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Operating Instructions
Chapter
8
CLV490 Bar Code Scanner
8009993/RA61/2007-07-20
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8-1
Troubleshooting
8
Troubleshooting
8.1
Overview of possible errors and malfunctions
8.1.1
Mounting errors
•
CLV490 aligned incorrectly with the object carrying the bar code (e. g. blanking)
•
Reading pulse sensor positioned incorrectly (e. g. internal reading interval starts too
soon or too late)
•
With event-controlled focus control: sensors for object height detection positioned
incorrectly
8.1.2
Electrical installation errors
•
Interfaces on the CLV490 connected incorrectly (wiring error in CDB420 or CDM490)
8.1.3
Parameter errors
•
Functions not adjusted to local conditions, e. g. communication parameters on the host
interface are set incorrectly
•
Technical limits of the device exceeded, e. g. relationship between the scanning
frequency and the reading distance
8.1.4
Malfunctions
•
Start/stop mode: no external reading trigger, more than one object in the reading field
•
Tracking mode: gap between the objects in conveying direction fallen below minimum
•
Laser timeout for incorrectly terminated reading pulse exceeded
•
Device error (hardware/software)
8.2
Monitoring error and malfunctions
The CLV490 is self-monitoring:
•
After the power supply has been switched on, the CLV490 automatically carries out a
self-test, in which it checks important hardware components, before it is initialized
(parameter set loaded and device functions initialized). The self-test can be repeated
at any time by cancelling Reading mode. See
Chapter 6.5.13 Self-test, Page 6-57
•
If the CLV490 detects an error during the self-test or at any other time, it outputs the
error status ST= 3 on the host interface. Prerequisite: the error status is enabled for
transmission. This is disabled by default. The CLV490 displays the diagnosed error as
a numeric
combination via the auxiliary interface (see
.
•
While it is in operation, the CLV490 constantly monitors the laser diode and speed of
the polygon mirror wheel. In addition, a watchdog circuit responds to error statuses. The
CLV490 carries out referencing at regular cycles. To do so, the laser diode is switched
on for max. 10 s.
•
A timer (laser timeout) automatically deactivates the laser diode in Reading mode
("Sensor input" and "Serial interface trigger" mode) if the reading interval has not ended
after 10 minutes (default setting). However, it does not end the reading interval. In this
case, the CLV490 outputs the message:
"Laser safety timeout
"
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