Loma IQ3X Operating Instructions Manual page 62

Operating Instructions
Note that this option will only appear if the Auto-Frequency option is selected and
the Dry Working Mode option is not selected in the Menus > Learn > Set Up menu.
Flow Length
The Flow length option is displayed if a Product Registration Photo-eye is in use and the PEC
enable option has been selected in the Menus > Service > Configuration > System menu. The
detector needs to know the length of the pack to enable it to function correctly.
Measure the product diagonally and enter that length to provide some tolerance and avoid the
generation of false triggers and nuisance error messages; for example where the external
packaging has curled up or packs are presented too close together. Then enter the pack length
in millimetres.
Reject Delay
The following should be noted before setting up the Reject Delay and Reject Dwell timing for a
product.
Setting reject times is best done by passing the product, contaminated by a detectable metal
test sample, through the machine and the adjusting the delay (time or distance from detect to
reject) and dwell (time or distance the reject device operates for) to obtain a clean removal of
the contaminated product from the transport into the reject collection device. All units of time
are in seconds.
For systems where a Product Registration Photo-eye is not being used, the reject delay time is the
time in seconds between when a contaminant is detected in a product to when the reject
device is activated to remove it from the production line.
The position of the contaminant within the product (length) will directly affect the reject delay.
You must therefore make allowances in the delay time to ensure that wherever the
contaminant is located in the product a clean rejection is achieved.
For systems where a Product Registration Photo-eye is used, reject delay timing is always timed
from when the leading edge of the product activates the photo-eye regardless of where in the
product the metal contamination is situated.
When using variable speed systems, the delay is timed by distance which is entered in metres in
the Reject delay field. See the Menus > Service > Configuration > System menu to view the
available speed mode options.
Enter the reject delay time in seconds, or for variable speed systems, enter the distance in
metres.
Reject Dwell
Reject dwell is the time or distance that the reject device operates for to remove a
contaminated product from the conveyor belt and into the reject collection device. It must
therefore be set to ensure clean removal of the contaminated product.
Please read through the information contained in the Reject delay section above for further
guidance. Reject timings may also be set in the Menus > Service > Reject > Set Up menu.
Enter the reject dwell time in seconds, or for variable speed systems, enter the distance in
metres.
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