Ground Fault; Over Voltage - Delta VFD-B Series Manual

Chapter 7 Troubleshooting

7.2 Ground Fault

GFF
Ground fault
7.3 Over Voltage (OV)
Reduce voltage to
be within spec.
Maybe AC motor drive
has malfunction or
misoperation due to
noise. Please contact
with DELTA.
Reduce moment
of inertia
7-2
VFD-B Series
If output circuit(cable or
motor) of AC motor drive
is grounded?
Remove grounding
No
If voltage is within
specification
If over-voltage is occurred without load
When OV occurs, check if the
No
voltage of DC BUS is greater
than protection value
Yes
If OV occurs when
No
sudden acceleration
stops
Yes
Increase
acceleration
time
No
No
Reduce moment of load inertia
Use braking unit or DC braking
Need to check control method. Please contact with DELTA.
No
Yes

Over voltage

Yes
No
Yes
Increase
deceleration
time
No
Yes
Increase setting time
No
Yes
Maybe AC motor drive has
malfunction or misoperation
due to noise. Please
contact with DELTA.
Yes
Yes
Need to considerate to
use braking unit and
DC braking
No
Revision 10/2005, BE13, SW V4.08