Burkert Type 8791 - Manual (Page 39)

39
ParameterizationofBasicFunctions
7.2.3. CUTOFF -
Sealing function for the positioner
This function causes the valve to be sealed outside the control range.
You can enter the limits for the position set-point value here as a percentage. When these limits are reached, the
actuator will be fully deaerated or aerated respectively.
Control mode resumes at a hysteresis of 1%.
Factory setting: close tight low = 2%;
close tight high = 98%
The switching position of the DIP switches in the positioner takes precedence over the communication
software, i.e. settings of the sealing function (
CUTOFF) that are modified through the communication
software are only active if the corresponding DIP switch in the positioner is set to ON.
98
2 %
% CUTOFF close tight low
close tight high
Fig. 28: CUTOFF function
Valve stroke [%]
Adjustable from 75 – 100%
Set-point value
[%]
Adjustable from 0 – 25%
Fig. 29: CUTOFF graph
English
Software Tool - Positioner