SICK Advanced Series

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.
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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