Delta Electronics VFD-VL manual Ground Fault, Over Voltage OV, Ground fault

Chapter 5 Troubleshooting

5.2 Ground Fault

GFF

Ground fault

5.3 Over Voltage (OV)

If output circuit(cable or motor) of AC motor drive is grounded?

Yes

Remove grounding

Maybe AC motor drive has No malfunction or misoperation

due to noise. Please contact DELTA.

Over voltage

Reduce voltage to	No If voltage is within
be within spec.		specification
			Yes

Maybe AC motor drive has malfunction or misoperation due to noise. Please contact with DELTA.

If over-voltage is occurred without load Yes No

No When OV occurs, check if the voltage of DC BUS is greater than protection value

YesYes

No

Reduce moment of inertia

If OV occurs when			Increase			Yes
sudden acceleration			deceleration
stops			time
		Yes		No
	Increase		Yes
	acceleration				Increase setting time
	time
		No				Need to considerate to
No
	Reduce moment of load inertia					use braking unit and
						DC braking

	No
		No
Use braking unit or DC braking
	Yes

Need to check control method. Please contact DELTA.

5-2 Revision Nov. 2008, VLE1, SW V1.03