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Chapter
10
Operating Instructions
CLV490 Bar Code Scanner
10-40
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Appendix
10.4
Optional heating
10.4.1
Features
•
Integrated heater (permanently installed)
•
Wider range of applications for CLV490: up to max. –35
°
C (–31
°
F)
•
Supply voltage 24 V DC +20 %/–10 %
•
CLV490 enabled via internal temperature switch (power-up delay approx. 35 to 40 min.
at 24 V DC and min. ambient temperature of –35
°
C (–31
°
F))
•
Required cable cross-section (power supply): min. 0.75 mm
2
(approx. 20 AWG)
10.4.2
Design
The heating system comprises two parts:
•
the front window heater
•
the housing heater
The optional heating system is installed and tested at the factory. The user cannot install it
on site.
10.4.3
Function
When the 24 V DC supply voltage is applied, a temperature switch first supplies electric
current to the heater only. This switch enables the supply voltage for the CLV490 when the
internal temperature rises above 7
°
C (+44.6
°
F) during the warm-up phase (approx. 35
min). The device then performs a self-test and switches to Reading mode. The "Device Rea-
dy" LED lights up to indicate that the device is ready.
When the internal temperature has reached approx. 25
°
C (+77
°
F), a further temperature
switch deactivates the housing heater and reactivates it if necessary. Reading mode is not
interrupted as a result. The front window heater remains active constantly. The temperature
curve inside the housing is shown in
.
Fig. 10-35: CLV490 with heater: temperature curve inside the housing
+40
+30
+20
+10
0
-10
-20
-30
-40
104
86
68
50
32
14
-4
-22
-40
40
80
Temperature
inside housing
The temperature enables the operating
voltage for the CLV490 internally
Time (min)
[
°
C]
[
°
F]
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