Chapter 5 Methods of Anomaly Diagnosis | VFD-VJ
5-19
5-2 Dynamic fault processing and troubleshooting
5-2-1 Over Crrent (oc)
Check for overload
Yes
No
No
Yes
ocA
Over current in
acceleration
ocd
over current in
deceleration
oc
over current
while running at
constant speed
Troubleshoot
short circuit
Check for any shorts between
motor connection terminals U,
V, and W or shorts to ground
Reduce load or
increase hybrid servo
controller capacity
It's likely hybrid servo
controller breaks down or
malfunctions due to
noise. Please contact
Delta for assistance.
5-2-2 Ground Fault (GFF)
Yes
No
GFF
Ground fault
Check if the output
circuit (cable or motor)
of hybrid servo controller
is shorted to ground
It's likely hybrid servo controller
breaks down or malfunctions
due to noise. Please contact
Delta for assistance.
Resolve
ground fault
Remove short circuit
or ground fault
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