
of the signal that sets
frequency (0-10V and
4-20mA)
Check if the wiring between
MI1~MI6 to DCM is correct
Correct
wiring
Check if frequency for
each step is different
Check if the wiring of
external terminal is correct
Change frequencysetting
Check if accel./decel.
time is set correctly
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
