Operating Instructions
Chapter
4
CLV 490 Bar Code Scanner
8 008 796/0000/25-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
4-9
Installation
Performing fine adjustment:
11. Align the CLV in such a way that the angle between the scan line and the bars on the
bar code CLV is almost 90
°
. The oscillating mirror must be aligned in such a way that
the scan line is located at the center of the bar code, perpendicular to the bar code li-
nes, when it is in the neutral position (CW = 50).
12. To avoid interfering reflections, tilt the line scanner away from the vertical axis so that
the light strikes the bar code at an angle of approx. 105
°
(see
).
13. If necessary, position the scan line exactly at the direct center of the bar code.
below.
14. Move objects carrying bar codes into the CLV reading field manually under realistic
conditions and check the reading result. If the objects are aligned randomly, or if the bar
code is located at different positions (angles), ensure that the limit values of the
permissible reading angles are not exceeded.
15. Adjust the CLV in such a way that the good read rate is between
70... 100%
.
With event-controlled dynamic focus control, for each defined reading range (distance
configuration), check the selected focus position and correct the parameter settings if
Chapter 6.4.4 Guide to parameterization menu, Page 6-8
).
16. Tighten the screws on the CLV.
The CLV is aligned with the bar code.
4.3.3
Adjusting mode
The "Adjusting mode" helps you to position the
center
of the scan line on the object. To do
so, the CLV masks out one half of the scan line from the center (code position CP = 50 to
CP = 100). This is irrespective of whether the CLV is operated in Autofocus mode or with
distance configurations for event-driven dynamic focus control.
shows the resulting
position of the scan line (line scanner).
Line scanner with oscillating mirror:
In "Adjusting" mode, the oscillating mirror behaves in the same manner as within the ”Per-
cent Evaluation” mode (
see Page 4-8, ”Activating Percentage Evaluation mode”).
1.
Activate the operating mode as described in
Chapter 6.5.3 Adjusting mode, Page 6-24
.
2.
Position the CLV in such a way that the center of the scan line, indicated by the end of
the scan line (code position CP = 50), is located at the center of the bar code, or at the
center of the field for all codes if several bar codes are used.
Fig. 4-9:
Line scanner: scan line in Adjusting mode
CP = 100
CP = 50
CP = 0
Adjusting mode
Range masked out
Scan line