Instruction Manual
D103176X012
Detailed Setup and Calibration
June 2017
29
Adjusting the output bias aligns the travel set point with the actual travel by computing the drive signal required to
produce 0% error. This is done while the valve is at 50% travel, making very small adjustments.
2. Place the instrument In Service and verify that the travel properly tracks the current source.
Manual Calibrate Travel
Two procedures are available to manually calibrate travel:
D Analog Adjust
D Digital Adjust
Analog Calibration Adjust
Connect a variable current source to the instrument LOOP + and LOOP - terminals. The current source should be
capable of generating 4 to 20 mA. Follow the prompts on the Field Communicator display to calibrate the instrument's
travel in percent.
Note
0% Travel = Valve Closed
100% Travel = Valve Open
1. Adjust the input current until the valve is near mid-travel. Press OK.
Note
In steps 2 through 4, the accuracy of the current source adjustment affects the position accuracy.
2. Adjust the current source until the valve is at 0% travel, then press OK.
3. Adjust the current source until the valve is at 100% travel, then press OK.
4. Adjust the current source until the valve is at 50% travel, then press OK.
5. Place the instrument In Service and verify that the travel properly tracks the current source.
Digital Calibration Adjust
Connect a variable current source to the instrument LOOP + and LOOP - terminals. The current source should be set
between 4 and 20 mA. Follow the prompts on the Field Communicator display to calibrate the instrument's travel in
percent.
Note
0% Travel = Valve Closed
100% Travel = Valve Open
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