Burkert Type 8635 - Manual (Page 74)

72 - 8635
O
PERATING AND
C
ONTROLLER
F
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
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
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
KX XXXX
KX XXXX
KX XXXX