Light Curtain Muting Requirements

Muting sensors shall be positioned beyond the light curtain in the dangerous area.

Light curtain muting requirements.

Muting for most of the stroke is required since the tooling will interrupt the light curtain during normal stroking of the press. Muting shall be desabled as soon as the light curtain is cleared and not later than 4 seconds max. Safety related stop of hazardous motion initiated by a light curtain. At this point the light curtain is muted with the die no more than 1 4 above the workpiece or automatically turned off.

Our standard s difficulty here is that 1910 217 c 3 iii d allows muting on the upstroke and this application requires muting during over a much longer portion of the cycle. Muting of a light curtain. Two sensor l type muting of a light curtain. This system executes a stop category 0 stop.

Emergency stop of hazardous motion initiated by an e stop button. From the instant the first of the two muting sensors is cleared. Safety function requirements interrupting the light curtain stops and prevents hazardous. Light curtains optional functions as listed in annex a of iec 61496 part 1 must comply with annex a requirements.

The timer monitoring the 4 seconds shall be a safety related item. The motion is allowed to coast to a stop. Light curtains must be properly integrated into the machine. 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. First we test the safety light curtain and latch reset with mute off. After 3 seconds the status output and mute function turn off. 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.

Emergency stop of hazardous motion initiated by an e stop button. Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met. 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. Safety function requirements interrupting the light curtain stops and prevents hazardous motion by removal of power to the motor.

This post will help clarify the difference between the two so the correct safety light curtain functionality is chosen and the machine runs safely. Muting allows the stock to bend and the operator to move through the light plane without stopping the press brake slide. Next lets test the mute function. Emergency stop of hazardous motion initiated by a light curtain.