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Eight common errors of German P+F encoders

Author:QINSUN Released in:2023-04 Click:23

Eight common mistakes of German P+F encoders:

p+f is a rotary sensor that converts rotational displacement into a series of digital pulse signals.
These pulses can be used to control angular displacements, or to measure linear displacements when the encoder is combined with a rack or screw.
After the P+F encoder generates electrical signals, it is processed by 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 measuring and control equipment. The conversion of the angular displacement in the ELTRA encoder uses the photoelectric scanning principle. The reading system is based on the rotation of a radial indexing disk consisting of alternating transparent and opaque windows.

The system is all vertically illuminated with an infrared lightbron so that the light projects the image on the disc onto the surface of a receiver covered by a grating, called a collimator, that has the same window as the disc. The receiver\'s job is to sense the light changes caused by the disk\'s rotation, and then convert the light changes into corresponding electrical changes. In general, the rotary encoder can also receive a speed signal, and this signal must be fed back to the frequency converter to adjust the output data of the frequency converter. Symptoms of failure: 1. When the rotary encoder is damaged (no output), the frequency converter cannot work normally and becomes very slow. can work. In order for an electrical signal to rise to a higher level and produce a square wave pulse without any interference, it must be handled by an electronic circuit. The cabling of the encoder pg en the connection mode between the vector inverter parameter and the encoder pg must match the type of encoder pg. Generally, there are three kinds of encoder pg types: differential output, open-collector output and push-pull output. The signal transmission method should consider the interface of the inverter pg board, so choose a suitable pg card model or set it is reasonable
Encoders are generally divided into incremental type and absolute type, and they have the main difference: in the case of incremental encoders.

The position is determined by the number pulses counted from the zero mark, while the position of an absolute encoder is determined by reading the output code. In one revolution, reading the output code from any position is positive; therefore the absolute encoder is not separated from the actual position when the power is disconnected. When the power is turned back on, the position reading is still therealways current and valid; unlike incremental encoders, where the zero mark must be sought.
1. Failure of the encoder itself: It refers to the failure of the components of the encoder itself, making it unable to generate and output the correct waveform. In this case, it is necessary to replace the encoder or repair its internal components.
2. Error in the encoder connection cable: This type of error is the most likely to occur and is common during maintenance, so it should be a priority factor. Usually, the encoder cable is disconnected, shorted, or poorly connected and the cable or connector needs to be replaced. Special attention should also be paid to it. Since the cable is not firmly attached, it will loosen and cause open welding or an open circuit. At this time, the cable must be tightened.
3. Encoder +5V supply is lost: This means that the +5V supply is too low, musually not lower than 4.75 V. The power supply should be checked or the cable replaced.
4. The battery voltage of the absolute encoder drops: this kind of error usually has a clear alarm, and the battery should be replaced at this time. If the memory of the reference point is lost, the operation of returning to the reference point must be performed.
5. The shield wire of the encoder cable is not connected or falls off: this will introduce interference signals, make the waveform unstable and affect the communication accuracy. It is necessary to ensure reliable welding and grounding of the shield wire.
6. Loose installation of the encoder: This kind of malfunction affects the accuracy of the position control, causing the position deviation to be out of tolerance during stop and movement, and even generates a servo system overload alarm if once the machine is powered onswitched. Pay special attention.
7. Grating Contamination This will reduce the output amplitude of the signal and the oil should be gently wiped off with absorbent cotton soaked in absolute alcohol.
8. The high-speed end of the encoder is not centered or installed too tight: this will wear and heat the encoder ball bearing, and the lubricating oil in the bearing will leak and contaminate the code disc, which will affect signal acquisition.