West Control Solutions Pro-16 - Manual (Page 19)

Operation
9499-040-93811 / 59537-1 Page 19 of 88 Pro-16
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Optimization at the set-point for 3-point stepping controller
As position feedback is not provided, the controller calculates the actuator position
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 deviation 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.