Detailed use of displacement sensor

Linear displacement sensor also called electronic ruler is actually a sliding rheostat, then the linear displacement sensor should pay attention to what matters when using it? First, the electronic ruler is used as a voltage divider to display the actual position of the measured position with relative voltage. Therefore, several requirements have been put forward for this device (electronic ruler):

Can not be connected to the wrong three lines of the electronic ruler, 1#, 3# lines are power lines, 2# is the output line In addition to 1#, 3# line power lines can be exchanged, the 2# line can only be the output line. If the above line is connected wrongly, there will be a large linear error, poor control accuracy, and easy to show the phenomenon of jitter. If it is very difficult to control, you should suspect that the wrong line. The installation neutrality is better, the angle tolerance is ±12°, and the parallelism deviation is ±0.5mm, which means a certain error. If both the angle error and the parallelism error are too large, it will cause the display digital jitter. In this case, the voltage fluctuation of the multimeter can be used to measure the voltage fluctuation. Be sure to adjust the angle and parallelism. Please pay special attention: After replacing the aluminum frame of the electronic ruler with a stainless steel frame at the site, the traction mounting position of the lever should be raised by 2 Mm. Otherwise, the grounding problem is solved, and the problem of misalignment is formed. It must be solved at the same time. The power supply must have sufficient capacity. If the power supply capacity is too small, the following situations are likely to occur: Clamping movement will cause the ejected electronic ruler to show jitter, or the glue movement will cause display fluctuations of the clamped electronic ruler. In particular, when the solenoid valve driving power supply is connected together with the electronic ruler power supply power source, the above-mentioned situation is easy to occur. In severe cases, the voltage fluctuation of the multimeter can be used to measure the voltage fluctuation. If you can't solve the problem by eliminating static interference, high-frequency interference, and poor neutrality, you can also suspect that the power of the power supply is too small.

For an electronic ruler that has been used for a long time, there may be many impurities, and there are oils and water mixtures that affect the contact resistance of the brush and cause the display of digital jitter. This can be considered as early damage of the electronic ruler itself. The electronic ruler shows that the fault is easy to handle. As long as a digital multimeter and a piece of wire are available on the equipment, as long as comprehensive analysis is made, it is not difficult to judge problems and solve problems.

No external interference, including static and high frequency interference. Therefore, the strong line of the device and the signal line of the electronic ruler should be separated from the slot. The electronic ruler should use a forced grounding bracket, and make the electronic ruler shell (the resistance between the end cap screw and the bracket can be less than 1Ω resistance) be well grounded. The signal line should be shielded and should be applied at one end of the electrical box. Connect the shield to ground or connect to the negative of the DC power supply. When the static electricity is disturbed, the voltage measurement of the general multimeter is very normal, but it is the display digital beat; The phenomenon is the same when high-frequency interference. The verification is not electrostatic interference. Use a power cable to short-circuit the cover screw of the electronic ruler to a certain point on the machine. If only a short connection is made, the electrostatic interference will be eliminated immediately. However, it is difficult to eliminate high-frequency interference by the above methods, and high-frequency interference occurs in many robots and frequency conversion power savers, which can be verified by stopping the robot or frequency conversion.

The supply voltage should be stable, and the industrial power supply requires a stability of ±0.1%, for example, a reference voltage of 10V, allowing a fluctuation of ±0.01V. Otherwise, it will cause large fluctuations in the display. If the display fluctuations at this time do not exceed the fluctuation amplitude of the fluctuation voltage, the electronic ruler is normal.