How Safety Light Curtains Work?May 25, 2017June 25, 2017Work Lights

 Safety light curtains are a modern way of protecting personnel around many risky machines. Safety light curtains offer freedom just like temporary Construction Lights, flexibility and reduced operator tiredness when compared with traditional guarding methods, for example, mechanical barriers, sliding gates and pull-back restraints.

By reducing the need, where applicable, for solid guards, safety lights curtains merely simplify routine tasks like machine setup, maintenance and repairwork the same as construction light.

How The Safety Light Curtain Work?

A photoelectric transmitter projects an array of synchronised, parallel infrared light beams to a receiver unit. When an opaque object blockbeams in the sensing field, the control logic of the light curtain then sends a stop signal to the protected machine.

The transmitter unit has light emitting diodes (LEDs) that produce pulses of invisible infrared light when energised by the light curtain’s timing and logic circuitry. The light pulses are both sequenced – one LED is energised after another – and modulated – pulsed at a particularrate. The corresponding phototransistors and assisting circuitry in the receiving unit are made in such a way that they detect only the particular pulse and frequency made for it. These methodsprovide enhanced safety and rejection of external light sources. The control logic, user controls and diagnostic signals may be contained in a different enclosure or be closed together in the same housing as the receiver electronics.

The use of construction light Safety light curtains is Control Reliable. Control Reliability is the machine capability to control components and related interfacing to attain a safe state in the event where a failure occurs within their safety-related functions.

In contrast to photoelectric sensors, light safety curtains use self-checking circuitry to monitor the light curtains for internal faults. If an internal error is identified, the light safety curtain in an instantcommunicates a stop signal to the guarded machine. The light curtain then places itself in a lockout condition. Only after replacement of the failed component and an appropriate reset will the light curtain be restored to operating condition. Another example of safety monitoring are the safety redundant safety outputs as done using construction light.

Typical Applications
Protecting an operator from the risk associated with material positioning or where a process is performed is known as the point of operation guarding. Construction light is Another name for the point of operations is the zone of hazardous operation or the pinch point. This design of safeguarding is associated with mechanical and hydraulic power presses,  forming,  moulding presses, stamping, riveting, automated assembly machinery and eyelet. Light curtains used in these applications are chosen for finger and hand safety.

Perimeter guards safeguard the edge or boundary defined by a robot machine or other equipment. In these applications, light curtains are usually selected to detect the presence of personnel and signal the device controller to hinder hazardous conditions while staff are present within the safeguarded area. The light curtain reset switch also must be located outside and around the view of the protected area to avoid an inadvertent resumption of machine movement. Light curtains for perimeter guarding applications are chosen for torso detection although you can still use construction light. Check this site : http://www.larsonelectronics.com/c-603-temporary-construction-lights.aspx

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