Revision April 2009, SW V1.00
7-1
Chapter 7 Troubleshooting
7.1 Over Current (OC)
ocA
o cd
O C
Ov er-cur re nt
dur ing ac c eleratio n
Over- c ur rent
dur ing decele ration
Ove r curren t
Check if there is any
between t he U, V, W and motor
short c irc uits and
groun ding
Yes
No
No
No
No
No
No
Yes
Ye s
Yes
Remove short c ircuit
or groun d fault
Reduce the load or
increase the power
of AC motor drive
No
N o Reduce tor que
compen sation
Red uce tor que
com pensa tion
Suitable tor que
compensation
No
No
No
No
No
Ye s
Yes
Ye s
Yes
Yes
Maybe AC motor dri ve
has malfunction or error
due to noise. Pleas e
contact DELTA.
Can ac celerati on
time be made longer?
Can dec elerati on
time be made l onger?
Reduce lo ad or in crease
the power of AC motor
dri ve
Check br ake
me thod. P lease
co ntact D ELTA
Reduce load or increase
the power of AC motor
driv e
Has l oad cha nged
suddenly?
Check if
acceler ation time
is too short by
load inertia.
Check if
dec eleration time
is too short by
loa d inertia.
Inc re ase ac cel/dec el
time
Check if load is too large
