Light Curtain Muting Circuit

This post will help clarify the difference between the two so the correct safety light curtain functionality is chosen and the machine runs safely.

Light curtain muting circuit.

From the instant the first of the two muting sensors is cleared. Muting sensors shall be positioned beyond the light curtain in the dangerous area. The terms muting and blanking are frequently used incorrectly. 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.

The range from small and compact types to extremely robust and resistant variants that withstand special ambient conditions up to the highest safety level. In material handling applications material is allowed to pass through the protective field without shutting down the machine. The light curtain s ossd outputs turn on once its field of view is no longer interrupted. If it s muted for too long the curtain will allow access to the safety hazard and obviate its purpose.

Muting shall be desabled as soon as the light curtain is cleared and not later than 4 seconds max. 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. In normal operation if a light curtain detects an object it causes the safety system to stop any hazardous motion in the hazardous area.

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. When enabled a function block is purple with a 3 second count down timer. Safety light curtains reliably and cost effectively protect against access into hazardous points and areas. Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met.

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. The light curtain monitors its internal circuitry and its ossd ou tputs for faults. Also the status output for the mute light changes to green. It sounds easy but configuring a muting circuit appropriately.

Next lets test the mute function. First we test the safety light curtain and latch reset with mute off. Depending on the variant different machine functions are integrated or can be selected via safe control solutions.