Chapter 7 Troubleshooting

7.1 Over Current (OC)

ocA

Ov er-cur re nt

dur ing ac c eleratio n

o cd

Over- c ur rent

dur ing decele ration

OC

Ove r curren t

Remove short c ircuit Yes

or groun d fault

Reduce the load or

Ye s

increase the power

of AC motor drive

Check if there is any short c irc uits and

groun ding between t he U, V, W and motor

No

No

No

Check if load is too large

No

No

No

N o Reduce tor que

compen sation

Yes

No Suitable tor que

c o m pe n s a ti o n

Ye s

Red uce tor que

com pensa tion

Check if

Check if

No acceler ation time No dec eleration time

is too short by

is too short by

load inertia.

loa d inertia.

Ye s

Maybe AC motor dri ve

has malfunction or error

due to noise. Pleas e

contact DELTA.

Ye s

No Has l oad cha nged

s u d de n l y ?

Ye s

Ye s

Inc re ase ac cel/dec el

ti m e

Can ac celerati on

Yes Can dec elerati on

time be made longer?

time be made l onger?

No

No

R educe load or increase

t he pow er of AC motor

driv e

Reduce lo ad or in crease

t he pow er of AC motor

dri ve

Check br ake

me thod. P lease

co ntact D ELTA

Revision July 2008, BE16, SW V4.08 & V5.00

7-1