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Interpreting vibration spec

Interpreting vibration spec

(OP)
Hi All

I have an environmental specification for a PLC which I'm struggling to interpret.

Vibration
Functional Stress
5Hz to 9Hz
Continuous
1.7mm amplitude
Occasional
3.5mm amplitude
Withstand
10Hz to 150Hz
Acceleration
0.1g
Endurance
10Hz to 150Hz
Acceleration
0.5g

What are the definitions of Functional Stress, Withstand and Endurance?
Any help appreciated.

Cheers
elbrownos

RE: Interpreting vibration spec

I'd contact the manufacturer, because otherwise you are guessing.

But if I were guessing (who can resist?),

"functional" levels are the vibration frequencies and amplitudes under which the unit is verified to remain functional, i.e. control of your process is continued un-interrupted. Likely, the 5-9 Hz range is where the relay outputs are resonant, and amplitudes somewhere above those listed may cause intermittent, unintentional, open/close of the relay contacts.

"withstand" - unit is rated to withstand these levels, though function is not guaranteed, without sustaining permanent damage. Most likely set by a combination of testing and stress/fatigue analysis.

"endurance" - likely a level of acceleration verified by testing over some fixed duration, below these levels no failures were observed.

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