Delta Electronics VFD-EL manual Troubleshooting, Over Current OC

Chapter 5 Troubleshooting

5.1 Over Current (OC)

ocA

Over-current during acceleration

ocd

Over-current during deceleration

OC

Over current

Remove short circuit

Yes

Check if there is any short circuits and

or ground fault

grounding between the U, V, W and motor

No

No

No

Reduce the load or

Yes

increase the power

Check if load is too large

of AC motor drive

No

No

No

No Reduce torque

No Suitable torque

compensation

compensation

Yes

Yes

Reduce torque

compensation

Check if

Check if

No

No

acceleration time

deceleration time

is too short by

is too short by

load inertia.

load inertia.

Yes

Yes

Maybe AC motor drive

has malfunction or error

due to noise. Please

No

Has load changed

contact with DELTA.

suddenly?

Yes

Yes

Can acceleration

Yes

Can deceleration

time be made longer?

time be made longer?

No

No

Increase accel/decel

Reduce load or increase

time

the power of AC motor

drive

Reduce load or increase

Check braking

the power of AC motor

method. Please

drive

contact DELTA

Revision August 2008, 2ELE, V1.02 5-1