Machinery Safety 101

Guarding Emergency Stop Devices

Emergency Stop on machine console
This entry is part 3 of 16 in the series Emer­gency Stop

Can emer­gency stop devices that a prone to unin­ten­ded oper­a­tion be guarded? Find out!

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Interlock Architectures – Pt. 3: Category 2

ISO 13849-1 Figure 10
This entry is part 3 of 8 in the series Cir­cuit Archi­tec­tures Explored

This art­icle explores the require­ments for safety related con­trol sys­tems meet­ing ISO 13849 – 1 Cat­egory 2 require­ments. “Gotcha!” points in the defin­i­tion are high­lighted to help design­ers avoid this com­mon pit­falls.

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Five things most machine builders do incorrectly

Five things that most machine build­ers fail to do. With a Sixth Bonus fail­ure!

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Interlock Architectures – Pt. 2: Category 1

This entry is part 2 of 8 in the series Cir­cuit Archi­tec­tures Explored

This art­icle expands on the first in the series “Inter­lock Archi­tec­tures – Pt. 1: What do those cat­egor­ies really mean?”. Learn about the basic cir­cuit archi­tec­tures that under­lie all safety inter­lock sys­tems under ISO 13849 – 1, and CSA Z432 and ANSI RIA R15.06.

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Interlock Architectures – Pt. 1: What do those categories really mean?

Basic Stop/Start Circuit
This entry is part 1 of 8 in the series Cir­cuit Archi­tec­tures Explored

In 1995 CEN pub­lished an import­ant stand­ard for machine build­ers – EN 954 – 1, Safety of Machinery – Safety Related Parts of Con­trol Sys­tems – Part 1: Gen­er­al Prin­ciples for Design. This stand­ard set the stage for defin­ing con­trol reli­ab­il­ity in machinery safe­guard­ing sys­tems, intro­du­cing the Reli­ab­il­ity cat­egor­ies that have become ubi­quit­ous. So what do these cat­egor­ies mean, and how are they applied under the latest machinery stand­ard, ISO 13849 – 1?

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Interlocked gate testing

Did you know that inter­locked gates require stop­ping per­form­ance test­ing?

Machinery needs to be able to stop in the time it takes a per­son to open the guard and reach the haz­ard. If the dis­tance from the guard open­ing to the haz­ard is short enough that a per­son can reach the danger point before the haz­ard can be con­trolled, the guard is use­less. The res­ult­ing situ­ation may be worse

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Checking Emergency Stop Systems

Control Panel with Emergency Stop Button.
This entry is part 2 of 16 in the series Emer­gency Stop

This short art­icle dis­cusses ways to test emer­gency stop sys­tems on machines.

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Update on EN ISO 13849 – 1 Mandatory Implementation Date

The machinery world con­tin­ues to wait for the European Com­mis­sion to reveal the new Man­dat­ory Imple­ment­a­tion Date for EN ISO 13849 – 1.

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More flip-flopping on EN 954 – 1?

In recent posts I’ve been dis­cuss­ing the changes in the use of EN 954 – 1, Safety of Machinery – Safety Related Parts of Con­trol Sys­tems. Part 1: Gen­er­al Prin­ciples for Design. The EU ori­gin­ally announced that this stand­ard was to be with­drawn on 31-Dec-09, being replaced by EN ISO 13849 – 1. As you may know, there are sig­ni­fic­ant dif­fer­ences in these two stand­ards.

A later announce­ment from the European Com­mis­sion repealed

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EU changes direction on EN ISO 13849 – 1

Update on EN ISO 13849 – 1 man­dat­ory imple­ment­a­tion date.

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