Light Curtain Muting Requirements

Safety function requirements interrupting the light curtain stops and prevents hazardous motion by removal of power to the motor.

Light curtain muting requirements.

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. 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. This system executes a stop category 0 stop.

Safety related stop of hazardous motion initiated by a light curtain. Emergency stop of hazardous motion initiated by a light curtain. The terms muting and blanking are frequently used incorrectly. At this point the light curtain is muted with the die no more than 1 4 above the workpiece or automatically turned off.

Muting shall be desabled as soon as the light curtain is cleared and not later than 4 seconds max. Emergency stop of hazardous motion initiated by an e stop button. Muting allows the stock to bend and the operator to move through the light plane without stopping the press brake slide. Muting for most of the stroke is required since the tooling will interrupt the light curtain during normal stroking of the press.

Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met. When enabled a function block is purple with a 3 second count down timer. Muting of a light curtain. From the instant the first of the two muting sensors is cleared.

The motion is allowed to coast to a stop. Also the status output for the mute light changes to green. Safety function requirements interrupting the light curtain stops and prevents hazardous. Two sensor l type muting of a light curtain.

First we test the safety light curtain and latch reset with mute off. Next lets test the mute function. Muting sensors shall be positioned beyond the light curtain in the dangerous area. After 3 seconds the status output and mute function turn 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. Emergency stop of hazardous motion initiated by an e stop button. 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. Light curtains must be properly integrated into the machine.