UVX-300P Operating Instructions
6
Document no. 10011004
Null Offset (nu)
NOTE: Always perform the null function when installing or removing optional lens or changing LED
intensities.
The null feature allows the sensor to be “zeroed”. For example, when the target is not in view and
there is a background that causes a reading above zero, the null feature allows this level to be
subtracted out, allowing the display to indicate 00. Press and hold the T/+ key to null the sensor.
The display will flash the value that is being subtracted. To set the sensor back to a true zero, aim
the sensor away from any target and repeat the null process.
Teach Function
The teach function allows the user to set the threshold by placing a representative target located at
the required distance and allowing the sensor to determine the optimum LED intensity and setting of
the threshold level.
1.
Press and hold the T/+ key for several seconds until the yellow led flashes.
2.
Place the target at the appropriate distance from the sensor and press the P/- key. The
display will flash 3 times and the sensor will adjust the LED intensity level to achieve
reasonable signal level. The green LED will flash.
3.
Remove the target and press the P/- key. The display will flash 3 times.
4.
Exit the teach function and return to the normal operating mode by Pressing the T/+ key for
several seconds.
When in the teach mode the LED flashes constantly, yellow, green or red. Yellow indicates that the
sensor is ready to be taught the Detect level. Green indicates that the sensor is ready to be taught
the Undetect level. Red indicates that the last attempt to teach resulted in an error. If the error
occurred during the teaching of the Detect level then the signal intensity was less than 01. If the
error occurred during the teaching of the Undetect level, then the signal intensity was greater than or
equal to the threshold level. In either case, repeat the teach function to properly set the levels.
Output Signals
Discrete Output
The discrete output is a PNP/NPN configuration allowing the user to provide a load on this output
that is either pulled high to VDC or low to ground. The sensor monitors this level and automatically
determines whether to operate the PNP/NPN driver. This output is typically connected to a PLC.
The output remains active as long as the intensity level exceeds the threshold, in high-speed
applications it may be useful to use the Extend Output Pulse feature to lengthen the signal duration
to meet acquisition requirements of the PLC.
CAUTION: The discrete output must not be connected to outputs from other sensors (i.e. outputs
from multiple sensors must not be connected in parallel). Parallel connections may
damage sensor output circuitry.
