1 5
INSTALLATION
POSIMATIC
22: MAX POSITION
End of manipulated variable limiting (YE)
This function corresponds to a mechanical limitation of the lifting movement.
Parameters 21 and 22 limit the mechanical travel (from stop to stop) to the preset values. The
mechanical range of the actuator on the effective flow can thus be limited.
Fig. 6: Limitation of lifting and closing movement
i
24: SETP DIRECTN
Setpoint direction
Setting the setpoint direction specifies direction of action of the setpoint. It is mainly required for the split range mode and
for single acting actuators with „OPEN“ safety position („control function 2“).
23: CLOSE TIGHT
Tight closing of manipulated variable
This function enables driving the valve at maximum actuator speed into its seat. The tight closing function can be activated
for one or both stop positions. CLOSE TIGHT is effective as soon as the setpoint is 0.5% above
MIN POSITION
or 0.5%
below
MAX POSITION
.
Since the setpoint range is set between 0% and 100% by 21 and 22, the threshold of activation of the tight closing
function in relation to the flow can be additionally adjusted downward with 21 and upward with 22.
Fig. 7: Tightly closing function
Fig. 8: Setpoint direction
Physical stroke x (%)
Position
Limited stroke x (%)
Flow
Unlimited stroke
Limited stroke
Setpoint w (%)
Setpoint w (%)
Stroke x (%)
Physical stroke x (%)
Setpoint w (%)
