Calibration
September 2013
5-5
6. Adjust the current source until the valve is at 0%
travel, then press OK.
7. Adjust the current source until the valve is at 100%
travel, then press OK.
8. Adjust the current source until the valve is near 5%
travel, then press OK.
9. Adjust the current source until the valve is near
95% travel, then press OK.
10. Place the instrument In Service and verify that the
travel properly tracks the current source.
Digital Calibration Adjust
Select Calibrate, Travel Calibration, Manual
Calibration and Digital 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
1. Adjust the input current until the valve is near
mid-travel. Press OK.
2. From the adjustment menu, select the direction and
size of change required to adjust the output until the
valve is near mid-travel. Selecting large, medium, and
small adjustments causes changes of approximately
10.0
°
, 1.0
°
, and 0.1
°
, respectively, to the feedback
arm rotation.
If another adjustment is required, repeat step 2.
Otherwise, select Done and go to step 3.
3. If the feedback connection is Rotary - All, SStem -
Roller, go to step 8. If the feedback connection is
SStem - Standard, adjust the feedback arm to the
crossover point by using the adjustment menu.
4. From the adjustment menu, select the direction and
size of change required to set the feedback arm so it
is 90
°
to the actuator stem, as shown in figure 5-1.
Selecting large, medium, and small adjustments to the
crossover causes changes of approximately 10.0
°
,
1.0
°
, and 0.1
°
, respectively, to the feedback arm
rotation.
If another adjustment is required, repeat step 4.
Otherwise, select Done and go to step 5.
5. From the adjustment menu, select the direction and
size of change required to set the travel at 0%.
Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation.
If another adjustment is required, repeat step 5.
Otherwise, select Done and go to step 6.
6. From the adjustment menu, select the direction and
size of change required to set the travel to 100%.
Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation.
If another adjustment is required, repeat step 6.
Otherwise, select Done and go to step 7.
7. From the adjustment menu, select the direction and
size of change required to set the travel to 50%.
Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation.
If another adjustment is required, repeat step 7.
Otherwise, select Done and go to step 8.
8. From the adjustment menu, select the direction and
size of change required to set the travel to 0%.
Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation for a
sliding-stem valve or to the travel for a rotary valve.
If another adjustment is required, repeat step 8.
Otherwise, select Done and go to step 9.
9. From the adjustment menu, select the direction and
size of change required to set the travel to 100%.
Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation for a
sliding-stem valve or to the travel for a rotary valve.
If another adjustment is required, repeat step 9.
Otherwise, select Done and go to step 10.
10. From the adjustment menu, select the direction
and size of change required to set the travel to near
5%. Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation for a
sliding-stem valve or to the travel for a rotary valve.
If another adjustment is required, repeat step 10.
Otherwise, select Done and go to step 11.
11. From the adjustment menu, select the direction
and size of change required to set the travel to near
95%. Selecting large, medium, and small adjustments
causes changes of approximately 10.0
°
, 1.0
°
, and
0.1
°
, respectively, to the feedback arm rotation for a
sliding-stem valve or to the travel for a rotary valve.
If another adjustment is required, repeat step 11.
Otherwise, select Done and go to step 12.
5
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