Samson TROVIS 6400 - Optimize the Control Parameters

6.2 Optimize the control parameters
(tune the controller to the controlled system)
In order for the controller to keep the control deviations caused by disturbances in certain limits
(or eliminate) for all setpoints, control parameters
P
,
I
,
d
and
dP
are used to adapt (tune) the
controller to the dynamic performance of the controlled system.
Note that control parameters and setpoints entered are only effective after they have been ac-
cepted and stored by pressing the yellow ENTER key (8).
P controller
— In the parameterization level, specify control parameters with
P
=
0.1
,
I
=
0
=
off
and
d
=
0
=
off
.
— In the operating level, set the setpoint to the desired value and then modify the output vari-
able using
cursor
keys (5) and such that the control valve slowly opens, and xd
becomes zero.
— Switch to
AUTOMATIC
.
— Increase P value until the controlled system inclines to oscillate.
— Slightly decrease P value until no more oscillation can be determined.
Correct offset (steady-state deviation) by setting working point
Y0
as indicated below:
In the steady-state of the plant, read the current value of output variable y and enter as
value for working point
YP
in parameterization option
YP
.
IMPORTANT:
Every change of setpoint also causes a change of working point
YP
.
PI controller
— In the paratmerization level, specify control parameters with
P
=
0.1
,
I
=
2000
(maximum)
and
d
=
0
=
off
.
— In the operating level, set the setpoint to the desired value and then modify the output vari-
able using
cursor
keys (5) and such that the control valve slowly opens, and xd
becomes zero.
— Switch to
AUTOMATIC
.
— Increase P value until the controlled system inclines to oscillate.
— Slightly decrease the P value until no more oscillation can be determined.
— Decrease I value until the system inclines to oscillate.
— Slightly increase I value until no more oscillation can be determined.
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