User Guide

Revision July 2008, EG03, SW V1.06 5-1
Chapter 5 Troubleshooting
5.1 Over Current (OC)
ocA
ocd
OC
Ov er-curre nt
dur ing acceleratio n
Over- c ur re nt
during decele ration
Ove r curren t
Check if there is any
bet w een t he U, V, W and mo tor
short c irc uits an d
grounding
Ye s
No
No
No
No No
No
Ye s
Ye s
Yes
Remove short c ircuit
or ground fault
Reduce the load or
increase t he power
of AC motor drive
NoNo
Reduce torque
compen sation
Reduce tor que
compensa tion
Suitable torque
compensation
No No
No
No
No
Ye s
Yes
Ye s
Yes
Yes
Maybe AC motor drive
has malfunction or error
due to noise. Please
contact DELTA.
Can acceleration
time be made longer?
Can dec e le rati on
time be made l onger?
Reduce lo ad or in crease
the power of AC mo tor
drive
Check brake
method. Please
contact D ELTA
Reduce load or increase
the power of AC motor
drive
Has l oad cha nged
suddenly?
Check if
acceleration time
is too short by
load inertia.
Check if
dec eleration time
is too short by
loa d inertia.
Incre ase accel/decel
time
Check if load is t oo larg e