Optical Sensor
The optical sensor is mounted to the top plate. The camshaft
cup rotates through the sensor and the slots are detected. A
signal is sent to the controller for each slot.
NOTE:
Damaged sensors should be replaced. Sensors may
be cleaned with compressed air or a soft brush.
Do not bend the legs on
the optical sensor.
To remove optical sensor:
1. Disconnect power to the unit.
2. Remove cover.
3. Remove controller.
4. From the controller side, pinch the legs of the sensor
holder in the top plate.
5. Pull the holder away from the mounting surface.
6. Remove wires.
To install optical sensor:
1. Attach wires. Wires should point away from camshaft.
2. Place leading edge of sensor holder into opening.
3. Pivot holder into place. Legs should enter slots and snap
in place.
WARNING:
The optical sensor legs are fragile and may
break. If the optical sensor legs break or crack,
we recommend replacement. A damaged
sensor may result in improper regeneration.
Camshaft
The camshaft has several lobes that push open the valve discs
as the camshaft rotates. Rotation is controlled by a drive motor
that drives a gear at the rear of the camshaft. The front end
has a cup with markings and slots.
WARNING:
The camshaft slots are molded to exact
dimensions. Do not attempt to modify the cam
cup slots. Improper regeneration will occur!
Lobes
Slots
Cup
The outside surface of the cup has an arrow mark. When the
arrow is at top center, the camshaft is in the loading position.
90 degrees clockwise on the cup an optical sensor is mounted
to the top plate. This sensor reads the slots as they pass
through. The largest slot is “Home” and the remaining slots
are positioned to signal the regeneration cycles.
When looking at the end of the camshaft, numbers are visible
in the hollow of the cup. An arrow on the top plate points to the
current marking. The numbers represent regeneration cycles
as follows:
C0 =Treated water-normal operation mode
C1 = Backwash
C2 = Regenerant draw (not used in filter mode)
C3 = Slow rinse (not used in filter mode)
C4 = System pause
C5 = Fast rinse cycle 1
C8 = Regenerant refill (not used in filter mode)
These numbers are offset rotationally 90 degrees from the
matching slot. The offset enables the service person to view
the number at the top of the cup and determine which slot is at
the optical sensor.
NOTE:
If any part of the camshaft is broken or damaged the
camshaft should be replaced. Do not repair or modify
damaged cam lobes, gears or timing cup.
To remove camshaft:
1. Disconnect power to the unit.
2. Remove cover.
3. Remove motor.
4. Camshaft should be in the treated water position. Rotate
counterclockwise as needed.
5. Use a screwdriver to hold open the #1 valve disc.
NOTE:
When replacing/removing camshaft, make sure not
to damage or mis-align the optical sensor. Hold the
sensor in position while removing camshaft.
6. Move the camshaft backwards, away from the controller.
7. Lift the loose front end up and out.
To install camshaft:
1. Check that the optical sensor is in position.
2. Position camshaft above the valve discs. The arrow on the
cup should be up.
3. Slide the rear of the camshaft into place.
4. Pivot the camshaft close to its final position.
5. The camshaft will push on one or more valve discs. You will
feel resistance as you complete the installation.
6. Move the camshaft down and into position. Force valve
discs to move as needed.
7. Move the camshaft forward. Check that the optical sensor
is in position.
8. Install motor.
NOTE:
The camshaft will position itself to C0 (treated water)
when the controller is powered up.
SERVICE AND MAINTENANCE
CONTINUED
24
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AUTOTROL
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Logix 764 Control Performa Cv Series Valves (273, 278) Service Manual
