The OSYSU is a 3 position switch. The center position is the normal installation position. Normal is when the switch is installed on the OS&Y valve, the
valve is fully open and the trip rod of the OSYSU is in the groove of the valve stem. Closing the valve causes the trip rod to ride up out of the groove and
activates the switches. Removing the OSYSU from the valve causes the spring to pull the trip rod in the other direction and activates the switches.
Visual Switch Status Indication
There are 3 visual indicators to determine the status of the switches.
Fig 1; the actuator button of the micro switches are on the raised section of the switch actuator.
Fig 2; the trip rod is perpendicular to the base and lined up with the alignment mark on the mounting bracket.
Fig 3; the white visual indicator is visible through the window on the back of the switch actuator.
A final test is to meter the contacts marked COM and N.O. to ensure they are an open circuit when the valve is open and that they close and have continuity
within 2 revolutions of turning the valve handwheel towards the closed position and the contacts remain closed as the valve is completely closed and until
the valve is completely opened when the trip rod drops back into the groove in the valve stem.
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Embedded System
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