Matters needing attention of Eltra absolute encoder

Matters needing attention of Eltra absolute encoder

Precautions for using absolute encoder:

Problem 1: Encoder power supply capacity is small

Insufficient power supply capacity will cause the following situations: the movement of the melt will change the display of the mold-closing electronic ruler, and there will be fluctuations, or the movement of the mold will cause the display of the glue-shooting electronic ruler to fluctuate, resulting in larger measurement errors. This situation is more likely to occur if the solenoid valve drive power supply is shared with the absolute encoder power supply.

Problem 2: FM interference and electrostatic interference

Both FM interference and electrostatic interference may make the digital display of the absolute encoder jump. Therefore, the signal line of the electronic ruler must be separated from the strong current line of the equipment. The electronic ruler must be grounded forcibly. 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, just use a power cord to short-circuit the cover screw of the electronic ruler with some metal on the machine. As long as the short-circuit is connected, the electrostatic interference will be eliminated immediately . But if you want to eliminate high-frequency interference, it is difficult to use the above method. You can try to pause the high-frequency interference source to see if the display result is better, so as to judge whether it is a high-frequency interference problem.

Question three, the display data is beating regularly, or there is no display data

In this case, it is necessary to check whether the insulation of the connecting wire is damaged, and it is in regular contact with the casing of the machine to cause a short circuit to the ground. Question 4: What are the requirements for the neutrality, parallelism and angle of the encoder The alignment of the absolute encoder 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. However, if the parallelism error and the angle error are both too large, then the display numbers will jump. When this happens, the parallelism and angle must be adjusted.

Problem five, encoder wiring error

The three wires of the absolute encoder cannot be connected wrongly, and the power wire and output wire 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.

The absolute value encoder needs to pay attention to maintaining the stability of the supply voltage. If it is not a stable voltage, it will cause the displayed trap to fluctuate and thus lead to measurement errors. It should be noted that to prevent electrostatic interference. Electrostatic interference and FM interference can easily make the digital display of the electronic ruler jump. Separate the strong current line of the equipment from the signal line of the electronic ruler in a wire duct. The electronic ruler should use a mandatory grounding bracket, and the electronic ruler shell can measure the resistance between the end cover screw and the bracket. The resistance should be less than 1 and the resistance should be well grounded. The signal wire should be shielded, and the shielding wire should be grounded at one end of the electrical box . In the case of electrostatic interference, the voltage measurement of the general multimeter is very normal, but it shows the digital beating; the phenomenon is the same when the high frequency device is interfered. To verify whether it is electrostatic interference, use a power cord to short-circuit the cover screw of the electronic ruler with a certain point of metal on the machine. As long as a short-circuit, the electrostatic interference will be eliminated immediately. However, it is difficult to eliminate high-frequency interference by the above-mentioned methods, and high-frequency interference occurs frequently in robots and inverters, which can be verified by stopping the robot or variable frequency power saver. When the wiring is correct, the power supply capacity must be sufficient. If the power supply capacity is too small, the following situations are likely to occur: the mold clamping movement will cause the display of the glue injection ruler, or the melt movement will cause the display of the mold clamping electronic ruler to fluctuate. Especially when the solenoid valve drive power supply is combined with the power supply of the electronic ruler, the above situation is prone to occur. In severe cases, the voltage fluctuation can be measured with the voltage file of a multimeter. If the problem cannot be solved even if the electrostatic interference and high-frequency interference are eliminated and the neutrality is not good, it can also be suspected that the power of the power supply is too low. The principle of the absolute encoder is to convert the linear mechanical displacement into an electrical signal for people to read directly. Usually the variable resistance slide is fixed on the fixed part of the encoder, and the difference is measured by the displacement of the slide on the slide. The resistance value. The encoder slide rail is connected to a steady-state DC voltage, allowing a small current of microamperes to flow, and the voltage between the slide and the start is proportional to the length of the slide. Using the encoder as a voltage divider can minimize the requirements for the accuracy of the total resistance of the slide rail, because the resistance change caused by the temperature change will not affect the measurement result. Absolute encoders are a very typical type of displacement encoders, which integrate many characteristics of displacement encoders, so that absolute encoders are also a popular category in displacement encoders.