West Control Solutions KS 50-1 - Manual (Page 21)

3.5.7 Optimization at the set-point for 3-point stepping controller
As position feedback is not provided, the controller calculates the actuator positi-
on internally by adjusting an integrator with the adjusted actuator travel time.
For this reason, precise entry of the actuator travel time (
tt), as time between
stops is highly important.
Due to position simulation, the controller knows whether an increased or reduced
pulse must be output. After supply voltage switch-on, position simulation is at
50%. When the motor actuator was varied by the adjusted travel time in one go,
internal calculation occurs, i.e. the position corresponds to the simulation:
Simulation real position
Internal calculation tt
Internal calculation always occurs, when the actuator was varied by travel time
tt in one go , independent of manual or automatic mode. When interrupting the
variation, internal calculation is cancelled. Unless internal calculation occurred
already after self-tuning start, it will occur automatically by closing the actuator
once.
Unless the positioning limits were reached within 10 hours, a significant deviati-
on between simulation and actual position may have occurred. In this case, the
controller would realize minor internal calculation, i.e. the actuator would be clo-
sed by 20 %, and re-opened by 20 % subsequently. As a result, the controller
knows that there is a 20% reserve for the attempt.
Operation
KS50/52-1 21 Self-tuning