Light curtain calculation depth penetration factor

Picture finger tips passing through an open window blind—the left-to-right slats of the blind are analogous to two adjacent beams of light. Got it, continue to print. Safety light curtains control access to the potentially dangerous work areas by using infrared light beams to create a safety field across the entrance of a machine. Similarly, on gap presses, the part often exits on the side opposite the feed, which creates a similar hazard. Opt for Type 2 safety light curtains for hand and body protection where there is a low risk factor.
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Basic Calculation Examples

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SAFETY IN NUMBERS: Stop Time Measurements

Preventing Reach-In The last issue to address involves preventing operators from reaching around the light curtain or moving between the curtain and the hazard when the light curtain has been positioned away from the press. The scanner determines distances from the object during the time elapsed from emission to reception. Stop time measurement is able to detect changes at an early stage, so that appropriate action can then be taken. The lights are set up with manual-reset fault logic. Calculate the additional time as follows: Another important element of the calculation is the depth penetration factor D pf.
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Safety Light Curtains: One Way to Safeguard Your Machines | TecTalk Blog

Safeguard devices should be mounted so that their protective field is located farther from the hazard than the calculated minimum safety distance. The opening through the guarding—whether a light curtain or physical barrier—must be large enough to allow the parts to escape. However, muting is permitted only during the nonhazardous portion of the machine cycle. Featured Posts Featured Posts. The overall stopping time of the system, T, with the exception of , the response time of the safeguarding device used, has been determined from the device data sheets and documentation as follows:.
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With nearly all solid-state controls, when the press stops the monitor measures the elapsed time and compares it to a maximum allowable value preset by the press manufacturer. The official publication of Precision Metalforming Association. Special features and improved direction through regulations and national consensus standards help match a safety light curtain to its intended use. Safe Speed Safeguarding is based on a ram speed of 10mm per second or less, providing that speed is carefully monitored. The first is reaching the dies from the back. The interlock is required because safety blocks are very seldom designed to hold the full working-force of the press please refer to our Die Safety Blocks blog for additional information.
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