Linear displacement sensor working principle and fault handling method - Database & Sql Blog Articles

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The linear displacement sensor works on the same principle as a sliding rheostat. It is used as a voltage divider to present the actual position of the measured position with a relative output voltage. There are several requirements for the operation of this device:

First, if the electronic ruler has been used for a long time, and the seal has been aging, and there are many impurities, and the water mixture and oil will seriously affect the contact resistance of the brush, so that the displayed number will continue to jump. At this time, it can be said that the electronic scale of the linear displacement sensor has been damaged and needs to be replaced.

Second, if the capacity of the power supply is small, there will be many situations, so the power supply needs to have sufficient capacity. Then, if the capacity is insufficient, it will cause the following situation: the movement of the glue will change the display of the clamped electronic ruler, and there will be fluctuations, or the movement of the mold will cause the display of the electronic ruler to fluctuate, resulting in a large error in the measurement result. If the driving power of the solenoid valve is at the same time when the power supply of the electronic scale is together, the above situation is more likely to occur. When the situation is serious, the voltage fluctuation of the multimeter can even measure the fluctuation of the voltage. If the situation is not caused by high frequency interference, static interference or neutral neutrality, then it may be caused by the power of the power supply being too small.

Third, FM interference and static interference are all possible to make the digital display of the linear displacement sensor jump. The signal line of the electronic ruler and the strong electric line of the device are separated from the wire slot. The electronic ruler must use the grounding bracket forcibly, and at the same time let the outer casing of the electronic ruler be in good contact with the ground. A shielded wire is required for the signal line, and a section of the electrical box should be grounded to the shielded wire. If there is high frequency interference, the voltage measurement using the multimeter will usually display normal, but the display number will be non-stop; when static interference occurs, the situation will be the same as high frequency interference. To prove whether it is static interference, you can use a power cord to short the cover screw of the electronic ruler with some metal on the machine. As soon as it is shorted, the static interference will be eliminated immediately. of. However, if it is necessary to eliminate high-frequency interference, it is difficult to use the above method. Frequency conversion power savers and robots often have high-frequency interference, so you can try to verify whether it is high by stopping the high-frequency power saver or robot. Frequency interference.

4. If the electronic scale of the linear displacement sensor is in the process of working, the display data at a certain point is beating regularly, or when the data is not displayed, it is necessary to check whether the insulation of the connecting wire is damaged or not. And short circuit to ground caused by regular contact with the outer casing of the machine.

5. The voltage of the power supply must be stable. The voltage of the industry needs to meet the stability of ±0.1 [%]. For example, if the reference voltage is 10V, the fluctuation of ±0.01V can be allowed. If not, it will cause display. The traps fluctuate like this. However, if the amplitude of the display fluctuation at this time does not exceed the fluctuation of the fluctuating voltage, then the electronic ruler is normal.

Sixth, the alignment of the linear displacement sensor needs to be very good, but the parallelism can allow an error of ±0.5mm, and the angle can allow an error of ±12°. However, if the parallelism error and the angle error are both too large, there will be a case where the digital jitter is displayed. Then, when such a situation occurs, the parallelism and angle must be adjusted.

Seventh, in the process of connection, we must pay more attention, the three lines of the electronic ruler can not be connected wrong, the power line and output line can not be exchanged. If the above line is wrong, there will be a large linearity error. It is difficult to control, the accuracy of the control will be poor, and the display will be prone to jitter.