144
Console LED display
Cause
Where to check and how to
take actions
Reference
1. Power supply was connected
to the output of VF66B (DC
motor drive).
Check input and output
wires. After correcting
them, replace the fuse.
Chapter 2, 2.1 How
to Connect VF66B
(DC motor drive)
2. IGBT (IPM) may be damaged.
Check whether IGBT
(IPM) works properly or
not (continuity check) and
then replace the fuse.
[Contents]
<This function is applied
to models 7522, 7544 and
higher, and the unit
parallel models>
It starts when the fuse of
the main circuit
direct-current part in the
unit is blown.
* A character in the third
digit from the right
distinguishes a master
unit (n) from slave units
(1, 2, and 3).
3. The output electrical wire was
grounded or short circuited.
Check input and output
wires. After correcting
them, replace the
damaged parts and the
fuse.
4. The dynamic braking (DB)
optional unit [VFDB2009] is
damaged.
Replace the dynamic
braking (DB) optional unit
[VFDB2009].
Console LED display
Cause
Where to check and how to
take actions
Reference
1. The output electrical wire was
grounded or short circuited.
Check the output wiring.
Chapter 2, 2.1 How
to Connect VF66B
(DC motor drive)
2. The acceleration and
deceleration time is too short.
Make the acceleration and
deceleration time longer.
Chapter 3, 3.3.2 How
to Change the
Acceleration/Deceler
ation Time
3. Load capacity is abnormally
large.
･
Reduce load.
･
Check and review the
capacity of VF66B (DC
motor drive) and the
motor.
[Contents]
<Applied to the parallel
models only>
It starts when current over
290 % of the rated current
of VF66B (DC motor
drive) is applied for two or
more seconds in all units.
4. The combination of VF66B
(DC motor drive) and the
motor is incorrect.
Use a correct combination
of VF66B (DC motor drive)
and the motor.
6. The setting of current control
gain is not correct.
Adjust the current control
proportion gain (E-07) and
the current control integral
gain (E-08).
Chapter 6, 6.6
Area E
Chapter 7, 7.6
Area E
7. The unit could not be
accelerated when the motor
was started by applying the
rated voltage directly (direct
connect starting).
Stop applying the rated
voltage to the motor directly
(direct connect starting) and
change to the normal
starting.
