Cutoff; Sealing Function For The Positioner - Alfa Laval TopControl Basic Manuel D'utilisation

Type 8694
Operation and function

13.1.2. CUTOFF -

sealing function for the positioner
This function causes the valve to be sealed outside the control range.
Control mode resumes at a hysteresis of 1%.
Factory setting: DIP switch 2 set to OFF (no sealing function)
DiP Switches Position
2 ON
OFF
Table 29: DIP switch 2
The communications software can be used to change the limits for the position set-point value as a percentage.
The switching position of the DIP switches in the positioner has priority over the communications
software, i.e. settings of the sealing function (CUTOFF) which are modified via the communications
software are only active if DIP switch 2 in the positioner is set to ON.
Valve stroke [%]
Adjustable from 75 – 100 %
Adjustable from 0 – 25 %
Figure 40: CUTOFF graph
Factory setting can be changed via communications software.
23)
Function
Sealing function active. The valve completely closes below 2 %
and opens above 98 % of the set-point value (CUTOFF)
No sealing function
Set-point
value [%]
23)
English
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