Light Curtain Muting Circuit

If it s muted for too long the curtain will allow access to the safety hazard and obviate its purpose.

Light curtain muting circuit.

When a fault in the internal circuitry or an output is detected the light curtain responds by turning off its ossd outputs. From the instant the first of the two muting sensors is cleared. First we test the safety light curtain and latch reset with mute off. The light curtain s ossd outputs turn on once its field of view is no longer interrupted.

In normal operation if a light curtain detects an object it causes the safety system to stop any hazardous motion in the hazardous area. 29 cfr 1910 217 c 3 iii d the safety distance d s from the sensing field to the point of operation must be greater than the distance determined by the safety distance formula. Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met. The muting circuit for the light curtain must also be appropriately configured for the discrete item s transition speed so that the curtain doesn t remain in a deactivated state.

Muting or bypassing of the psd during the upstroke of the press slide is permitted for parts ejection circuit checking and feeding. The timer monitoring the 4 seconds shall be a safety related item. The terms muting and blanking are frequently used incorrectly. Safety light curtains reliably and cost effectively protect against access into hazardous points and areas.

Also the status output for the mute light changes to green. In material handling applications material is allowed to pass through the protective field without shutting down the machine. Depending on the variant different machine functions are integrated or can be selected via safe control solutions. It sounds easy but configuring a muting circuit appropriately.

Safety light curtains can be used in a variety of different modes such as muting blanking and floating blanking depending on the needs of the application. The range from small and compact types to extremely robust and resistant variants that withstand special ambient conditions up to the highest safety level. When enabled a function block is purple with a 3 second count down timer. The light curtain monitors its internal circuitry and its ossd ou tputs for faults.

Light curtain with muting two sensor l type and configurable safety relay introduction light curtains are used to detect attempted access to a hazardous area. Muting sensors shall be positioned beyond the light curtain in the dangerous area. After 3 seconds the status output and mute function turn off.