ABB AV1 Operating Instructions Manual page 119

TYPE AV1 PNEUMATIC POSITION TRANSMITTER
CALIBRATION
Make sure the position transmitter is at maximum gain (Table 4-1)
prior to making any adjustments. The positioner comes with the
maximum gain hinge spring installed from the factory.
The following description is based on a 20.7 to 103.4-kilopascal
(3.0 to 15.0-pound per square inch gage) output for zero to
100-percent travel of the actuator.
1. Install an accurate pressure gage at the output connection (02
port).
2. Turn off the supply air.
3. Slowly stroke the actuator to its zero position.
4. Adjust the linkage between the transmitter and the actuator
until the cam follower is aligned with the zero line on the cam (Fig.
3-8).
5. Slowly stroke the actuator to the 100% position.
6. Adjust the pivot position on the arm (Item 63, Fig. 9-3) or other
external linkage until the cam follower is at 100% of cam rotation
(radial line marked 100 on the cam).
7. Repeat Steps 3 through 6 until the cam follower is at 0% cam
when the actuator is at 0% stroke and 100% cam when the actua-
tor is at 100% stroke.
8. Turn on the air supply.
9. Move the actuator to the 0% stroke position.
10. If the output is not 20.7 kPa (3.0 psig), loosen the zero adjust-
ment set screw on the zero adjustment nut (Fig. 4-1). Turn the
zero adjustment nut (while keeping the eyebolt from rotating) until
a 20.7-kPa (3.0-psig) output is achieved.
11. Tighten the zero adjustment set screw.
12. Move the actuator to the 100% stroke position.
13. If the output is not at 103.4 kPa (15.0 psig), loosen the span
adjustment screw and move the span adjustment assembly (Fig.
4-1) along the cam follower arm until a 103.4-kPa (15.0-psig)
reading is obtained.
14. Tighten the span adjustment screw.
CALIBRATION
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