Watson-Marlow SP40 - Manual (Page 51)

MAINTENANCE OF CAM AND ACTUATORS
48
requires some testing with different screw settings.
Based on the difference between the actual response
time of the cam mechanism and the desired response
time, adjust the screw.
The screw of gate 3 will control the time to switch to
pumping condition.
The screw of gate 5 will control the time to switch to CIP
position.
The turning screw (A) allows you to manually operate
the actuator. Turning the screw in position 1 will turn the
cam in one direction. This should be the CIP position.
Setting the screw back to position 0 will move the cam
in the other direction, i.e. to the pumping position.
1. Start with the regulating screws (3) and (5) fully
turned in (ports closed). Then open them
slightly by turning each screw back half a turn.
2. Connect the air supply to the actuator.
3. Switch the valve to manual by turning the screw
(A) into position 1, now the actuator will move
the cam. Determine if the movement is too slow,
too quick or just about right.
4. Switch the turning screw (A) back to position 0,
the cam will move in the opposite direction.
Determine if the movement is too slow, too
quick or just about right.
5. If the cam moves too quick the adjusting screws
(3) and (5) need to be slightly turned in. If the
cam, moves too slow the adjusting screws (3)
and (5) need to be slightly turned out. Screw (3)
regulates the time to switch to pumping
condition. Screw 5 regulates the time to switch
to CIP position.
6. Repeat steps 3-5 until the desired response is
obtained.
7. After the right setting has been found, lock the
screws (3) and (5) with the retaining nuts to fix
their position.
3
A
5