02VA0175  Encoder working principle – Optical cable displacement sensor

02VA0175  Encoder working principle – Optical Yu cable displacement sensor Cable displacement sensor cable encoder cable encoder

The encoder is a rotary sensor that converts rotational displacement into a series of digital pulses that can be used to control angular displacement or, if combined with a gear bar or screw, to measure linear displacement. It is a rotary sensor that converts rotational displacement into a series of digital pulses that can be used to control angular displacement or, if the encoder is combined with a gear bar or screw, to measure linear displacement.

02VA0175  The electric signal generated by the encoder is processed by CNC, PLC, control system, etc. These sensors are mainly used in machine tools, material processing, motor feedback systems, and measurement and control equipment. The conversion of angular displacement in ELTRA encoder adopts the photoelectric scanning principle. The reading system is based on the rotation of the radial index plate, which consists of alternating light penetrating and light opaque Windows. The system is all illuminated vertically with an infrared light source, so that the light projects the image on the plate onto the surface of the receiver, which is covered with a layer of grating, called a collimator, which has the same window as the disc. The receiver’s job is to sense the changes in light caused by the rotation of the disc, and then convert the light changes into corresponding electrical changes. In general, the rotary encoder can also get a speed signal, which is fed back to the inverter to adjust the output data of the inverter.

02VA0175  Fault phenomenon: 1, when the rotary encoder is bad (no output), the frequency converter can not work normally, become very slow, and for a while the frequency converter protection, display “PG disconnect”… It’s the combination that makes the difference. To make the electrical signal rise to a higher level and produce a square-wave pulse without any interference, this must be handled by an electronic circuit. The connection between the encoder pg connection and the parameter vector frequency converter and the encoder pg must correspond to the model of the encoder pg. Generally speaking, the encoder pg model has three kinds of differential output, open-collector output and push-pull output, and the transmission mode of its signal must take into account the interface of the inverter pg card, so choose the appropriate pg card model or set it reasonably.