What are the working principles and installation precautions of linear displacement sensors?
The working principle of the linear displacement sensor is the same as that of a sliding varistor. It is used as a voltage divider. It shows the actual position of the measured position based on the 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 is aging, and there are many impurities in it, and the water mixture and oil will seriously affect the contact resistance of the brush, this will cause the displayed number to jump continuously. 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, many situations will occur, so the power supply needs to have sufficient capacity. Then, the insufficient capacity will cause the following situations: the movement of the glue will cause the display of the clamping electronic scale to change, and there will be fluctuations, or the movement of the clamping will cause the display of the electronic scale to fluctuate, causing a large error in the measurement results. If the driving power of the solenoid valve and the power supply of the linear displacement sensor are together at the same time, the above situation is more likely to occur. When the situation is serious, the voltage fluctuation of the multimeter can even measure the relevant voltage fluctuation. If the situation is not caused by high frequency interference, static electricity interference or not good enough neutrality, then it may be caused by the power of the power supply being too small.
Third, both FM interference and electrostatic interference may make the digital display of the linear displacement sensor beating. The signal line of the electronic ruler should be separated from the strong line of the equipment. The electronic ruler must use a grounding bracket compulsorily, and at the same time, the outer surface of the electronic ruler should be in good contact with the ground. The signal wire needs to be shielded, and a section of the electrical box should be grounded to the shield. If there is high frequency interference, the voltage measurement using a multimeter usually shows normal, but the displayed number will be non-stop. When there is electrostatic interference, the situation is the same as high frequency interference. To prove whether it is electrostatic interference, you can use a power cord to short the cap screw of the electronic ruler to some metal on the machine. As long as the short is connected, the electrostatic interference will be eliminated immediately. of. However, if you want to eliminate high frequency interference, it is difficult to use the above method. High frequency interference often occurs in inverter power savers and robot hands, so you can try to stop the high frequency power saver or robot to verify whether it is high. Frequency interference.
4. If the electronic scale of the linear displacement sensor is in the process of working, the displayed data at a certain point will jump regularly, or when no data is displayed, you need to check whether the insulation of the connecting wire is damaged. , And the machine's shell is in regular contact with the ground caused by short circuit.
5. The voltage of the power supply must be stable. The industrial voltage must meet the stability of ± 0.1 [%]. For example, if the reference voltage is 10V, it can allow fluctuations of ± 0.01V. If it is not, it will cause a display The snare fluctuates like this. However, if the amplitude of the displayed fluctuation does not exceed the amplitude of the fluctuation voltage at this time, then the electronic ruler is normal.
6. 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 ± �. However, if the parallelism error and the angular error are both too large, the display of digital jitter may occur. Then when this happens, the parallelism and angle must be adjusted.
7. In the process of connection, you must pay more attention. The three wires of the electronic ruler cannot be connected wrongly, and the power line and output line cannot be exchanged. If the above lines are connected incorrectly, a large linear error will occur. It will be difficult to control, the control accuracy will become poor, and the display is prone to jumps.
If you want to know more, our website has product specifications for the sensors， you can go to ALLICDATA ELECTRONICS LIMITED to get more information