Instruction Manual
D103785X012
Wiring Practices
June 2017
15
Using a Potentiometer with Two Fixed Resistors as a Remote Travel Sensor
Perform the following procedure if a potentiometer is used with the same, or slightly longer travel than the actuator's
travel.
Note
The potentiometer must be capable of resistance close to 0 Ohms.
CAUTION
To prevent damage to the potentiometer, ensure that it is free to travel the entire length of the actuator's travel.
Note
The digital valve controller must be configured using the SStem/Roller selection on the menu of the appropriate setup device.
This procedure uses three resistors connected in series, two fixed resistors and one potentiometer. Three conditions
must be met for the resistor combination to correctly operate the digital valve controller:
D The maximum resistance of the potentiometer [Rpot(max)] must be between 3.9 kOhm and 10 kOhm.
D The resistance of R
1
is 4.25 times greater than Rpot(max).
D The resistance of R
2
is 4 times less than Rpot(max).
WARNING
To avoid personal injury or property damage from an uncontrolled process ensure that the R1 resistor is properly insulated
before installing it in the terminal box.
1. On the base unit, remove the feedback connections terminal box cap.
2. If necessary, install conduit between the two‐resistor series and the base unit following applicable local and national
electrical codes. Route the 3‐conductor shielded cable between the two units (refer to figure 2‐5).
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