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2 ground fault, 3 over voltage (ov), 2 ground fault -2 – Delta Electronics AC Motor Drive VFD-E User Manual

Page 213: 3 over voltage (ov) -2

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Chapter 5

Troubleshooting|

5-2

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11

5.2 Ground Fault

GFF

Ground fault

No

Yes

Is output circuit(cable or

motor) of AC motor drive

grounded?

Remove ground fault

Maybe AC motor drive has

malfunction or misoperation

due to noise. Please

contact DELTA.

5.3 Over Voltage (OV)

Over voltage

Yes

No

Yes

No

No

No

Is voltage within
specification

Reduce voltage to
be within spec.

Has over-voltage occurred without load

Maybe AC motor drive
has malfunction or

misoperation due to
noise. Please contact
DELTA.

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

When OV occurs, check if the

voltage of DC BUS is greater
than protection value

Dose OV occur when

sudden acceleration
stops

Increase
deceleration
time

Increase setting time

Increase

acceleration

time

Reduce moment
of inertia

Reduce moment of load inertia

Use brake unit or DC brake

Need to check control method. Please contact DELTA.

Need to consider using

brake unit or
DC brake