1 0 0
C H A N GE PARA METERS
6.8.3.1.2 Ho w to get over
l
oads greater than 1 5 0 % us
i
ng 8 2)O/LO A D % T ARGET
Use th
i
s to prov
i
de
l
arger over
l
oad percentages on motors sma
ll
er than the PL/X mode
l
rat
i
ng. Th
i
s examp
l
e
sho w s ho w 8 2)O/LO A D % T ARGET prov
i
des a 2 0 0 % over
l
oad for a 9 amp motor w
i
th a 1 2 amp PL/ X 5.
1) The current set on 2)RA TED ARM A MPS (1 2 amps) represents 1 0 0 % of the dr
i
ve (PL/X 5), but for th
i
s
app
li
cat
i
on must be de
li
berate
l
y set h
i
gher than the norma
l
fu
ll
l
oad motor current (9 amps).
2) The parameter 8 2)O/LO A D % T ARGET
i
s set at a
l
eve
l
e
qu
i
v
a
l
e
nt to th
e
no
r
m
a
l
fu
ll
l
o
a
d moto
r
c
u
rr
e
nt
. (9
amps). Here th
i
s
i
s equ
i
va
l
ent to 7 5 % of 2)RA TED ARM A MPS (1 2 amps).
3) The 1 5 0 %
li
m
i
t (1 8 amps)
i
s no w doub
l
e the 8 2)O/LO A D % T ARGET (7 5 %), w h
i
ch represents a 20 0 %
over
l
oad capab
ili
ty w
i
th respect to the fu
ll
l
oad motor current. (9 amps).
A U T O T UNE w
i
th 2)RA TED ARM A MPS = 1 2 A . See 6.8.9 C URREN T C O N TROL / A utotune enab
S
e
N 179, to
a
v
a
l
u
e
l
e
ss th
a
n 82
)
O/
L
OAD % TA
R
GET.
6.8.3.1.3 Max
i
mum over
l
oad tab
l
e
Tab
l
e sho w
i
ng max
i
mum over
l
oads accord
i
ng to:- Fu
ll
l
oad motor current, as a % of 2)RA TED ARM A MPS.
Fu
ll
l
oad motor current
(8 2)O/LO A D % T ARGE T) as
a % of 2)RA TED ARM A MPS
Max
i
mum ava
il
ab
l
e
Max
i
mum over
l
oad % ava
il
ab
l
e.
(W
i
th respect to fu
ll
l
oad motor current)
1 0 0 %
1 5 0 %
1 5 0 / 1 0 0 = 1 5 0 %
9 0 %
1 5 0 %
1 5 0 / 9 0 = 1 6 6 %
8 0 %
1 5 0 %
1 5 0 / 8 0 = 1 8 7 %
7 5 %
1 5 0 %
1 5 0 / 7 5 = 2 0 0 %
6 0 %
1 5 0 %
1 5 0 / 6 0 = 2 5 0 %
5 0 %
1 5 0 %
1 5 0 / 5 0 = 3 0 0 %
3 7.5 %
1 5 0 %
1 5 0 / 3 7.5 = 4 0 0 %
3 0 %
1 5 0 %
1 5 0 / 3 0 = 5 0 0 %
There are 2 overcurrent tr
i
p mechan
i
sms.
1) A soft w are thresho
l
d w h
i
ch
i
s set at 3 0 0 % of 2)RA TED ARM A MPS.
2) A hard w are thresho
l
d w h
i
ch act
i
vates
i
n excess of 1 5 0 % of the max
i
mum PL/X mode
l
rat
i
ng.
A U T O T U NE w
i
th 2)R A TED ARM A MPS set to
i
ts f
i
na
l
va
l
ue. See examp
l
e above for 9 amp motor.
S
e
N 179, to
a
v
a
l
u
e
l
e
ss th
a
n 82
)
O/
L
OAD % TA
R
GET.
If 3)C URREN T LIMIT(%) or 8 2)O/LO A D % T ARGET
l
eve
l
i
s set to 0 % , then no current w
ill
f
l
o w .
6.8.3.2 C URREN T O V ERLO A D / O ver
l
oad ramp t
i
me PIN 8 3
E.g. For L
i
m
i
t = 1 5 0 % , t
i
me = 2 0 secs, target = 1 0 5 % . Then ramp t
i
me to target = 9 secs (
i
e.4 5 % of 2 0 secs).
C URREN T O V ERLO A D 4
8 3)O/LO A D RA MP TIME
8 3)O/LO A D RA MP TIME
2 0.0 SE C S
PAR A ME TER
RA N GE
DEF A ULT
PIN
O/LO A D R A MP TIME
0.1 to 2 0.0 secs
2 0.0secs
8 3
Sets the t
i
me taken to reduce
the current
li
m
i
t by 1 0 0 %
1 5 0 %
1 0 0 %
5 0 %
8 2)O/LO A D % T ARGET set to 7 5.0 0 % . Eg. L
i
m
i
ts
at 9 amps w
i
th 2)RA TED ARM A MPS = 1 2 amps
W
i
th Iarm = 1 5 0 % . The 1 5 0 %
li
m
i
t
i
s ava
il
ab
l
e for 2 5 secs pr
i
or to commenc
i
ng reduct
i
on.
Eg for PL/X 5, 1 5 0 % = 1 8 amps. (For a motor rated at 9 amps, th
i
s represents 2 0 0 %).
7 5 %
8 3)O/LO A D
RA MP TIME
2)RA TED ARM A MPS.
Eg for PL/X 5 set to 1 2 amps
Equ
i
va
l
ent to PL/X 1 0 0 % .
(1 3 3 % of fu
ll
l
oad motor current)
Содержание PLX
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