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Encoder Failure Analysis and Encoder Replacement

2022-09-21

Encoder Failure Analysis Absolute encoder battery voltage drop: this failure usually have meaning clear alarm, this time need to replace the battery, if the reference point position memory is lost, but also to perform the revert to the reference point operation control. Encoder installation installed after the reduction gear, such as the shaft end of the winch wire rope reel or the last section of the reduction gear shaft end, this method has no gear back and forth clearance, the measurement is more direct, higher precision, this method is generally measured in long-distance positioning, such as a variety of lifting equipment, feeding trolley positioning, and so on. Failure of the encoder connection cable: this failure has the highest probability of occurrence, maintenance and repair often encountered, should be a priority factor. Usually for the encoder cable break, short circuit or poor contact (line loose), then need to replace the cable or connector. Should also pay special attention to whether it is due to the cable is not fixed tightly, resulting in loose caused by open welding or broken circuit, then need to tighten the cable. Encoder +5V power drop: is the +5V power supply is too low...

How to determine if an encoder is counting accurately

2022-09-21

In many cases, the encoder is not broken, but the interference causes a bad waveform, which leads to (generates, contributes to) inaccurate counting. How can I determine this? Encoder is a precision component, this is mainly because of the encoder around the interference is more serious, such as: whether there is a large motor, welding machine frequent start-up caused by interference, and whether the power line and the same pipeline transmission and so on. Select what kind of output on the anti-jamming is also very important, the general output with reverse signal anti-jamming to be better, i.e., A + ~ A-, B + ~ B-, Z + ~ Z-, which is characterized by the addition of the power supply (to the electronic equipment to provide power to the device) 8 wires, rather than 5 wires. Examples include various lifting devices, feeder trolley positioning, etc. With the reverse signal in the cable (Cable) transmission is symmetrical, interference is small, in the receiving device can also be added to the judgment. It is the encoder is also good or bad, its code disk \ electronic chip (also known as microcircuit) \ within...

How to Emergency Zeroing and Alignment of Encoders, with Methods

2022-09-21

The emergency zeroing method is simple and practical. However, the motor must be removed from the device and relied on to perform the commissioning. After the trial and then put back into the equipment again can be. In fact, after a large number of zeroing tests, each has an angle of less than 10 degrees of zero-speed static area, and 350 degrees of high-speed reversal area, if you are occasionally replacing an encoder, this is really too much trouble, here is a very simple emergency method can also be quickly fixed. Remove the damaged encoder, install a new encoder, and fixed to the shaft. And so that the adjustable base is suspended and can be freely rotated, the motor is reconnected to the circuit, the speed of the machine to zero, power on normal after pressing the start switch there are several things will happen. 1, is the motor high-speed reversal, this is due to the encoder and the actual zero position is too large a difference caused by, do not panic, you can turn the encoder through an angle until the motor can be stationary down. 2, is the motor at zero speed command in a stationary state (sta...

Influence of the optical, mechanical and electrical parts of the encoder on accuracy

2022-09-21

First, the encoder optical part of the impact on the accuracy of 1, the optical code plate: the main thing is the motherboard accuracy, the number of engraved lines per revolution, engraved line accuracy, engraved line width consistency, edge refinement and so on. 2、Optical emission source: light parallelism and consistency, light attenuation. 3、Light receiving unit: reading angle, reading response. Drawstring displacement sensor fully combines the advantages of the angle sensor and linear displacement sensor, become a small installation size, compact structure, measuring stroke, high precision sensor, stroke from a few hundred millimeters to more than ten meters. 4, the optical system after use: pollution, attenuation. Second, the mechanical part of the encoder on the accuracy of the impact 1, the shaft processing accuracy and installation accuracy. 2, bearing accuracy and structural accuracy. Binary encoder is a pre-specified method of text, numbers or other objects coded into binary digital, or information, data into a prescribed binary electrical pulse signal. 3, code disk mounted...

Why Absolute Encoders? With a description of the advantages

2022-09-19

Why absolute encoders? What are the advantages? Take a look below! 1, the absolute position is not lost characteristics: absolute encoder as a position confirmation tool with absolute position is not lost, can ensure that in the system if the power supply failure or in the case of power failure in the system also occurs in the case of movement, the true position value of the system will not be lost. Absolute encoder code value" with the measured "position" corresponds to the only, with "power failure memory" function, no rotary measurement of the accumulated error, in "a cycle of "It is superior to incremental encoders in the field of measurement and control, and the range can be adjusted by adding a front reduction gearbox. In the application without continuous reading position, absolute encoder is particularly suitable, such as satellite tracking antenna, only need to check the position at intervals is enough. 2, flexible programmable features: absolute encoders do not require system zeroing, can be based on point-to-point position reference, the establishment of the position programming, rather than based on...

Incremental encoder electronic commutation signal alignment method introduction

2022-09-19

The incremental encoder with transponder signal UVW electronic transponder signal phase and rotor magnetic pole phase, or said electrical angle between the phase alignment method is as follows: 1, with a DC power supply to the motor's UV winding less than the rated current DC, U in, V out, the motor shaft directed to a balanced position; 2, with an oscilloscope to observe the encoder's U believe the number of signals and Z signals; 3, according to the operation and control of the According to the convenience of operation and control, adjust the relative position of the encoder shaft and the motor shaft, or the relative position of the encoder shell and the motor shell; 4, one side of the adjustment, while observing the encoder U believe the signal jump along, and the Z signal, until the Z signal is stable (Explanation: solid and stable; there is no change) in the high level, locking the encoder and the motor of the relative position of the relationship; 5, back and forth to twist the motor shaft, after the spreading of the hand, if the motor axis each time free return to the equilibrium position, the Z signal can be stabilized on the high level, then the alignment is valid. Remove the DC...

Line, bit and resolution concepts of incremental encoders

2022-09-19

Incremental encoder line, bit, the concept of resolution I. Incremental encoder line Encoder disk of the week engraved line, incremental disk engraved line can be 10 lines, 100 lines, 2500 lines of engraved lines, as long as the disk can be engraved, you can choose the number of; Absolute value of the disk of the disk engraved line due to the Gray code arrangement of the way the method, decided to decide that it is basically a power of 2 lines, such as 256 lines, 1024 lines, 8192 lines, etc. SSI signal conversion monitor through the coupling and other coupling parts of the encoder shaft and the measured shaft synchronous rotation. SSI signal conversion monitor through the coupling and other coupling parts will be the encoder shaft and the drum shaft or pinion shaft coupling, so that the encoder and the measured shaft synchronous rotation, the measured shaft rotation into the encoder shaft rotation, through the special tester to collect the encoder value so as to accurately measure the displacement of the measured parts. And achieve the purpose of real-time measurement and control of the displacement of the measured parts. It is suitable for measuring the lifting height of all kinds of windlasses and screw closure gates. But the absolute value code disk also has special Gray residual code output, such as...

Basic waveform and circuit analysis of incremental encoders

2022-09-19

Basic waveform and circuit analysis of incremental encoders Incremental encoders are sensors that output in the form of pulses. The outer and middle channels of the code disk of an absolute encoder have the same number of uniformly distributed light-transmissive and light-impermeable sectors, but the two sectors are staggered by half a sector from each other. When the code disk rotates, its output signals are the phase A and B pulse signals with a phase difference of 90° and the pulse signal generated by the third code channel with only one light-transparent slit. From the phase relationship between the A, B two output signals can be judged from the direction of rotation (direction). When the code disk is rotating positively, the pulse waveform of channel A is π/2 ahead of channel B, and when it is rotating negatively, the pulse of channel A lags π/2 behind channel B. The actual circuit is to use the positive pulse generated by triggering the monostable at the lower edge of the plastic waveform of channel A to phase with the plastic waveform of channel B. When the code disk is rotating positively, only the forward pulse of the mouth is output, and vice versa, only the reverse pulse of the mouth is output. The binary encoder is based on the input...

Incremental Encoder Resolution, Multiplication and Subdivision Technology

2022-09-19

Incremental encoder resolution, frequency multiplication and subdivision technology Incremental encoder code disk is composed of a very large number of grating engraved lines, there are two photoeyes to read the A, B signal, the density of the engraved lines determines the resolution of this incremental encoder, that is, the smallest change in the angle of the value of the disc can be read. The parameter that represents the resolution of an incremental encoder is PPR, which is the number of pulses per revolution. Incremental encoder A/B output waveforms generally have two kinds, one is a steeply rising edge and steeply falling edge of the square wave signal, a slow rise and fall, waveforms similar to sinusoidal Sin/Cos curve waveform signal output, A and B difference of 1/4 T period 90 degrees phase, if A is a class of sinusoidal Sin curve, then B is a class of cosine Cos curve. For square wave signals, A,B two phases differ by 90 degrees phase, so that at 0 degrees phase angle, 90 degrees, 180 degrees, 270 degrees phase angle, these four positions have rising and falling edges,...

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