Delta Electronics 230V Series, 460V Series, 115V Series manual Ground Fault, Over Voltage OV

Chapter 7 Troubleshooting VFD-S Series

7.2 Ground Fault

GFF

Ground fault

7.3 Over Voltage (OV)

Is output circuit(cable or			No
motor) of AC motor drive
grounded?
		Yes
	Remove ground fault

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

Over voltage

Reduce voltage to	No Is voltage within
be within spec.		specification
			Yes

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

Has over-voltage 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

Dose OV occur when				Increase			Yes
sudden acceleration				deceleration
stops				time
		Yes			No
	Increase			Yes
	acceleration					Increase setting time
	time
		No
								Need to consider using
No	Reduce moment of load inertia							braking unit or
								DC braking
			No
							No
	Use braking unit or DC braking
				Yes

Need to check control method. Please contact DELTA.

7-2 Revision August 2006, SE08, SW V2.61