User Guide

Chapter 5 Troubleshooting|
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 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
Ye s
Yes
Yes
Ye s
Yes
Ye s
Ye s
Ye s
Ye s
Ye s
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
Ye s
No
Ye s
If the execution
time is too long
Ye s
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