Over Current (Oc); Chapter 5 Troubleshooting - Delta Electronics AC Motor Drive VFD-G User Manual

5.1 Over Current (OC)

Remove short c ircuit
or groun d fault
Reduce the load or
increase the power
of AC motor drive
N o Reduce tor que
compen sation
Red uce tor que
com pensa tion
Maybe AC motor dri ve
has malfunction or error
due to noise. Pleas e
contact DELTA.
Inc re ase ac cel/dec el
time
Revision July 2008, EG03, SW V1.06
ocA
Ov er-cur re nt
dur ing ac c eleratio n
Yes
Yes
No
Suitable tor que
compensation
Yes
Check if
No
acceler ation time
is too short by
load inertia.
Yes
Can ac celerati on
time be made longer?
Reduce lo ad or in crease
the power of AC motor
dri ve

Chapter 5 Troubleshooting

o cd
Over- c ur rent
dur ing decele ration
Check if there is any
groun ding between t he U, V, W and motor
No
No
Check if load is too large
No
Ye s
Check if
No
dec eleration time
is too short by
loa d inertia.
Ye s
Yes
Can dec elerati on
time be made l onger?
No
Check br ake
me thod. P lease
co ntact D ELTA
O C
Ove r curren t
short c irc uits and
No
No
No
Yes
Has l oad cha nged
No
suddenly?
Ye s
No
Reduce load or increase
the power of AC motor
driv e
5-1