Filtec FT-70c, Service And Technical Reference Manual

Page: 160 / 243

Chapter 6: Calibration Procedures
6-21
Fine-Tuning the Rejector Timing
To fine-tune the calibration accuracy you may need to adjust the
number of sprocket teeth estimated during the Calibrate Encoder
Routine. Experiment with a production container and observe the
rejector timing. Based on where the rejector pad contacts the
container, you must increase or decrease the number of teeth until
the can contacts the pad correctly.
26. To verify the calibration press Key 4 until REJECT NEXT
appears and then press the Arrow Key to enter the number of
containers you want to reject consecutively. Choose a number
such as 6 or higher to provide enough attempts to make adjust-
ments. When the number reaches zero, you must repeat this
step to reactivate the rejector.
27. With the conveyor running very slowly so the reaction delay
does not effect the result, place a production container
upstream of the FT-70 so that it passes through the FT-70
without slipping. If the container appears to make contact on
upstream third of the rejector, proceed to step 29.
Note:
The slat rejectors have a variation factor of
±
0.5 inch. If you are
using a slat rejector, average the accuracy over several rejects using
a single slat.
28. If the container is not rejected properly, make changes to the
measured distance or number of sprocket teeth as follows:
• Verify the Inspect Trigger to C/L Rejector distance is
measured and entered correctly (see steps 8 and 9).
• Verify the number of conveyor drive sprocket teeth is
entered correctly (see step 10).
The container position at reject can be in error by 0.5 inch for
every 12 inches of distance from the inspection trigger to the
rejector centerline (or slat assembly). For example:
• If the Inspection Trigger to Centerline Rejector distance is
24 inches and the container is 1 inch upstream of the
rejector when it fires, then the number of drive sprocket
teeth should be reduced by one.
• If the container is 1 inch down stream when the rejector
fires, the number of teeth should be increased by one.
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