Single Adaptation (Adaptation During The Start-Up Phase) - Samson Trovis 6400 Mounting And Operating Instructions

AdP level (adaptation of the control parameters)

6.13.1. Single adaptation (adaptation during the start-up phase)

Use C 51-2 to select single adaptation. Also use C52-2 with cascade control.
The following adaptation parameters must be set before starting the adaptation algorithm:
GW X Min. limit for the controlled variable test range in %
GW X Max. limit for the controlled variable test range in %
GW Y Min. limit for the output variable test range in %
1
GW Y Max. limit for the output variable test range in %
1
T K Pulse duration of the output test signal in s (for positive values) and min (for
S 3
negative values)
K Factor for set point (reference variable) filter
5
The adaptation algorithm runs through the steps noise band measurement (nb) and identifica-
tion (idF).
In the noise measurement procedure, the noise band of the controlled variable is determined in
several tests. The sequence of operations can be followed on the display of the process control
station where changing status displays appear (see Fig. 34 ).
For the identification procedure, the operator has to excite the controlled system with a control
pulse (T K ) whose time and amplitude is limited. Then, the process control station waits for any
S 3
change in behaviour of the controlled system and permanently monitors the response of the
controlled variable. If the controlled variable is stationary while the pulse is still active, the
adaptation algorithm determines the type of control process, the process gain, and the dynamic
behaviour of the controlled process, and calculates the control parameters for, e.g. an
increasing output signal.
The controlled variable is considered to be stationary when it does not exceed or fall below a
factory-adjusted deviation for a certain period of time.
The control pulse is switched off when the control parameters for the increasing output signal
have been calculated. The control station monitors the behaviour of the controlled system again.
When the controlled variable is stationary, the control station calculates the parameters for a
decreasing output signal.
Should the controlled variable not become stationary, the process control station will provide
an error message (see p. 90).
If the controlled variable threatens to leave the test range (adjusted by the operator) after
exciting the controlled system, the control pulse is inactivated. A new amplitude-corrected pulse
value is calculated from the characteristic of the controlled variable until the time when the pulse
is switched off, and the procedure described above is repeated.
The pulse is also switched off when it exceeds the pulse time. Then, the same takes place as
described above.
In the identification procedure, the adaptation steps are indicated on the display of the process
control station in the sequence illustrated in Fig. 35. Individual steps are omitted, depending on
which type of controlled system was determined.
The adaptation procedure can run automatically. Then, the adaptation step −Aut AdP− has to
be accessed in the ADAPTATION level (see p. 46). At the end of the adaptation cycle, End Aut
comes up on the display. The operator can carry out each adaptation step individually. In this
case, first access adaptation step −nb AdP− , then −IbF AdP− (see p 46).
48
Operation