2015/12
3.4
Alignment
It should be ensured during installation of the device that the overlap flow passes parallel to the basic unit, or to its underside (see fig. 5
left).
Fig. 5:
OPSL 775 - Correct alignment
4
Commissioning
As it is relatively difficult to check the apparent optimum settings for influence or effectiveness with regard to the respective intended
use, it is recommended that all setting procedures are performed with a defined reference sample. Furthermore, we recommend the
utilization of an oscilloscope to facilitate convenient visualization of the progress of the "Edge detected" output signal (pin 4) in relation
to the reference sample.
4.1
Calibrating the working distance
Following installation/mounting, the device must be calibrated to the specified working distance. The actual calibration is performed
automatically. A
sheet of white paper
is used as a
reference surface
.
The following steps are to be performed for calibration:
1.
Set the
Sens
potentiometer for sensitivity to the middle position.
2.
Place a sheet of white paper flat underneath the device so that the laser beam is directed onto it.
3.
Press the
CAL
calibration button briefly once (> 50ms).
The status display is illuminated momentarily for the duration of the calibration procedure.
ALTERNATIVE
: Apply a high signal (12 ... 30VDC) for a period of > 1s at the input
CAL
(Pin 2).
Calibration is concluded and it should now be possible to count the edges in the overlap flow with a constant working distance. Under
certain circumstances, the calibration procedure may have to be repeated. In the event that no edges can be detected, please refer to
the procedure for setting the OPSL 775 in section 5.
4.2
General
There are three possibilities for optimum adaptation of the device for the specified counting tasks:
1. Setting the sensitivity
allows detection or suppression of small or less distinct edges.
2.
A program is available which can be selected to perform a
dynamic adaptation of the output pulse width
automatically in
correlation with the sequential speed of the edges (recommended operating mode).
3.
The device also offers the possibility of
setting the desired output pulse width manually
. This function is particularly suited
for more difficult application conditions as a blockage time for the suppression of faulty pulses can be set simultaneously with
a fixed output pulse width independent of the sequential speed of the edges.
OPSL 775
OPSL 775
CORRECT
INCORRECT
OPSL 775
