Start-Up Procedure; Optimization (Tuning The Process Control Station To The Controlled System) - Samson Trovis 6400 Mounting And Operating Instructions

Start-up procedure

10. Start-up procedure
Before installing or putting the process control station into operation, all characteristics of the
input and output signals and the code number have to be determined by means of the
associated soldering jumpers (see section 4., p. 14).
When all input and output connections are made and power is supplied to the process control
station, it has to be tuned for the respective control task. For this purpose, the process control
station must be configured. This can be done either manually by setting the configuration blocks
in the CONFIGURATION level (see section 6.4.), by means of a COPA pen (see section 8.), or
by using the TROVIS 6482 Configuration and Parameterization Program (see section 7.). The
configuration settings made can be recorded in a checklist given in Appendix C . The TROVIS
6482 Configuration and Parameterization Program provides the option of printing a similar
list on request. The options assigned to the individual configuration blocks are described in
more detail in Configuration manual KH 6412 E.
The parameters K , T
P
algorithm of the process control station (see section 6.13., p. 46) or in a manual optimization
procedure. The latter is described in general in the following section.

10.1. Optimization (tuning the process control station to the controlled system)

The process control station must be tuned to the dynamic behaviour of the loop, using the
parameters K , T and Tv in order to compensate for control deviations caused by disturbances
P N
by reducing these to zero or maintain them in very confined limits.
If you do not have previous experience in selecting values for the control loop, proceed
according to the following basic procedure:
The connected control valve must be closed, before starting the optimization.
1. Switch the MANUAL/AUTOMATIC mode selector key (E) to MANUAL mode. The
symbol comes up on the display.
2. Hold down the (H) key until only the first bar of the bar graph for the output variable (14)
is displayed.
3. Proceed according to the control mode selected (see below).
Proportional (P) controller
– Specify K = 0.1 in the PARAMETER level.
P
– Enter the desired value of the set point (reference variable) in the OPERATING level.
– Then modify the output variable by pressing the (G) key until the control valve slowly opens
and the error X
d
– Switch over to AUTOMATIC mode by pressing the MANUAL/AUTOMATIC key.
– Increase the K
P
– Slightly reduce the K
– Eliminate steady-state deviation as follows: Switch the controller to the MANUAL mode.
Modify the output variable until the error X
and enter this value for parameter K
Important: Any modification of the set point (reference variable) causes a change of the
operating point K !
1
Optimization (tuning the process control station to the controlled system)
and Tv can be set and modified either by means of the adaptation
N
is eliminated.
value in the PARAMETER level until the controlled systems tends to hunt.
value until oscillation cannot be determined any more.
P
= 0. Read off the displayed output variable
d
.
1
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