West Control Solutions KS 92-1 Programmer manual - Manual (Page 19)

3.5.7 Optimization at the set-point for 3-point stepping controller
With 3-point stepping controllers, the pulse attempt can be made with or without
position feedback. Unless feedback is provided, the controller calculates the mo-
tor actuator position internally by varying 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 volt-
age 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 actual 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 devia-
tion between simulation and actual position may have occurred. In this case, the
controller would realize minor internal calculation, i.e. the actuator would be
closed by 20 %, and re-opened by 20 % subsequently. As a result, the controller
knows that there is a 20% reserve for the attempt.
Operation
KS 90-1
p / KS 92-1 p 19 Self-tuning