The role and working principle of the P+F encoder

The operation principle and infection of the P+F encoder: It is a modified sensor that converts the change displacement into a series of digital pulse signals, which can be used to control the angular displacement, and can also be used to measure the linear displacement if the P+F encoder is connected to a gear bar or spiral lead screw.

The role and working principle of the P+F encoder

The role and working principle of the P+F encoder

After the electrical signal is generated, the P+F encoder is handled by the digital control CNC, the programmable logic controller PLC, and the control system. These sensors do not have to be used: machine tools, material processing, electric motor reaction systems, and measuring and manipulation equipment. In the ELTRA P+F encoder, the optical scanning principle is used for the conversion of angular displacement. The reading system is based on a modification of the radial indexing dial, which consists of a replacement translucent and opaque window. The system is all illuminated vertically by an infrared light source, which projects the image on the plate onto a plaster, which is covered with a grating called a collimator, which has a window identical to that of a disc. The job of the Sticker is to feel the optical changes that occur when the infected disc moves, and then convert the light changes into corresponding electrical changes. In general, a speed signal can be obtained by changing the P+F encoder, which is reflected to the inverter and then the output data of the inverter is conditioned. Defect phenomenon: 1. When the P+F encoder is bad (no output), the inverter is not as good as the general operation, and the working speed becomes very slow, and the inverter will display "PG disconnected" for a while... Combined with the action to cause infection. In order for the electrical signal to rise to a higher level and to generate a square wave pulse without any interference, it is necessary to dispose of it with electronic electricity. The adjacent preparation between the P+F encoder pg wiring and the parameter vector inverter and the P+F encoder pg must correspond to the type of P+F encoder pg. Generally speaking, the P+F encoder pg type is divided into three types: differential output, collector open output and push-pull output, and the signal transmission must take into account the interface of the inverter pg card, so the appropriate type of pg card or reasonable setting is selected.

P+F encoders are generally divided into incremental and definite types, and they have the biggest difference: in the case of incremental P+F encoders, the number of pulses counted from the zero mark is recognized, while the P+F encoder is recognized by the reading of the output code. In a circle, the reading of each output code is unique; Therefore, when the power supply is disconnected, the P+F encoder does not break up with practice. If the power is turned on again, then the reading is still time-sensitive and invalid; Unlike the incremental P+F encoder, it is necessary to look for the zero marker.

At this moment, the series produced by the manufacturers of P+F encoders are very complete, and they are generally shared, such as elevator P+F encoders, machine tools P+F encoders, servo motors P+F encoders, etc., and P+F encoders are intelligent, with all kinds of parallel interfaces to communicate with other equipment.

The P+F encoder is a device that converts angular or linear displacement into an electrical signal. The former becomes the yardstick, and the latter is called the yardstick. According to the readout program, the P+F encoder can be divided into two types: touch type and non-touch type. The touch type selects the brush output, and a brush touches the conductive area or the insulating area to imply that the shape of the code is "1" or "0"; The non-touch receiving element is a photosensitive element or a magnetic element, and the light transmission area and opaque area are used to imply that the shape of the code is "1" or "0" when selecting the photosensitive element.

According to the operating principle, the P+F encoder can be divided into two categories: incremental and certain. The incremental P+F encoder converts the displacement into a periodic electrical signal, and then changes this electrical signal into a counting pulse, and uses the number of pulses to indicate the size of the displacement. Each of the P+F encoders corresponds to an acknowledged digital code, so its indication is only related to the start and end of the measurement, and not to the two processes of the measurement.

The incremental P+F encoder is modified to output pulses when it moves, and it is known by the counting device, and when the P+F encoder does not move or the power goes out, it is remembered by the internal recall of the counting device. How, when the power failure, the P+F encoder does not have any movement, when the call is working, the P+F encoder output pulse process, but also does not have to disturb and lose the pulse, otherwise, the zero point recalled by the counting equipment will be offset, and the amount of this offset is impossible to know, only after the production effect of the fault appears. The way to deal with this is to add reference points, and the P+F encoder will refer to the recall of the batch improvement counting device every time the reference point is finished. In the past, the reference point was beyond the precision of the point. For this reason, in the industrial control, there are ways to find the reference point first for each operation, and to make change at start-up. The P+F encoder is mechanically selected by the disc and is not affected by power outages or disturbances.

The uniqueness of each of the P+F encoders is mechanically determined, it does not need to recall, it does not need to look for reference points, and it does not have to be constantly counted, when the need is known, when to read it. In a big way, the anti-interference characteristics and data reliability of the P+F encoder have been greatly improved.

Because the P+F encoder is better than the incremental P+F encoder in terms of positioning, it has been used more and more in industrial positioning. Because of its high precision, the number of output bits is more, if the parallel output is still used, each of its output signals must be guaranteed to be adjacent to the very good, for more complex working conditions to isolate, adjacent to the number of cable cores, which brings a lot of inconvenience and reduce reliability, therefore, the P+F encoder in the multi-digit output type, generally choose serial output or bus output, the production of the P+F encoder serial output is most commonly used is SSI (synchronous serial output).

Multiturn P+F encoders. P+F encoder manufacturers use the principle of wall clock gear machinery, when the core code disc is changed, through the gear drive another group of code discs (or multiple sets of gears, multiple sets of code discs), and then add the number of turns of the code on the basis of the single-turn code, in order to expand the measurement scope of the P+F encoder, how sure the P+F encoder is called the multi-turn type P+F encoder, it is also recognized by the mechanical code, each code is unique and not repeated, without recalling. Another advantage of the multi-turn P+F encoder is that due to the large measurement range, the practical use is often more sufficient, how the equipment does not need to struggle to find the change point, one or two ends can be used as the starting point, and the difficulty of equipment debugging is greatly simplified. The multi-turn type P+F encoder has the disadvantages of length positioning, and has been increasingly used in industrial control positioning in the past.

The role and working principle of the P+F encoder

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