SITEMA Knowledge Base

Here to answer all your questions regarding SITEMA safety solutions.

Archives

How Do You Unlock the Sitema Safety Catcher?

Nov 16, 2017

If the SC is holding a load? You must first apply release pressure and then move the axis upward. At
this time, you should be monitoring the “Unlocked” proximity switch indicating the status condition.

However, if the SC is not holding a load and merely at zero pressure, then apply release pressure and
monitor switch for the Unlocked condition.



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What is the Typical Reaction Time of the Safety Catcher?

Nov 16, 2017

The typical reaction time of the SITEMA Safety Catcher is approximately 150msec.

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What is the Maximum Force Mounting Components Should Be Designed For?

Nov 16, 2017

All mounting bracketry should be design for 4xM in the event of an overload condition.

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What Happens if Oil Gets on the Shaft? Do I Lose Holding Capacity?

Nov 16, 2017

No, the influence of mineral oil on the shaft is insignificant.

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How Do I Size the Safety Catcher?

Nov 16, 2017

Admissible Load (M) sizing is determined by the platen weight + tooling weight and anything mounted to the platen.

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What is the Safety Factor of the Safety Catcher?

Nov 16, 2017

Factor of 100% is included. Minimum holding is 2 x M (admissible load) max holding is 3.5 x M. Force test required is 1.5 x M.

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Are Safety Catchers Used for Accurate Positioning?

Nov 16, 2017

No, the clamp system requires approximately ½ inch of downward movement to develop full holding. The SC’s are single acting and only hold against gravity.

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