What is the working environment of the linear displacement sensor?
The working principle of the linear displacement sensor is the same as that of the sliding rheostat. It is used as a voltage divider, and it presents the actual position of the measured position with relative output voltage. There are several requirements for the work of this device:
1. If the electronic ruler has been used for a long time, and the seal has been aging, there are a lot of impurities mixed in, and the water mixture and oil will seriously affect the contact resistance of the brush, which will make the displayed number jump continuously. At this time, it can be said that the electronic ruler of the linear displacement sensor has been damaged and needs to be replaced.
2. If the capacity of the power supply is very small, many situations will occur. Therefore, the power supply must have sufficient capacity. Then, insufficient capacity will cause the following situation: the movement of the melt will cause the display of the mold-closing electronic ruler to change and fluctuate, or the movement of the mold will cause the display of the glue-shooting electronic ruler to fluctuate, resulting in large errors in the measurement results. If the driving power of the solenoid valve and the power supply of the linear displacement sensor are at the same time, the above situation is more likely to occur. When the situation is serious, the voltage range of the multimeter can even measure the relevant fluctuation of the voltage. If the situation is not caused by high-frequency interference, electrostatic interference, or insufficient neutrality, it may be caused by the power of the power supply being too small.
3. FM interference and electrostatic interference may cause the digital display of the linear displacement sensor to jump. The signal line of the electronic ruler and the strong current line of the equipment should be separated from the wire duct. The electronic ruler must compulsorily use the grounding support, and at the same time, make the shell of the electronic ruler make good contact with the ground. The signal wire needs to use a shielded wire, and a section of the electrical box should be grounded to the shielded wire. If there is high-frequency interference, the voltage measurement using a multimeter will usually display normal, but the displayed number will be pulsating; and when there is electrostatic interference, the situation is the same as that of high-frequency interference. To prove whether it is electrostatic interference, you can use a power cord to short-circuit the cover screw of the electronic ruler with some metal on the machine. As long as it is short-circuited, the electrostatic interference will be eliminated immediately of. But if you want 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 stop the high-frequency power saver or the robot to verify whether it is high. Frequency interference.
4. If the electronic ruler of the linear displacement sensor is in the process of working, the display data at a certain point is regularly beating, or when there is no display data, it is necessary to check whether the connection line insulation is damaged. , And a short-circuit to ground caused by regular contact with the casing of the machine.
5. The power supply voltage must be stable. The industrial voltage needs to meet the stability of ±0.1[%]. For example, if the reference voltage is 10V, a fluctuation of ±0.01V can be allowed. If it is not, it will cause display The trap fluctuates in such situations. But if the amplitude of the display fluctuation at this time does not exceed the amplitude of the fluctuation voltage, then the electronic ruler is normal.
6. The alignment of the linear displacement sensor needs to be very good, but the parallelism can be allowed to have an error of ±0.5mm, and the angle can be allowed to have an error of ±?. However, if the parallelism error and the angle error are both too large, the display numbers will be bounced. When this happens, the parallelism and angle must be adjusted.
7. During the connection process, be sure to pay more attention. The three wires of the electronic ruler cannot be connected wrongly, and the power cable and output cable cannot be exchanged. If the upper line is connected incorrectly, there will be a large linear error, it will be difficult to control, the accuracy of the control will become very poor, and the display is prone to beating and so on.