SITEMA Knowledge Base & FAQs

Here to answer all your questions regarding SITEMA safety solutions.

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SITEMA Knowledge Base & FAQs

How Safety Catchers’ Self-Intensifying Technology Secures Heavy Loads

The self-intensifying technology of safety catchers is a fail safe principle that is similar to a wedge system--as the load continues to increase, the safety catcher continues to hold the rod in a fixed position until hydraulic or pneumatic pressure is restored.

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SITEMA Knowledge Base & FAQs

How Do You Unlock the Sitema Safety Catcher?

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.

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SITEMA Knowledge Base & FAQs

Are Safety Catchers Used for Accurate Positioning?

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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SITEMA Knowledge Base & FAQs

What is the Safety Factor of the Safety Catcher?

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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SITEMA Knowledge Base & FAQs

How Do I Size the Safety Catcher?

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

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SITEMA Knowledge Base & FAQs

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

No, the influence of mineral oil on the shaft is insignificant. and you will not lose holding capacity.

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SITEMA Knowledge Base & FAQs

What Control Circuit Do You Recommend for the Sitema Safety Catcher?

sitema safety catcher recommended control circuit diagram

 

* In case Impact noises due to excess pressure are audible when pressurizing the Safety Catcher, these can be suppressed by means of a flow control valve in the p-line

**…

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SITEMA Knowledge Base & FAQs

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

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

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SITEMA Knowledge Base & FAQs

What is the Typical Reaction Time of the Safety Catcher?

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

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SITEMA Knowledge Base & FAQs

How Far Does the Load Sink When the Safety Catcher is at Zero Pressure?

Typical travel without the optional Spring Base is between 5 and 15mm…with the Spring Base, an additional 6-10mm depending on the size. Full travel with the Spring Base option is can range between 10-25 mm depending on type and size. If the Catcher does not bottom out/compress the Spring Base fully, then release pressure…

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