Adjusting The Resistance Transmitter - Samson 3274 Mounting And Operating Instructions

Start-up

7.5 Adjusting the resistance transmitter

The actuator can be equipped with two resistance transmitters at the maximum. Potentiometer
P1 is required for internal position feedback in actuators with positioner or position transmit-
ter. Therefore, external position feedback cannot be used in this case.
Potentiometer P1:
1. Move the actuator stem to the lower end position.
2. Position the segment gear S1 with the corresponding arrow tip depending on the valve
rated travel (15 mm or 30 mm) pointing towards the axis of the potentiometer P1.
S1
3. Hold the segment gear S1 and turn the axis of potentiometer P1 clockwise using a suit-
able screwdriver as far as it will go.
Potentiometer P2:
Potentiometer P2 is driven by the pinion of potentiometer P1. Opposed resistance values
arise as a result.
Î Set as described for P1.
Î Turn potentiometer P2 counterclockwise as far as it will go.
7-8
Segment for 15 mm travel
Segment for 30 mm travel
Position of the arrow when the
actuator stem is fully extended
P1 P2
EB 8340 EN