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Draw-wire sensor

Flexible installation in tight spaces

The SZG81 - WDGA CANopen draw-wire system from Wachendorff Automation was developed for use in harsh environments. It can be used even where space is tight, due to its dimensions.

The draw-wire system is equipped with a absolute encoder (Photo: Wachendorff)

THE VARIOUS METHODS OF INSTALLATION mean flexibility: wire exit up, down, forward, and backward are possible. An absolute encoder of the WDGA family with EnDra technology is already installed in this system designed as needed for CANopen, SSI, or Profibus-DP. The CiA 301 communication profile is supported, as well as the CiA 406 version 3.2 device profile for encoders. A bit rate from 10 kbit/s to 1 Mbit/s is possible with automatic bit-rate detection. The standard settings as well as any customization in the software can be changed via LSS (CiA 305) and the SDO protocol, e.g. PDOs, scaling, Heartbeat, Node-ID, bit rate, etc. synchronous and asynchronous CAN transmission modes are available.

The draw-wire system provides length measurements from 0 mm to 6,250 mm with all advantages that result from an absolute length measurement. For example, the position value is saved even if the power supply fails and is available immediately once power is restored. This means it is not necessary to perform a reference run and the process can go on without delay. The resolution can be freely configured by the user and changed at any time.

An tuned spring suspension with protection class IP65 and a nylon-coated stainless steel wire cable guarantee a long service life, even in difficult operating conditions and in a temperature range from -40 °C to +80 °C. Possible areas of application include elevators, lifting platforms, theatre stages, fork lifts, and cranes.

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Trafag  DIS - Dewit Industrial Sensors