Burkert Type 8630 - Manual (Page 74)

72 - 8630
O
PERATION AND CONTROLLER FUNCTIONS
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 solenoid valves in the TOP Control Continuous and
the pneumatic actuator.
X.CONTRL
Parametrization of the positioner
XXXX
XXXX
Xd1 Xd1 Xd1'
Xd1'
to controller
Dead band Position
actual value
(POS)
Position setpoint
(CMD)
Control
difference
Parameters of the positioner
Gain factor of the positioner (to close the valve)
Gain factor of the positioner (to open the valve)
End of parametrization of positioner. Jump back to X.CONTRL.
NOTE If, during execution of X.TUNE (AUTOTUNE of the positioner), the supplementary function
X.CONTRL is in the main menu, the dead band X.CO DBND is automatically determined in
dependence on the frictional behaviour of the positioning mechanism. The value resulting is
a guide value. It can be readjusted manually.