West Control Solutions KS98-1 - Manual (Page 42)

The internal can be altered at any time,
also when another is active.
source
source switchover is possible via a selection field on the
controller page.
Dependent on controller configuration, selection of Wint,
Wext and W2 is possible.
The field can be left with Quit, if no switchover is needed,
Self tuning
Determination of the optimum process parameters is possible by self-tuning. Self-tuning is available for processes
with compensation and no delay time.
Dependent on controller type, parameters Xp1, Xp2, T
n
, Tv, Tp1, Tp2 are determined.
Preparation
w Adjust the desired controller behaviour.
w e = 0.0.
w P- controller: Tn = 0.0 Tv = 0.0
PD- controller: Tn = 0.0 Tv > 0.0
PI- controller: Tn > 0.0 Tv = 0.0
PID- controller: Tn > 0.0 Tv > 0.0
w If a controller has several parameter sets, selection of the parameter sets to be optimized is required
((
POpt=1...6). If necessary, these settings must be made available when creating the engineering ).
w Switch the controller to manual mode (key H). Alter the correcting variable to reach the working point.
The process must be in a stable condition. Self-tuning starts only, when process value oscillations are smaller than
0.5% of the control range during one minute (controller display:‚ process at rest ’ (PiR)).
+ If necessary, other control loops in the plant must be set to manual mode as well.
Operating pages 9499-040-82711
I-42 Controller
W
Temperature
Fig.25 : adjustment via the front panel
W
source
Temperature
Fig. 26 Front-panel switchover
Fig. 27 Calling up the self-tuning page