SICK Advanced Series

Operating Instructions Chapter 8
CLV490 Bar Code Scanner
8009993/RA61/2007-07-20 © SICK AG · Division Auto Ident · Germany · All rights reserved 8-15
Troubleshooting
1. The "Read Result" LED (default setting:
Good Read) does not light up at the end
of the reading pulse:
– continued –
Autofocus:
• An obstacle in the reading area is closer
to CLV490 than the object carrying the
bar code(s). The CLV490 focuses on the
obstacle and not on the object (autofo-
cus mode incorrectly parameterized).
• Autofocus parameters incorrectly
parameterized.
Event-controlled focus control:
• Wrong focus position in Distance
Configuration choosen.
• CLV490 does not switch over the focus
position: trigger source incorrectly pa-
rameterized.
• In the "CLV-Setup" program: choose the
R
EADING CONFIGURATION tab, AUTOFOCUS
section: "Differential background" select-
ed?
• In the "CLV-Setup" program: choose the
READING CONFIGURATION tab, AUTOFOCUS
section: click the A
UTOFOCUS PARAMETERS
button, click the AUTOFOCUS LIMITS PARAM-
ETERS button: are the values for limita-
tions and/or the autofocus space
correct?
Is the autofocus range within the limits of
the parameterized reading range?
• In the "CLV-Setup" program: choose the
R
EADING CONFIGURATION tab, click the DI-
STANCE CONFIGURATION button. Does the
focus position match the distance of the
object?
• In the "CLV-Setup" program: choose the
READING CONFIGURATION tab, FOCUS CON-
TROL section:
a) Trigger source "Inputs/Serial":
Check functional assignment of "IN 3"
and "IN 4" and connection of the sen-
sors. See Fig. 5-6, Page 5-23
b) Trigger source: "Serial interface":
Check the data connection to the host.
Use the "CLV-Setup" program to check
the host command strings: choose A
UXI-
LIARY INTERFACE tab. Choose MONITOR
HOST INTERFACE function. See
Chapter 6.5.10 Monitor Host Interface,
Page 6-54.
Download temporarily to CLV490!
c)Trigger source: Timer:
Check switchover time referred to the
start of reading interval
d) Line scanner with oscillating mirror:
Optional "Oscillating Mirror Extrema“ se-
lected?
Malfunction Possible cause Remedy
Table 8-8: Troubleshooting: result output errors in Reading mode (CLV490 in stand-alone configuration) (contd.)
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