Samson 3274 Mounting And Operating Instructions page 43

Settings for direction of action increasing/increasing (>>) and increasing/decreasing (<>):
1. Disconnect isolating terminal 81:
2. Move the actuator stem to the lower end position.
Actuators with electric override: press button (arrow symbol).
Actuators with mechanical override: use a wrench.
3. Position the segment gear S1 with the corresponding arrow tip depending on the valve
rated travel (15 or 30 mm) pointing towards the axis of the potentiometer P1:
S1
4. Hold the segment gear S1 and turn the axis of potentiometer P1 clockwise using a suit-
able screwdriver as far as it will go.
5. Connect a suitable current or voltage source to the input signal terminals (11 to 13) ac-
cording to the wiring diagram. Connect an ammeter to terminals 31 (+) and 32 (–).
Calibration for direction of action increasing/increasing (>>):
1. Set slider switch SW2 to OFF.
2. Turn 'Zero in' adjuster counterclockwise as far as it will go. Turn the 'Span in' adjuster to
the middle marking:
EB 8340 EN
Red marking pin
Release button
Segment for 15 mm travel
Segment for 30 mm travel
Position of the arrow when the
actuator stem is fully extended
P1 P2
Start-up
7-3