Burkert 8694 - X.control; Control Parameters of the Positioner; Safpos; Definition Of The Safe Position

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Operation and function
16.2.5 X.CONTROL -
Control parameters of the positioner
Usethisfunctiontosettheparametersforthepositioner(deadbandandamplicationfactors(kp)).
Deadband: Insensitivity range of the positioner
Entry for the deadband as a % in reference to the scaled stroke range;
i.e. stroke limit maximum - stroke limit minimum (see auxiliary function stroke limit (X.LIMIT)).
Thisfunctioncausesthecontrollertorespondonlybeginningataspeciccontroldierence.Thisfunction
saves wear on the solenoid valves in the positioner and the pneumatic actuator.
Iftheauxiliaryfunctioncontrolparameters(X.CONTROL)isinthemainmenuwhileX.TUNE
(Autotuneofthepositioner)isrunning,thedeadbandisdeterminedautomaticallydependingon
thefrictionbehavioroftheactuator.Thevaluedeterminedinthiswayisanapproximatevalue.
Youcanre-adjustitmanually.
Position set-
point value
Control
dierence
Xd1
Position
actual value
to the
controller
Xd1‘
Dead band
Xd1
Xd1‘
Figure 55: X.CONTROL graph
Open/closeamplicationfactor: Parameters for the positioner
Openamplicationfactor:   Amplicationfactorofthepositioner(forclosingthevalve)
Closeamplicationfactor:   Amplicationfactorofthepositioner(foropeningthevalve)
16.2.6 SAFPOS -
Denition of the safe position
Thisfunctionspeciestheactuatorsafetypositionwhichisapproachedatdenedsignals.
Thesetsafetypositionisonlyapproachedifthereisacorrespondingsignalatthedigitalinput
(forcongurationseedigitalinput(BINARY.IN))orifaerroroccurs.
Ifthemechanicalstrokerangeislimitedwiththestrokelimitfunction(X.LIMIT),onlysafetyposi-
tionswithintheselimitscanbeapproached.
ThisfunctionisexecutedinAUTOMATICmodeonly.
english
Type 8694 REV.2