Burkert Type 8630 - Manual (Page 68)

66 - 8630
O
PERATION AND CONTROLLER FUNCTIONS
Setting range: 75 ... 100 %
Setting range: 0 ... 25 %
Valve stroke [%]
(POS)
Setpoint [%]
(CMD)
CUTOFF
Tight closure function for positioners or process controllers
Factory setting: CUT = 0 %; CUT = 100 %
This function causes the valve to close tightly outside the control range. Enter here the limits in percent
for the position setpoint (CMD) or, with activated PID controller either for the position setpoint or for the
process setpoint SP, from which the actuator is to be completely vented or pressurized. In the case of
the fast pressurization/venting version, two valves are driven in each case in order to obtain complete
venting more rapidly. Opening or resumption of controlled operation is performed with a hysteresis of 1
%.
If the process valve is in the region of tight closure, there appears in the display a flashing MIN or MAX
symbol.
Tight-closing threshold exhaust (0 = inactive); setting
range: 0..25 %.
Tight-closing threshold pressurize (100 = inactive);
setting range: 75 ... 100 %
Limits refer to process setpoint (SP)
Limits refer to position setpoint (CMD)
Menu appears only with
activated PID controller