Chapter 7 Troubleshooting; Over Current (Oc) - Delta VFD-B Series Manual

7.1 Over Current (OC)

Remove short circuit
or ground fault
Reduce the load or
increase the power
of AC motor drive
No Reduce torque
compensation
Yes
Reduce torque
compensation
Maybe AC motor drive
has malfunction or error
due to noise. Please
contact with DELTA.
Increase accel/decel
time
Revision 10/2005, BE13, SW V4.08
ocA
Over-current
during acceleration
Yes
Check if there is any
grounding
No
Yes
No
No
Suitable torque
compensation
Yes
Check if
No
acceleration time
is too short by
load inertia.
Yes
Yes
Can acceleration
time be made longer?
No
Reduce load or increase
the power of AC motor
drive

Chapter 7 Troubleshooting

ocd
Over-current
during acceleration
short circuits and
between the U, V, W and motor
No
If load is too large
No
Check if
No
deceleration time
is too short by
load inertia.
Yes
No
Yes
Can deceleration
time be made longer?
No
Reduce load or increase
the power of AC motor
drive
Check braking
method. Please
contact with DELTA
OC
Over current
No
No
Is load changed
suddenly?
Yes
7-1