Light curtains require fewer supporting devices
19 October 2014
For smaller production plants, the additional time and effort needed for implementing safety measures is relatively high. A novel solution to this problem can be found in Panasonic's light curtain SF4C.
Emergency stop switches or safety door switches can be connected directly to this light curtain without need for a safety PLC. The additional contacts needed for monitoring the power relays can also be connected directly.
A total of six safety relays are normally needed to switch off a machine when up to three light curtains are mounted in cascade. Thanks to the SF4C, only tw safety relays are needed, reducing cost and wiring time.
It is also possible to dispense with signal towers, as the SF4C comes with externally controlled, highly visible red, yellow, and green LED signal lamps.
The SF4C series has safety class 4 (PLe, SIL3), a beam pitch of 10 and 20mm and a maximum protected height of 640mm. Additional features include muting, fixed and floating blanking, extraneous light check & avoid function, low weight thanks to the polycarbonate housing, an integrated error display and password protection.
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