Flowserve APEX W7000 Pneumatic Positioner - Manual (Page 4)

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Cam Installation:
Introduction: T he standard cam (labeled “K1” features linear, 90 degree operation for full 3-15 psi input, 3-9 and 9-15 psi
split ranges, and 3-15 psi 180 degree operation. The factory setting is 3- 15 psi, 90 degrees, with “D: (direct) side up for full
clockwise position at 3 psi for 90 degree operation.
Caution: Be sure supply air pressure is removed and no pressure exists in the actuator before adjusting cam.
Cam Adjustment/Replacement:
1. Remove cover and indicator.
2. Loosen the cam lock screw (1) and turn the cam locking nut (2) counter-clockwise until the cam is loose. It may
be necessary to brace the output shaft while loosening the cam locking nut.
3. Adjust the cam (3) as desired, making sure that the cam follower (4) always rides on an active lobe on the cam.
4. Secure the cam by finger tightening the cam locking nut (2) and then tighten the cam lock screw (1) see below
Figure below shows cam setting for Direct Action increasing signal 0-100% (20 – 100 kPa, 3-15 psi) to open. Cam
follower to ride on lobe D, 0-100%
Figure below shows cam setting for reverse action, decreasing signal 100 – 0% (100 – 20 kPa, 15-3 psi) to open. Flip
cam over, cam follower to ride on lobe R, 0-100%