Light Curtain Muting Requirements

Emergency stop of hazardous motion initiated by an e stop button.

Light curtain muting requirements.

This post will help clarify the difference between the two so the correct safety light curtain functionality is chosen and the machine runs safely. The motion is allowed to coast to a stop. Light curtains must be properly integrated into the machine. From the instant the first of the two muting sensors is cleared.

Emergency stop of hazardous motion initiated by an e stop button. Muting for most of the stroke is required since the tooling will interrupt the light curtain during normal stroking of the press. In material handling applications material is allowed to pass through the protective field without shutting down the machine. After 3 seconds the status output and mute function turn off.

Muting shall be desabled as soon as the light curtain is cleared and not later than 4 seconds max. First we test the safety light curtain and latch reset with mute off. Safety light curtains are an advanced method of safeguarding personnel around many hazardous machines. Also the status output for the mute light changes to green.

At this point the light curtain is muted with the die no more than 1 4 above the workpiece or automatically turned off. 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. Also called light screens optical guards and presence sensing devices safety light curtains offer freedom flexibility and reduced operator fatigue when compared with traditional guarding methods such as mechanical barriers sliding gates and pull back restraints nbsp.

Muting allows the stock to bend and the operator to move through the light plane without stopping the press brake slide. The timer monitoring the 4 seconds shall be a safety related item. Safety related stop of hazardous motion initiated by a light curtain. Muting sensors shall be positioned beyond the light curtain in the dangerous area.

This system executes a stop category 0 stop. Next lets test the mute function. Light curtains optional functions as listed in annex a of iec 61496 part 1 must comply with annex a requirements. Safety function requirements interrupting the light curtain stops and prevents hazardous motion by removal of power to the motor.

Muting of a light curtain. Safety function requirements interrupting the light curtain stops and prevents hazardous. Emergency stop of hazardous motion initiated by a light curtain. The terms muting and blanking are frequently used incorrectly.