Elevating platforms, hydraulic drives, measurement stands, construction machines, or cranes are typical examples of plants whose control systems require precise positional and path information – but which do not have a continuous measurement path as a result of articulated or hinged mechanisms. The new BTF/PRF wire-draw encoders offer tailor-made opportunities for precise path measurement and position detection.
Drum rotations are the measure of all things
With wire-draw encoders, a rust-free steel cord led along the measurement path is wound in or out of a drum in a single layer. The number of drum rotations (proportional to the length) is counted by an encoder and converted to a measurement signal. Even without a straight linear path this provides precise positional and path data, and thus information e.g. on the platform height of an elevating platform, the movement of travelling mechanisms, the position of a dredging shovel, or that of a crane’s gripper. In order to allow the device to ignore the demanding application conditions, these wire-draw encod-ers have a robust housing with an enclosure rating of IP 64, a dirt scraper, and an inte-grated chamber for cable grease.
Available with absolute or incremental encoder
Depending on the preferred measurement length and the desired position formation, the user can choose between BTF absolute wire-draw encoders (a combination of an MRA-F wire-draw mechanism with an ATM60 series absolute encoder) and PRF incremental wire-draw encoders (a combination of an MRA-F wire-draw mechanism with a DRS60 series incremental encoder). With Profibus, CANopen or DeviceNet fieldbus technolo-gies; the SSI interface; the absolute and HTL or TTL interfaces of incremental wire-draw encoders, the appropriate interface for data transmission is available for any particular application.Wide range of uses
The wide variety of types of BTF/PRF wire-draw encoders available opens up numerous application opportunities, such as for presses, extrusion machines, high-bay ware-houses, theatre stages, medical technology, locks and barrage systems, and in numer-ous other applications and branches.
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