PID parameter group 08
PARAMETER DESCRIPTION 230
5.9.3 PID parameter group 2
This group of parameters is only related to close loop tension mode.
Parameter
Name
Default Setting Range
Content
08-20
P.641
Proportional gain P2
20.0%
0.1%～1000.0%
This gain determines the proportion controller’s response on
feedback deviation. The greater the gain, the faster the
response. Gain set too high will cause vibration.
08-21
P.642
Integral time I2
1.00s
0～60.00s
This parameter determines integral controller’s integral time.
When integral gain is too high, integral effect will be too
weak to eliminate steady state deviation. When integral gain
is rather small, the system vibration time will increase, and
too small integral gain will cause system unstable.
08-22
P.643
Differential time D2
0ms
0～10000ms
This gain determines deviation controller’s response to
deviation change rate. Appropriate deviation time can
reduce overshooting and vibrating between proportion
controller and integral controller. Deviation time set too long
will cause system vibration.
08-23
P.644
Auto adjustment for
PID parameters
0
0
Adjust according to the feedback deviation value
1
Adjust according to the curling radius.
2
Adjust according to the operation frequency.
3
Adjust according to the line speed.
PID parameter group 2
08-23(P.644) sets auto adjustment basis for PID parameters.
1.
08-23(P.644)=0, adjust according to feedback deviation value. 08-33 (P.720) = 1, the first group of PID is on
when deviation is <08-34 (P.721); the second group of PID functions is on when deviation is> 08-35 (P.722);
the deviation is between, PID parameters change linearly between two groups of parameters; when 08-33
(P.720) = 0, only the first group of PID parameters is on.
2.
08-23(P.644)=1, adjust according to curling radius. The first group of PID parameters is used for empty roll,
while the second group of PID parameters is used for full roll. The PID parameters change continuously
during the process.
3.
When 08-23(P.644)=2, adjust according to operation frequency. This first group of PID parameters is used
upon zero speed, while the second group of parameters is used upon maximum frequency. The PID
parameters change continuously during the process.
4.
When 08-23(P.644)=3, adjust according to line speed. This first group of PID parameters is used upon zero
speed, while the second group of parameters is used upon maximum line speed. The PID parameters change
continuously during the process.
The relationship between PID auto adjustment basis and PID parameters is shown as following diagram:
Auto adjustment basis
for PID parameters
PID Paraneters
08-20(P.641)/
08-21(P.642)/
08-22(P.643)
08-04(P.172)/
08-05(P.173)/
08-06(P.174)
The minimum
adjustment basis
Adjustment basis
during the process
The maximum
adjustment basis
D
ch
an
ge
s f
ro
m
08
-0
6(P
.17
4)
to 0
8-
22
(P
.64
3)
lin
ea
rly
I c
ha
ng
es
fro
m
08
-0
5(P
.17
3)
to 0
8-
21
(P
.64
2)
lin
ea
rly
P c
ha
ng
es
fro
m
08
-0
4(P
.17
2)
to 0
8-
20
(P
.64
1)
lin
ea
rly
Setting
