Samson 3730 Series Mounting And Operating Instructions page 10

Design and principle of operation
Positioner with position transmitter
The position transmitter (13) is a two-wire
transmitter and issues the travel sensor sig-
nal as a 4 to 20 mA signal processed by the
microcontroller.
Since this signal is issued independent of the
positioner's input signal (min. current
3.8 mA), the actual travel/angle of rotation
is controlled in real-time. Additionally, the
position transmitter provides the possibility
of signaling a positioner fault over a signal
current of <2.4 mA or >21.6 mA.
Version with inductive limit switch
The rotary shaft of the positioner carries an
adjustable tag which actuates the installed
proximity switch.
The optional inductive limit switch (11) leads
to A1 and the software limit switch, which
keeps its function, leads to A2.
Version with external position sensor
In this version, only the sensor is mounted to
the control valve. The positioner is located
separately from the valve.
The connection of x and y signals to the
valve is established via cable and piping for
air (only without inductive limit switch).
10
EB 8384-3 EN