German heidenhain encoder

main function

It is a rotary sensor that converts the rotation displacement into a series of digital pulse signals. These pulses can be used to control the angular displacement. If the German heidenhain encoder is combined with a gear pin or a screw screw, it can also be used to measure straight lines. Displacement.

The German heidenhain encoder produces electrical signals and is processed by the digital control CNC, programmable logic controller PLC, control system, etc. These sensors are mainly used in the following areas: machine tools, material processing, motor feedback systems, and measurement and control equipment. In the ELTRA Germany heidenhain encoder, the angular displacement conversion adopts the photoelectric scanning principle. The reading system is based on the rotation of a radial index plate, which is composed of alternating light-transmitting windows and opaque windows. This system all uses an infrared light source to illuminate vertically, 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 optical disc. The job of the receiver is to feel the light change produced by the rotation of the disc, and then convert the light change into a corresponding electrical change. Generally, rotating the German heidenhain Heidenhain encoder can also get a speed signal, which has to be fed back to the inverter to adjust the output data of the inverter. Trouble phenomenon: 1. When the rotating German heidenhain encoder is broken (no output), the inverter cannot work normally and becomes very slow, and after a while, the inverter protects and displays "PG disconnection"...joint action can kick in. To make the electrical signal rise to a higher level and produce a square wave pulse without any interference, this must be processed by an electronic circuit. German heidenhain Heidenhain encoder PG wiring and the connection mode between parameter vector inverter and German heidenhain Heidenhain encoder PG must correspond to the model of German heidenhain Heidenhain encoder pg. Generally speaking, Germany heidenhain Heidenhain encoder pg models are divided into three types: differential output, open collector output and push-pull output. The signal transmission method must consider the interface of the inverter pg card, so choose the appropriate pg card model Or the setting is reasonable.

German heidenhain encoders are generally divided into incremental type and type. They have differences: in the case of incremental German heidenhain encoders, the position is determined by the number of pulses calculated from the zero mark, while the type The position of the German heidenhain encoder is determined by the reading of the output code. In one circle, the reading of the output code of each position is yes; therefore, when the power is disconnected, the Heidenhain encoder is not separated from the actual position. If the power is turned on again, the position reading is still current and valid; unlike the incremental German heidenhain encoder, the zero mark must be searched for.

The German heidenhain encoder manufacturers have a complete series, and they are generally dedicated, such as elevator-specific German heidenhain encoders, machine tool-specific German heidenhain encoders, and servo motor-specific German heidenhain encoders The encoders, etc., and the German heidenhain encoders are all intelligent, with various parallel interfaces to communicate with other devices.

The German heidenhain encoder is a device that converts angular displacement or linear displacement into electrical signals. The former becomes a code wheel and the latter is called a yardstick. According to the reading method, the German heidenhain encoder can be divided into two types: contact type and non-contact type. The contact type uses an electric brush to output. A brush touches the conductive area or the insulating area to indicate whether the status of the code is "1" or "0"; the non-contact type receiving sensitive element is a photosensitive element or a magnetic sensitive element. The light-transmitting area and the opaque area indicate whether the state of the code is "1" or "0".

According to the working principle, the German heidenhain encoder can be divided into two types: incremental and type.

The incremental German heidenhain encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and the number of pulses represents the magnitude of the displacement. Each position of the German heidenhain encoder corresponds to a certain digital code, so its indication is only related to the start and end positions of the measurement, and has nothing to do with the intermediate process of the measurement.

The rotary incremental German heidenhain encoder outputs pulses when it rotates, and its position is known by the counting device. When the German heidenhain encoder does not move or the power is cut off, it relies on the internal memory of the counting device to remember the position. In this way, after a power failure, the German heidenhain encoder cannot move. When the call is working, the German heidenhain encoder cannot lose the pulse due to interference during the output pulse, otherwise, the zero point of the counting device will be lost. Will shift, and the amount of this shift is impossible to know, only after the wrong production results appear. The solution is to increase the reference point. Every time the German heidenhain encoder passes the reference point, the reference position is corrected into the memory position of the counting device. Before the reference point, the accuracy of the position cannot be guaranteed. For this reason, in industrial control, there are methods such as first finding the reference point for each operation, turning on the machine and making change. Such a German heidenhain encoder is determined by the mechanical position of the code disc, and it is not affected by power outages and interference.

The performance of each position determined by the mechanical position of the German heidenhain encoder does not need to be memorized, do not need to find a reference point, and does not need to be counted all the time. When you need to know the position, when to read its position. In this way, the anti-interference characteristics and data reliability of the German heidenhain encoder has been greatly improved.

Since the German heidenhain encoder is significantly better than the incremental German heidenhain encoder in positioning, it has been increasingly used in industrial control positioning. The German heidenhain encoder has a large number of output digits due to its high precision. If parallel output is still used, each output signal must be well connected. For more complex working conditions, it must be isolated and the number of connecting cables is large , This brings a lot of inconvenience and reduces the reliability. Therefore, the German heidenhain encoder is in the multi-digit output type, and generally selects the serial output or the bus type output. The German heidenhain encoder serial The output commonly used is SSI (synchronous serial output). Multi-turn German heidenhain encoder. The German heidenhain encoder manufacturer uses the principle of clock gear machinery. When the center code disc rotates, another set of code discs (or multiple sets of gears, multiple sets of code discs) are driven by gears, and then on the basis of single-turn encoding Increase the number of turns to expand the measurement range of the German heidenhain encoder. Such a German heidenhain encoder is called a multi-turn German heidenhain encoder. It is also determined by the mechanical position of the encoder. The position code is not repeated and does not need to be memorized. Another advantage of multi-turn German heidenhain encoder is that due to the large measuring range, the actual use is often richer, so it is unnecessary to find the change point during installation, and a certain intermediate position can be used as the starting point, which is greatly simplified Difficulty in installation and debugging. The multi-turn German heidenhain encoder has obvious advantages in length positioning and has been increasingly used in industrial control positioning.