Drive Arm Connections - ABB AV3 Instruction Manual

Before mounting or installing positioner, check nameplate
data to make certain positioner is suitable for application
WARNING
desired. DO NOT AT ANY TIME EXCEED THE RATINGS
LISTED ON THE NAMEPLATE.
length of the actuator. Refer to Figure
each drive arm hole.
2. Install the cam (black, direct-acting; or red, reverse-acting)
that will provide the required direction of rotation.
A forward-acting (black) positioning cam with segments A, B and
C (Fig. 3-5) and a reverse-acting cam (stored on the inside of the
positioner cover has red radial lines and arcs) are furnished with
each positioner. Cam A is for a square root function, cam B is for
linear motion and cam C is a square function (Table 3-1). The B
cam is in place when the positioner is shipped from the factory.
The cams may be shaped to conform to special applications.
Refer to
NOTE: If application is reverse-acting, the reverse-acting cam
(red radial lines) must be installed and ports 01 and 02 connec-
tions must be reversed.
7X
STROKE
(45° OR HALF CAM)
2.00
50.8
1.75
44.5
1.50
38.1
1.25
31.8
1.00
0.33 TYP
25.4
8.4
0.75
19.1
0.50
12.7
0.65
16.5
DIMENSIONS
INCHES
MILLIMETERS
TYPE AV
Figure 3-4. Drive Arm Connections
Appendix C for information about cam shaping.
MOUNTING TYPE AV3 AND AV4 POSITIONERS
INSTALLATION
3-4 for the stroke length for
0.193-200
4.9-5.1
STROKE
(90° OR FULL CAM)
4.00
101.6
3.50
88.9
3.00
76.2
2.50
63.5
2.00
0.35
50.8
8.9
1.50
38.1
1.00
25.4
0.71
18.0
0
TYP
T00804A
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