Delta VFD-B User Manual

Chapter 7 Troubleshooting |VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00 7-7
7.10 Motor Speed cannot be Changed
Motor can run but
cannot change speed
Yes
Yes
Yes
Ye s
Yes
Yes
Yes
Yes
Ye s
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
Ye s
No
Yes
If the setting of
Pr.05-17toPr.05-31
is too high
Yes
If finished with
executing
Pr.05-15
If the setting of
Pr.05-00 to Pr.05-14
are the same
Is it in PLC mode
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
M1~M6 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

Delta VFD-B Specifications

General

Series	VFD-B
Power Range	0.4kW to 15kW
Control Method	V/F Control, Sensorless Vector Control
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Communication	RS-485
Protection Features	Over-voltage, Over-current, Overheat, Under-voltage, Ground fault, Short circuit