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9.
CALIBRATIONS
9.1
L
IMIT SWITCH
9.1.1
The MPV valve is delivered by the factory in closed position. The limit switches
are adjusted to reach the positions of closed valve and completely open valve.
9.1.2
For “OPEN” position adjustment, it is necessary to operate on cam “S2”.
9.1.3
For cam adjustment, use the proper “half-moon” key, supplied with the
actuator and installed inside it.
9.1.4
Use the key from the right side, introducing the pin into one of the holes on
the sides of the blue cam of the cam involved and lever it to required position.
9.1.5
If the blue cam is in a behind position, use at first the lever on its curved side
to move the blue cam to a more suitable position to perform adjustment
[picture 1].
Picture 1
9.1.6
To calibrate, refer to the mechanical position indicator disc; the valve is closed
when the mechanical pointer is in the 0 position, the valve is completely open
when the mechanical pointer is in the 90° position.
9.1.7
The cam adjustment is possible in both directions.
9.1.8
The lever roller operates the microswitch when it is on the bottom of the cam
groove, stopping the motor rotation.
9.1.9
Remove the wrench before starting the actuator.
9.1.10
The movable crown can be driven also by a small screwdriver, acting on the
suitable notches.
9.1.11
Avoid valve rotation over 90°, in order to prevent damage on the adjusting
cylinder, and/or force the potentiometer shaft rotation.
