Rotary encoder safety issues
2023-12-27
In the information technology era, security products have attracted more and more attention. In network monitoring systems, encoders are the bridge between monitoring storage and transmission. Rotary Encoder is a common Encoder, commonly used in monitoring video transmission equipment, speed measuring generators and other security products, used to measure the speed and with the PWM technology can achieve fast speed device, photoelectric rotary encoder through photoelectric conversion The output shaft angular displacement, angular velocity and other mechanical quantities can be converted into corresponding electrical pulses for digital output (REP). Rotary encoders are divided into single output and dual output. The technical parameters mainly include the number of pulses per revolution (tens to several thousand), and the supply voltage. Single output means that the output of the rotary encoder is a set of pulses, while the dual-output rotary encoder outputs two sets of pulses with 90-degree phase difference between A and B. Through these two sets of pulses, not only the rotation speed but also the rotation can be determined. The direction. Rotary encoder installation techniques are also very particular about, such as improper operation is likely to lay hidden security risks, the following we understand the installation of rotary encoder related issues. Do not apply direct impact to the shaft during installation
The connection of the encoder shaft to the machine should use a flexible connector. When installing the connector on the shaft, do not press hard. Even if the connector is used, special attention must be paid to the fact that the shaft may be loaded with a larger load than the allowable load due to poor installation, or the core removal phenomenon may occur. The bearing life depends on the conditions of use and is particularly affected by the bearing load. If the bearing load is smaller than the specified load, the bearing life can be greatly extended. Do not disassemble the rotary encoder. Doing so will impair oil and drip resistance. Anti-drip products should not be immersed in water or oil for a long time, and should be wiped clean when there is water or oil on the surface. Vibration can cause false impulses
The vibration added to the rotary encoder is often the cause of false pulses. Therefore, pay attention to the installation site and installation site. The greater the number of pulses per revolution, the narrower the slot spacing of the rotating slot disc, the more susceptible to vibration. When rotating or stopping at a low speed, the vibration applied to the shaft or the body shakes the rotating groove disc and false pulses may occur. Wiring connection pay full attention to
Incorrect wiring may damage the internal circuit, it should give full attention to the wiring: 1. The wiring should be performed with the power OFF. When the power is turned on, if the output line contacts the power supply, the output circuit may be damaged. 2. If the wiring is incorrect, the internal circuit may be damaged, so pay attention to the polarity of the power supply when wiring. 3. If the wiring is conducted in parallel with the high-voltage line or the power line, it may be induced to malfunction and be damaged. Therefore, separate the wiring. 4. When extending the wire, it should be less than 10m. Moreover, due to the distribution capacity of the electric wire, the rise and fall time of the waveform will be longer. When there is a problem, the waveform is shaped using a Schmidt circuit or the like. 5. To avoid induced noise, etc., try to use the shortest distance wiring. When inputting to an integrated circuit, special attention needs to be paid. 6. When the wire is extended, the rise and fall times of the waveform are prolonged due to the influence of the conductor resistance and the line capacitance, and interference (crosstalk) between the signals is likely to occur. Therefore, a wire with a small resistance and low capacitance between the wires (twisted pair) is used. Shielded wire). For HTL encoders with a symmetrical negative signal output, the signal transmission distance can reach 300 meters.
