btsr SMART MATRIX WARP Operating Manual page 82

Settings that Affect the IS3 Sensor Detection Features
The IS3 series sensors are not simply detecting the presence of the yarn, but they are working as true micro-
computers. They provide a digital signal output, which reflects the condition of the yarn within the detection
area:
Normal yarn running condition
Yarn stopped or broken condition
The functioning of the sensor is based on the principle of variation of the image relative to the shape of the
yarn, detected by the tiny "camera", which is implemented inside the sensor. Such a variation of image
normally occurs only if the yarn is in actual movement inside the detection area, i.e. only if the yarn is
running. Nevertheless, in certain cases, there may be some variation of image even though the yarn is not
running normally, this is the case of a broken yarn oscillating inside the detection area.
Finally there are other factors that can affect the detection activity of the sensors, like the size and type of
yarn (silk, wool, acrylic, Lycra®, single filament nylon), as the variation of the image depends on these
factors as well. That's why the microcomputer embedded in the sensor, processes the images provided by
the "camera" by means of the sensor memory, which takes into account also these other influencing factors.
The variables of this program are represented by the settings connected to the type of yarn used and to the
specific application:
Non-control time (DELAY TIME)
Signaling tolerance for broken yarn (BROKE TIME)
Signaling tolerance for uncut yarn (UNCUT TIME)
Sensitivity (SENS)
Reaction Time (DELAY)
Start Frequency (FSTART)
Stop Frequency (FSTOP)
Non-control time (DELAY TIME)
This parameter allows you to delay the beginning of the actual control process after the activation of SLOW
EXT and FAST EXT inputs. It can be programmed to a value ranging between 0,1 sec. and 25,0 sec.
Signaling tolerance for broken yarn (BROKE TIME)
This parameter allows you to establish the minimum duration of "broken or missing yarn" anomaly, to signal
the (BROKE) condition. Such duration is tightly related to the actual machine operating speed. It can be
programmed to a value ranging between 0,01 sec. and 2,50 sec., or it can be disabled (OFF).
Signaling tolerance for uncut yarn (UNCUT TIME)
This parameter allows you to establish the minimum duration of "uncut yarn" anomaly, to signal the (UNCUT)
condition. Such duration is tightly related to the actual machine operating speed. It can be programmed to a
value ranging between 0,01 sec. and 2,50 sec., or it can be disabled (OFF).
Sensitivity (SENS)
The SENS parameter allows the control of the sensor sensitivity level, depending on the article to be
processed.
It can be programmed with a value between 1 and 10. The default value is 4.
SMART MATRIX
IS3 Sensor Features
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