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Chapter 7 Troubleshooting |VFD-S Series
7-2 Revision August 2006, SE08, SW V2.61
7.2 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.
7.3 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
with 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 braking unit or DC braking
Need to check control method. Please contact DELTA.
Need to consider using
braking unit or
DC braking