Burkert Type 8635 User Manual

Page 74

72 - 8635

PERATING AND

ONTROLLER

UNCTIONS

Insensitivity range (dead band) of the positioner

Entry of the dead band in %, referred to the scaled stroke range; i.e.

LIM minus LIM (see

function

X.LIMIT). This function assures that the positioner cuts in only above a certain control

difference. The function reduces wear on the piezoelectric valves in the SIDE Control and the
pneumatic actuator.

X.CONTRL

Parametrization of the positioner

Parameters of the positioner

Amplification factor of positioner (to close the valve)

Amplification factor of positioner (to open the valve)

End of parametrization of positioner. Jump back to X.CONTRL

XXXX

NOTE

If the supplementary function

X.CONTRL is present in the main menu during execution of

X.TUNE (AUTOTUNE of the positioner), automatic determination of the positioner dead
band

X.CO.DBND occurs additionally as a function of the frictional behaviour of the

actuator. The value determined in this way is a standard value and can be reajusted
manually.

Xd1

Xd1'

to controller

Dead
band

Position
actual value
(POS)

Position
setpoint
(CMD)

Control
difference

X.CONTRL

X.CO DBND

DBND XX.X

X.CO PARA

X.CO END

KX XXXX