Delta Electronics AC Motor Drive VFD-G, User Manual

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Chapter 5 Troubleshooting
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5-2 Revision July 2008, EG03, SW V1.06
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
Does 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