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Revision August 2008, 2ELE, V1.02 5-1
Chapter 5 Troubleshooting
5.1 Over Current (OC)
ocA
ocd
OC
Over-current
during acceleration
Over-current
during deceleration
Over current
Check if there is any
between the U, V, W and motor
short circuits and
grounding
Yes
No
No
No
No No
No
Yes
Yes
Yes
Remove short circuit
or ground fault
Reduce the load or
increase the power
of AC motor drive
NoNo
Reduce torque
compensation
Reduce torque
compensation
Suitable torque
compensation
No No
No
No
No
Yes
Yes
Yes
Yes
Yes
Maybe AC motor drive
has malfunction or error
due to noise. Please
contact with DELTA.
Can acceleration
time be made longer?
Can deceleration
time be made longer?
Reduce load or increase
the power of AC motor
drive
Check braking
method. Please
contact DELTA
Reduce load or increase
the power of AC motor
drive
Has load changed
suddenly?
Check if
acceleration time
is too short by
load inertia.
Check if
deceleration time
is too short by
load inertia.
Increase accel/decel
time
Check if load is too large