SICK CLV490 Instrucciones de operaciones descargar pdf (Pagina 208)

Chapter 10 Operating Instructions

CLV490 Bar Code Scanner

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

(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]

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 269 270

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SICK CLV490 Instrucciones de operaciones Pagina 208

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