How-To: Calibrate a 3730-3 HART Positioner
Step by Step Instructions:
- Configuration mode must be entered before any changes can be made. Using the rotary push button, turn it until parameter 3 is shown, and push the button. Turn again until the display shows "Yes", and push to accept the change.
- Now go to parameter 36 to reset the positioner to factory defaults. Push the knob and then rotate until it indicates "Standard" and push once again. Wait until "Standard" disappers from the display to complete the factory reset.
- We can now begin to calibrate the positioner. To ensure changes can be made, we'll confirm configuration mode is still enabled by going back to parameter 3 and ensure "Yes" is still displayed.
- Parameter 4 indicates the pin position and is changed to 35.
- Parameter 5 sets our travel, and is kept at 15 mm.
- Parameter 6 is changed to nominal to use our 15mm stroke rather than the valve maximum.
- The final parameter to set is 7, this is our operating direction and is set to increasing-increasing.
- Now, go back to parameter zero and press the recessed initialization button to begin the auto calibration process.
- This process can take a few minutes while the positioner adapts itself to this specific valve and it's operating characteristics. It is important not to disturb or interrupt this process until it's finished.
- Once the calibration is completed, the display will briefly show "Tuned", and then revert to the position specified by the control signal.
- To confirm correct operation, cycle through various set-points and ensure the valve responds accurately.
- The positioner is now calibrated.