btsr SMART 200 TSS, Operating Manual

Page: 26 / 93

Operation
- 3.10 - SMART 200 TSS
Parameters that affect the sensor detection features
The TS5.. series sensors are microprocessor based electronic sensors capable of
detecting the most common types of yarn tension failures:
!" Positive/negative threshold levels exceeded
!" Positive/negative peak levels exceeded
!" Missing Yarn
The yarn running inside the sensor touches the loading cell that moves horizontally
depending on the tension applied to the yarn itself.
In normal working conditions, the loading cell is pushed inside the sensor by an
amount which is proportional to the yarn tension
(see figure on page 3.7). The
position of loading cell (i.e. the yarn tension) is first converted into an analogue
signal and then into a digital signal by the sensor electronics.
The built-in sensor’s processor performs a real-time processing of such digital
signal through a special program loaded into the sensor memory, which is able to
control the quality level of the yarn running inside the sensor and to detect /
discriminate the presence of the above mentioned failures. The variables of this
program are represented by the settings related to the article which is being
controlled, i.e. the settings that can be
defined , changed and loaded into the
sensors by means of the SMART 200 TSS system:
!" TENS (Nominal Reference Tension)
!" TENS H (Max Tension Threshold)
!" TENS L (Min Tension Threshold)
!" PEAK H (Max Tension Peak)
!" PEAK L (Min Tension Peak)
!" NOYARN (Missing Yarn)
The quality control performed by TS5.. sensors is also affected by other factors
such as:
!" DELAY CONTROL (waiting time before starting the control process)
!"
MONITOR/CONTROL (sensor operating mode)
!" LOCK/UNLOCK (touch light button operating mode)
!"
STOP NO/NC (Stop output operating mode)
!" ENABLE NO/NC (Enable input operating mode)
!" ABS / RELABS (sensor operating mode)
TENS
This parameter indicates the nominal tension value, i.e. the reference (SETPOINT)
tension according to which the threshold and peak minimum and maximum errors
will be calculated.
TENS H
This parameter indicates the Max Threshold Value (expressed as positive
percentage value) with respect to the reference tension TENS, above which a
failure condition will be signaled. The following two values must be specified:
!" ERROR % = Positive error percentage (max threshold) with respect to
the nominal tension TENS
!" TIME = Minimum duration of error condition to signal the failure.