7
11. SETTING OF THE POTENTIOMETER (optional)
(Figure E)
• Operate valve to the CLOSED position.
Set the potentiometer to the initial position (minimum resistance) by turning spindle (R2).
12. SETTING OF THE CURRENT TRANSMITTER RWG (optional) (Figure E)
Adjustments for 4 mA to close and 20 mA to open
• Run the actuator to the full closed position, and adjust the feedback potentiometer (R2) to the full
clockwise end position. (Note: counter-clockwise for counter-clockwise-to-close actuators).
• Adjust zero adj. potentiometer (L) clockwise until the desired current output for the closed position
is obtained (normally 4 mA). Turn potentiometer clockwise to increase current output, counter-
clockwise to decrease.
• Run actuator to the full open position.
• Adjust max adj. potentiometer (M) until the desired current output for the open position is obtained
(normally 20 mA). Turn potentiometer clockwise to increase current output, counter-clockwise to
decrease.
• Run actuator to the full closed position to check the closed position current output.
• If necessary, readjust the zero adj. potentiometer to the value obtained in Step 3 and repeat Steps
4 through 6. Otherwise, the procedure is complete.
NOTE: The adjustment of the zero adj. and max adj. potentiometers is an interactive process and
may require that the potentiometers are adjusted a number of times.
NOTE: For other settings, please refer to separate setting instructions.
13. MACHINING OF STEM NUT, FORM A OUTPUT DRIVE (Figure C)
Mounting flange does not need to be taken off the actuator.
• Remove the bearing lock nut (80.2) using a wrench or similar tool.
• Take off the stem nut (80.3), thrust bearing (80.01) and thrust bearing races (80.02).
• Remove the thrust bearing and races from stem nut.
• Drill and bore the stem nut, cut the thread.
CAUTION: When fixing in the chuck make sure the stem nut runs true.
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