Jordan Valve Mark 17X Series Flameproof Smart Positioner - Manual (Page 11)

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Limit Switch Adjustments
1. HIGH variable resistor adjusts the sensing point of the valve end point. For Direct Acting, it will sense 4mA
point, and for Reverse Acting, 20mA of the input signal will be the sensing point. Red LED will be lit upon
sensing.
2. LOW variable resistor adjusts the sensing point of the valves zero point. For Direct Acting, it will send 20mA
point, and for Reverse Acting, 4mA of the input signal will be the sensing point. Red LED will be lit upon
sensing.
3. If V+ and COM terminals are connected, electric current may be used on limit switch for an alarm or light
indicator as required.
4. If V- and COM terminals are connected, electric voltage may be used on limit switch to receive a signal from
a computer.
5. LS-ACTION, switch to change between Direct (DR), Reverse (REV) action.
6. By adjusting the variable resistor, the limit switch operating range may be set. Turn Clockwise to widen
the range, and Counter Clockwise to shorten the range. As the range adjusts, the red LED will light
to indicate the completion of adjustments.
Variable Orifice Adjustments
Hunting may occur when the actuator volume is too small. In order to prevent hunting, orifice adjustments may be
made. By adjusting the orifice, the flow rate of the supply pressure may be adjusted. Use a flathead screwdriver to
make adjustments as required.
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