Light Curtain Muting Standard

The timer monitoring the 4 seconds shall be a safety related item.

Light curtain muting standard.

When there is no access for persons but the access for products must be available a muting light curtain offers a perfect solution. This post will help clarify the difference between the two so the correct safety light curtain functionality is chosen and the machine runs safely. A safety light curtain shields a hazardous area for people s access. 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. Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met. With a muting light screen access to a hazardous area is temporarily disabled muting allowing products to enter the hazardous area. From the instant the first of the two muting sensors is cleared.

29 cfr 1910 212 states point of operation. 10 ma with edm. Muting sensors shall be positioned beyond the light curtain in the dangerous area. Muting for most of the stroke is required since the tooling will interrupt the light curtain during normal stroking of the press.

After 3 seconds the status output and mute function turn off. 10 to 30 v off voltage. Next lets test the mute function. Has a standard for this type of safeguarding device that is light curtains does 29 cfr 1910 212 now kick in.

Incandescent lamp 24 vdc 1 to 5 5 w led lamp load current. 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 shall be desabled as soon as the light curtain is cleared and not later than 4 seconds max. Setup of a muting light curtain.

In normal operation if a light curtain detects an object it causes the safety system to stop any hazardous motion in the hazardous area. Edm input wait input reset input muting input 1 2 override input. Muting allows the stock to bend and the operator to move through the light plane without stopping the press brake slide. The terms muting and blanking are frequently used incorrectly.

Osha was asked now that the u s. 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. In material handling applications material is allowed to pass through the protective field without shutting down the machine.

When using a pnp output cable. Open or 0 to 3 v short circuit current.