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Replacing mechanical cam limit switches on cranes without PLC

For precise speed control in rolling mills the main drives of the roll stands and the coilers need to be equipped with an encoder. In addition, it is often necessary to provide increased protection for personnel during special operating modes, such as: For this application Johannes Hübner Giessen has been working with Motor OEMs for many decades to provide complete solution ie. Electrical and mechanical components.

Home  Case Studies Replacing mechanical cam limit switches on cranes without PLC

Replacing mechanical cam limit switches on cranes without PLC

Home    Case Studies    Pilger mill in tube rolling mills – hot and cold pipe detection

Pilger mill in tube rolling mills - hot and cold pipe detection

  • Position monitoring – also without PLC
  • Replacement for discontinued cam limit switches
  • Higher positioning accuracy
  • Suitable for 1:1 replacement

Before: Mechanical cam limit switch.

Challenges

  • Some mechanical cam limit switches deployed in cranes or in conjunction with an obsolete PLC have either been discontinued or the devices cannot be replaced for other reasons. In that case a solution is required that updates the position switches on the crane to a state-of-the-art technology – without extra construction effort.

After: The electronic position switch ERC 40 from Hübner Giessen as a 1:1 replacement solution.

Solution

  • With the electronic position switch ERC 40 from Hübner Giessen the user is now able to program the high precison switching points via software. The programming is easy and quick. At the same time, the values remain permanently in the system and cannot be affected by shock and vibration. 

    Other advantages are:

    • Real switches up to 230 V and 0.5 A – existing cables can be kept most of the time
    • Use the latest technology without converting to a (new) PLC at the same time

    The ERC 40 offers a suitable replacement system for many cranes and installation situations. This enables more flexibility, higher accuracy and less spare parts.

Products and Accessories

Case Studies

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