Operating Instructions
Chapter
8
CLV 490 Bar Code Scanner
8 009 993/O824/20-12-2004
©
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 CLV than the object carrying the bar
code(s). The CLV focuses on the obsta-
cle and not on the object (autofocus
mode incorrectly parameterized).
•
Autofocus parameters incorrectly
parameterized.
•
Distance measurement (needed for au-
tofocus function) inactive.
Event-controlled focus control:
•
Wrong focus position in Distance
Configuration choosen.
•
CLV does not switch over the focus posi-
tion: trigger source incorrectly parame-
terized.
•
In the "CLV-Setup" program: choose the
R
EADING
C
ONFIGURATION
tab, A
UTOFOCUS
section: "Differential background" select-
ed?
•
In the "CLV-Setup" program: choose the
R
EADING
C
ONFIGURATION
tab, A
UTOFOCUS
section: click the A
UTOFOCUS
P
ARAMETERS
button, click the A
UTOFOCUS
L
IMITS
P
ARAM
-
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
C
ONFIGURATION
tab, A
UTOFOCUS
section, click the A
UTOFOCUS
P
ARAMETERS
button, click the A
UTOFOCUS
O
PTIMIZATION
P
ARAMETERS
button: is the distance mea-
surement active?
S
OURCE
OF
DISTANCE
INFORMATION
section:
"internal/external" selected?
•
In the "CLV-Setup" program: choose the
R
EADING
C
ONFIGURATION
tab, click the D
I
-
STANCE
C
ONFIGURATION
button. Does the
focus position match the distance of the
object?
•
In the "CLV-Setup" program: choose the
R
EADING
C
ONFIGURATION
tab, F
OCUS
C
ON
-
TROL
section:
a) Trigger source "Inputs/Serial":
Check functional assignment of "IN 3"
and "IN 4" and connection of the sen-
sors. See
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
I
NTERFACE
tab. Choose M
ONITOR
H
OST
I
NTERFACE
function. See
Chapter 6.5.10 Monitor Host Interface,
Page 6-55
.
Download temporarily to CLV!
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 (CLV in stand-alone configuration) (contd.)
