Ground Fault; Over Voltage (Ov) - Delta VFD-BW Series User Manual

Chapter 7 Troubleshooting |VFD-BW Series

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
DELTA.
Reduce moment
of inertia
7-2
Is output circuit(cable or
motor) of AC motor drive
grounded?
Remove ground fault
No
Is voltage within
specification
Has over-voltage occurred without load
When OV occurs, check if the
No
voltage of DC BUS is greater
than protection value
Yes
No Does OV occur when
sudden acceleration
stops
Yes
Can
acceleration time
be increased?
No
No
Can moment of load inertia
be reduced?
Can brake unit or DC brake be used?
Need to check control method. Please contact DELTA.
No
Yes
Over voltage
Yes
No
Yes
Can
deceleration time
be increased?
No
Yes
No
Yes
Maybe AC motor drive has
malfunction or misoperation
due to noise. Please
contact DELTA.
Yes
Yes
Increase setting time
Need to consider using
brake unit or
DC brake
No
Revision May 2009, BWE0, SW V1.05