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Old 07-04-2019, 10:56 AM   #1
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Default Machine saftey category 3

I was looking for work in industrial field. employer ask if I am aware of Machine safety cat 3. If anybody knows about that category?
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Old 07-04-2019, 11:17 AM   #2
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Do you know anything about machine safety?

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Old 07-04-2019, 11:21 AM   #3
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Probably need to read up on all the categories. The company probably uses 3 as a target, and wants to know you understand stuff like safety relays or redundancies.

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Old 07-04-2019, 11:35 AM   #4
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https://machinerysafety101.com/2011/...-architecture/
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Old 07-04-2019, 01:24 PM   #5
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Yes, I was aware of machine safety but was not aware of categories.
so far what I dig out. is...

CATEGORY 1: “A single fault can lead to the loss of safety function.”
Example: A door switch contact failing in the closed position resulting in the machine continuing to run
CATEGORY 2: “A single fault can lead to the loss of safety function and the loss of safety function shall be detected.”
Example: A door switch contact failing in the closed position resulting in the machine continuing to run but a second door switch triggers a warning light.
CATEGORY 3: “A single fault does not lead to the loss of safety function.”
Example: a door switch contact failing in the closed position but a second door switch alerts a safe controller which shuts down the machine. The distinguishing detail from Category 4 is that there can be multiple switches used on each channel of the controller.
CATEGORY 4: “An accumulation of safety faults does not lead to the loss of safety function.”
still digging out more...
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Old 07-04-2019, 01:41 PM   #6
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What category is "spontaneous, rapid, self disassembly"?
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