Watson-Marlow SP40 - Manual (Page 40)

MAINTENANCE OF CAM AND ACTUATORS
37
8.3 Positioning of the electrical actuator
The rotation angle of the electrical actuator is limited by
two mechanical stops to an angle of 90-100°. The
maximum allowable rotation angle is set by the cam
assembly and is 116°. The actuator rotation angle range
must be aligned to the cam assembly in such a way that
at minimum and maximum rotation angle there still is
clearance between the guiding pin on the cam and the
sliding groove in the bracket.The middle position of the
actuator can be determined as follows.
1.
Take a corner of the actuator output shaft as
reference. Mark this corner (A). Use a marker.
2. Turn the wheel on the actuator fully towards the
CW direction until it is blocked.
3. Set a mark (B) at the actuator flange at the
same angular position as the reference point.
4. Turn the wheel on the actuator fully towards the
CCW direction until it is blocked.
5. Set a mark (C) at the actuator flange at the
same angular position as the reference point.
A
B
CW
CCW
C
B