Filtec FT-70c, Service And Technical Reference Manual

Page: 159 / 243

FT-70 Fill Level Inspector Service Manual
6-20
Executing the Encoder Calibration Routine
Use the largest possible opaque container when executing the
Calibrate Encoder Routine. The larger and more opaque the
container, the greater the accuracy of the sensor readings. For
example, if the test container diameter is 28 mm, the calculation
error factor is
±
2 teeth. If the test container diameter is 66 mm, the
calculation error factor is
±
1 tooth.
Note
Slipping a short piece of pipe over the container neck is a useful
way to increase the width of the can at the trigger point. If you
choose to do this, you must repeat step 9 in order to enter the pipe
diameter.
19. Open dip switch S1-6.
20. Start the conveyor and run it at the highest available speed.
You may not be able to achieve the highest expected
production speed unless the filler unit is running.
21. Press Key 5 until CALIBRATE ENCODER appears and press
the Arrow Key to execute the encoder calibration routine. This
procedure takes several seconds to complete. When READY is
displayed, proceed to the following step.
22. Place the container on the conveyor upstream of the FT-70 so
the container passes through the inspection tunnel without
slipping. The FT-70 automatically calculates the prescaler
value. It takes several seconds for the FT-70 to make this calcu-
lation. When RUN 16 CONTAINERS appears, proceed to the
following step.
23. Run the container 16 times (it is not necessary for the
containers to pass the rejector), through the FT-70 inspection
tunnel without slippage. When finished, the FT-70 automati-
cally completes the encoder calibration calculations, including
the Calibrate Encoder Value, Encoder Prescaler Value, Gamma
Sample Cutoff Limit, and Conveyor Drive Sprocket Teeth.
24. Close dip switch S1-6 and then stop the conveyor.
25. If you used a container other than a production container for
the calibration (or used the pipe method), press Key 5 until
CAN WIDTH AT TRIG appears and enter (in millimeters) the
production container’s width at the trigger point (see steps 14
and 15).
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