SICK CLV490 Instrucciones de operaciones descargar pdf (Pagina 160)

Chapter 10 Operating Instructions

CLV 490 Bar Code Scanner

10-38

Appendix

10.4 Optional heating

10.4.1 Features

•

Integrated heater (permanently installed)

•

Wider range of applications for CLV: up to max. –35

•

Supply voltage 24 V DC +20 %/–10 %

•

CLV enabled via internal temperature switch (power-up delay approx. 35 ... 40 min. at

24 V DC and min. ambient temperature of –35

•

Required cable cross-section (power supply): min. 0.75 mm

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 CLV when the in-

ternal temperature rises above 7

C during the warm-up phase (approx. 35 min). The device

then performs a self-test and switches to Reading mode. The "Device Ready" LED lights up

to indicate that the device is ready.

When the internal temperature has reached approx. 25

C, a further temperature switch

deactivates the housing heater and reactivates it if necessary. Reading mode is not inter-

rupted as a result. The front window heater remains active constantly. The temperature cur-

ve inside the housing is shown in

Fig. 10-35.

Fig. 10-35: CLV with heater: temperature curve inside the housing

Temperature

inside housing

[

The temperature enables the operating

voltage for the CLV internally

Time [min]

1 2 ... 155 156 157 158 159 160 161 162 163 164 165 ... 213 214

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SICK CLV490 Instrucciones de operaciones Pagina 160

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