Samson 3374-11 - 9.3 Operating direction

52 EB 8331-4 EN
Congurationlevel
− Internalpositioningvalue(c32=INT): The actuator stem moves to the position specied
in Code c33 upon failure of the input signal.
− Lastposition(c32=LAST): The actuator stem remains in the last position that the valve
moved to before failure of the input signal.
The error message is reset and the actuator returns to closed-loop operation if the input sig-
nal moves within 0.2V or 0.4mA of the lower range value.
Code Description WE Adjustment range
c31 Detect input signal failure NO NO (function inactive)
YES (function active)
c32 Positioning value upon input signal fail-
ure
INT INT (internal positioning value)
LAST (last position)
c33 Internal positioning value 0.0 % 0.0 to 100.0%
9.3 Operating direction
Î See Fig.21 on page53.
− Increasing/increasing(c42=>>):
The actuator stem retracts as the input signal increases.
− Increasing/decreasing(c42=<>):
The actuator stem extends as the input signal increases.
Actuator stem extended
− With globe valves: Valve closed
− With three-way mixing valves: Port A à AB open, B à AB closed
− With three-way diverting valves: Port AB à A closed, AB à B open
Actuator stem retracted
− With globe valves: Valve open
− With three-way mixing valves: Port A à AB closed, B à AB open
− With three-way diverting valves: Port AB à A open, AB à B closed