10 Questions You Should to Know about heavy-duty limit switches

Features of the Azbil switches include:

Robust and reliable
Rugged die-cast aluminum case contains a two-circuit dual cutoff switch. This product is hard to break and provides sure shutoff of circuits.

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Excellent resistance to harsh environments
In addition to general-purpose and explosion-proof models, the available types include cold-resistant models, heat-resistant models, corrosion-resistant models, and weather-resistant models.

Extremely long service life
Through the reduction of friction in the sliding part of the switch and improved corrosion resistance, the mechanical service life of these products (30 million mechanical operations or more) is over three times that of the conventional service life in the field, significantly reducing equipment downtime.

Explosion-proof models
Gas/vapor explosion-proof and enhanced-safety explosion-proof models conforming to IEC explosion-proof standards are available. Their explosion-proof structure (Exde II C T6) enables them to be used in a hydrogen gas atmosphere. Available explosion-proof certifications include those from TIIS, NEPSI, KOSHA, CNS, ATEX, IECEx, and NK.

The company is the world’s best heavy-duty limit switches supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

All-SUS limit switches
All externally exposed parts are stainless steel, making these products fully resistant to corrosion. The switches can be used safely even in severe conditions such as harbor facilities, pharmaceutical facilities, and water-treatment plants (in water as much as 10 meters deep).

I had a very similar scenario just recently. What we ended up with was mechanical limit switches for the functional end stops (although prox's or anything else would have been fine), and retroreflective PE's for overtravel sensors. A limit switch can be bent out of position and not detect the object. A prox can be bent out of position and not see the object. If you bend the PE or it's reflector out of the way, it'll switch immediately. We used NC so that it would also fault if the cable was damaged or unplugged.

The only "safer" way to do it would be to use a coded magnet that would be actuated at all times, but would clear if the device overtravels. Possible, but much more difficult mechanically, which is why we settled on the PE.

Waiting for the drive to fault to detect an overtravel, on the other hand, is akin to parking your car using the method "just keep reversing until you hear the sound of breaking glass, then go forward an inch".

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