ABB ACS880 Series, Supplement Manual

Page: 26 / 50

22 Decanter program features
Decanter process load compensation
The load compensation of Scroll drive enables compensating the process load variations
of a Decanter. This means that, it is possible to influence the quality of the end product
automatically through a differential speed correction. See the below chain diagram and
parameters
78.17 Load compensation gain and 78.18 Load compensation int time .

Torque window control
The operating principle of the Torque window control is based on the window control of the
actual torque. The control is activated when the actual torque of the scroll drive exceeds
the given reference.
Differential speed correction can be adjusted with separate integrator, gain and scaling
factors of the Torque window control using following parameters:
78.12 Torque window sel
78.13 Torque ref select
T
O
RQ
UE
WI
N
D
O
W
CO
NT
RO
L
P I
7
8
.14
T
or
que r
e
fe
renc
e
Va
lu
e
7
8
.15
T
or
que gai
n
Va
lu
e
7
8
.16
T
or
que i
n
tegr
at
ion t
ime
Va
lu
e
Va
lu
e
3
.05
F
iel
dbus
A
r
e
f
1
Va
lu
e
12
.22 S
cal
ed
A
I2
Va
lu
e
12
.12 S
cal
ed
A
I1
7
8
.13
T
or
que w
indow
r
e
f s
e
l
S
e
le
c
tio
n
>
0
7
8
.12
T
or
que w
indow
s
e
l
S
e
le
c
tio
n
>
Va
lu
e
7
8
.19
T
or
que t
o
de
lt
a s
peed
+
9
.21
D
e
lta s
peed t
o
rque w
indow
LO
A
D
C
O
M
PEN
SAT
IO
N
CO
NT
RO
L
P I
Va
lu
e
7
8
.17
Load c
o
mpens
at
ion gai
n
Va
lu
e
7
8
.18
Load c
o
mpens
at
ion i
n
t t
ime
Va
lu
e
1
.1
0
M
o
to
r
to
rq
u
e
9
.23 Load
co
mpens
at
io
n
D
e
c
ant
e
r c
ont
rol t
o
rq
ue
w
indow
and load
c
o
m
pens
at
ion
0 1
EN
AN
D
0
a>b
a b
T
or
que t
o
s
peed c
o
mp