btsr SMART WARP, Руководство по эксплуатации

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IS3 Sensor Features
SMART MATRIX - 3-3 -
The suggested values for different yarns are as hereafter indicated:
Very thick yarns
1
Thick yarns
3
Medium yarns
5
Fine yarns (single filament yarn)
6 - 8
Very fine yarns (Lycra®)
9 - 10
Reaction time (DELAY)
The DELAY parameter allows the adjustment of the sensor to the characteristics of the yarn to be worked
(e.g. elasticity) , by defining the Reaction Time of the sensor before signaling a defect. It is possible to
program 8 pre-set values:
5 ms - 10 ms - 20 ms - 50 ms - 100 ms - 200 ms - 500 ms - 1000 ms
¾ 50 ms is the suggested value for very high running speed of the yarn.
¾ 200 ms is the suggested value for normal yarns.
¾ 500 ms is the suggested value for elastic yarns.
Start Frequency (FSTART)
This setting indicates the minimum frequency of image variation, beyond which the sensor signals that the
yarn runs normally
(green LED ON). It can be programmed to a value between 1 and 10 .
Stop Frequency (FSTOP)
This setting indicates the minimum frequency of image variation, below which the sensor signals that the
yarn runs normally
(red LED ON).
It can be programmed to a value between 1 and 10 .
Programming examples for FSTART/FSTOP and relevant sensor delays
As the diagram shows, if the FSTART and FSTOP value is set low (e.g. = 2) , the sensor could detect the
condition of “running yarn” even though the yarn is actually still or broken, and is undergoing a light
oscillation
( A and B areas of the diagram) . Otherwise, if a higher value is set (e.g. = 5) the image variation of
A and B areas is not considered sufficient to detect the condition of “running yarn”.
It must be observed, however, that if the yarn detected by the sensor has a very regular profile (e.g. Lycra®
or single filament yarn) , the frequency of the image variation is lower; therefore if a value too high is
programmed, the sensor could not detect the “running yarn” condition (or it would detect it with excessive
delay) . This is why the FSTART and FSTOP values can be “calibrated” according to the article to be
processed, in order to obtain the condition of optimal detection for that particular article.
Note: In the presence of frequent errors detected by the sensors, it is suggested to gradually change such
values until an optimal condition is achieved.