What are the problems encountered when using the photoelectric encoder

1. The displacement or loosening of the photoelectric encoder due to mechanical interface and other reasons, which leads to the phenomenon that the encoder cannot receive the optical signal reliably or the count value is lost. For example: the photoelectric encoder is used in the lifting system, because the photoelectric encoder is directly bolted to the drive shaft of the hoist main shaft, and the middle is the elastic shaft coupling. If the position is too offset during installation, the elastic coupling will tilt Excessively, the elastic effect is lost. When the load carried by the motor vibrates, this vibration speed will damage the internal function of the photoelectric encoder, cause false pulses, and cause the control system to be unstable or malfunction. In addition, because the encoder is constantly rotating, when the elastic coupling is not tightly fixed, it will loosen, causing sudden loss of pulses during the counting process. If the loss is serious, the wrong value will be calculated, causing The depth indication is incorrect, or the speed fault is falsely reported.

　　 2. Various electromagnetic interference sources at the production site interfere with the photoelectric detection device, which causes the pulse output waveform of the photoelectric encoder to be distorted and makes the system miscount. For example: the photoelectric detection device is installed in the main body of the production equipment, and the signal is transmitted through the cable to the control PLC. The distance is generally 20-100m. Although the transmission cable is generally multi-core shielded cable, it is affected by the wire resistance and the capacitance between the cables. In addition, when laying together with other cables, it is extremely susceptible to various electromagnetic interferences, which causes distortion of the pulse waveform, which results in deviations in the counting signal and a decrease in system accuracy.

　　 3. As the photoelectric detection device is installed at the production site, the photoelectric detection device cannot work reliably due to the environmental factors of the production site. For example, the encoder for anti-skid protection installed on the hoist's sky wheel, due to the bad environment, high temperature in summer, low temperature in winter, and high humidity in rainy days, etc., the characteristics of the electronic components inside the photoelectric detection device change or Damaged and signaled by mistake.