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Safety Mat Systems from Nelsa

What is a safety mat?
A safety mat is a simple and convenient method of providing a safeguard for persons working within or near a dangerous piece of machinery. A safety mat is a presence sensing safety device (PSSD) that detects the presence of someone or something within the protected area.

  1. What standards apply for safety mat systems?

      Class C Standards - Machine Specific

  2. What are the necessary features for safety mat systems?

    Provided the floor is reasonably flat, clean and free from debris, installation is simple and economical. Lay the mats on the floor, with the uniting trim between the mats. Ensure lead wires from the mat are located conveniently to enable interconnection. Connect all mats together using the connectors supplied and lay wires around the perimeter of the mat area. Place the surface trim around the perimeter of the area, ensuring that none of the wires are trapped, and that the trim is notched to allow the final wires to exit. Drill the floor and insert suitable hardware to secure the trim.

    Nelsa Eurozone Safety Mat Facts:

    Nelsa Eurozone Control Unit Facts:

Download Safety Relay Manual - Schleicher (779 KB)
Download Safety Relay Applications - Schleicher (692 KB)

Download Safety Switch Manual - Schmersal

Man-Machine Safeguarding Principles & Practices
  1. What are "positive-break" safety interlocks
    "Positive-break" safety interlocks are electromechanical switches designed with normally-closed (NC) electrical contacts which, upon switch actuation, are forced to open by a non-resilient mechanical drive mechanism. (Spring actuators are not considered positive-break mechanisms.)
    When "actuated" either situation may result in an unsafe condition due to failure to open normally-closed contacts. Consequently, such designs are not certified or recognized as suitable for safety applications.
  2. What is "positive-mode" mounting and why is it essential in safety applications?
    "Positive-mode" mounting assures that an electro-mechanical safety interlock switch is positively-actuated when equipment or machinery shut-down is desired.
  3. What are the risks of installing single-piece, safety interlock switches in the "negative mode"?
    When mounted in the "negative-mode", single-piece safety interlock switches can be easily defeated/circumvented by the operator…often simply by taping down the switch actuator when the safety guard is open.
  4. Self-Checking: The performing of periodic self-diagnostics on a safety control circuit to ensure critical individual components are functioning properly. Faults or failures in selected components will result in system shut-down.

  5. What is meant by "controlled access"?
    "Controlled access" generally refers to a movable machine guard that is designed such that it can only be opened under specific conditions. Typically such moveable guards restrict access to an area of a machine which continues to present a hazard to the operator immediately upon the removal of power. In these situations opening of the guard is prevented until the hazardous condition has abated.
  6. Why are safety interlock switches and safety circuit monitors required?
    1. All SCHMERSAL safety interlocks have been third-party tested and certified to meet relevant directives

Note: Reprinted from the Schmersal "Passport" Man-Machine Safeguarding Requirements & Techniques. (Fourth Edition)
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Automation Stock / Rome Electric
36 Westside Industrial Blvd.
Rome, GA 30165
Fax: 706-232-2071

Email: sales@automationstock.com


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Automation Stock / Rome Electric
36 Westside Industrial Blvd.
Rome, GA 30165
Fax: 706-232-2071
Email: sales@automationstock.com

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