I. Mechanical Installation of Linear Displacement Sensor
1. When installing a linear displacement sensor, the remaining space should be evenly distributed at both ends. Do not tighten the fixing bracket screws before determining the limit position. The fixing bracket screws of the linear displacement sensor can be tightened only after the stroke is adjusted.
2. The ball joint of the pull rod type displacement sensor allows a centering deviation of 1mm radius. Of course, the shorter the specification, the smaller the centering deviation is recommended.
3. After fixing the linear displacement sensor, when the pull rod is retracted, the cylindrical body of the universal joint should have clearance in all four radial directions. Otherwise, adjust the universal joint mounting position or the mounting bracket position near the extended end.
4. If there is significant misalignment when the lever is pulled out, the mounting bracket near the plug should be adjusted. This can be used as an auxiliary check method.
5. The allowable angle between the ball joint mounting rod and the pull rod is 12 degrees. However, if both the centering deviation and tilt deviation are large during installation, it will affect the stability and service life of the electronic ruler. Further adjustments should be made.
6. The slider electronic ruler can reduce the workload of adjusting the centering, but the auxiliary extension rod cannot be removed. Otherwise, poor centering will lead to instability and reduced service life, or even cause the electronic ruler to fail immediately.
7. After all adjustments are complete, tighten the mounting screws, ensuring the grounding resistance is less than 1 ohm. Use a multimeter set to the 200 ohm range to measure the resistance between the electronic ruler cover screws and the mounting bracket.
8. When using four-wire or shielded wiring, the grounding terminal at the electronic ruler end should be connected, and the fourth terminal or shielded wire should be reliably grounded at the electrical control box end.
II. Operating Conditions of Linear Displacement Sensors
1. Ensure the stability of the operating power supply.
The operating power supply requires ±0.1% stability; otherwise, it will cause fluctuations in the display display. The fluctuation range of the display display must be guaranteed not to exceed the voltage fluctuation range.
2. Preventing interference from static electricity
1) The signal lines of the displacement sensor are shielded and routed in separate cable trays from the power lines;
2) The displacement sensor is installed on a grounded bracket to ensure that the outer casing of the electronic ruler is well grounded. The signal line is grounded at one end of the power supply box. To verify whether there is electrostatic interference, a piece of power cord can be used to short-circuit the screw of the electronic ruler cover to a metal point on the machine. The electrostatic interference will be eliminated immediately.
3) Requirements for the capacity of the working power supply
If the power supply capacity is too small, the following phenomena will occur:
The mold closing motion can cause fluctuations in the electronic ruler display during injection, or the molten plastic movement can cause fluctuations in the display during mold closing. This is especially true when the solenoid valve's drive power supply is connected to the electronic ruler's operating power supply. In severe cases, voltage fluctuations can be detected by using a multimeter's voltage setting.
3. Wiring of the linear displacement sensor
Terminal "1" and "3" are power lines, and "2" is the output line. Connecting the wrong wires will result in a large error.
4. Installation
The installation angle error must not exceed 12°, and the parallelism must not exceed 0.5mm.
5. Prevent short circuits
If the linear displacement sensor's electronic ruler displays a fixed fluctuation at a certain point, or fails to display any data, the connecting wires should be checked for damage, lack of insulation, or short circuits.
6. Prevent aging
Linear displacement sensor electronic rulers operate in harsh environments for extended periods, which can lead to aging, affecting the contact resistance of the brushes and causing fluctuations in the displayed data.
III. Application Areas of Linear Displacement Sensors
General application areas:
1. KTC, KTM, and LS tie rod structures are general-purpose structures. When used with optional ball joints or spherical joints, they can reduce the adverse effects caused by misalignment during installation. They are suitable for injection molding machines, textile machinery, woodworking machinery, etc.
2. KPC and KPM models are fixed at both ends with hinged hinges for motion control. They are suitable for measurement systems where the sensor body cannot be fixed, and the sensor will move with the measurement motion.
3. KTF and KFM slider types are suitable for applications with minimum installation length dimensions. When used with an extended arm, they can eliminate the adverse effects of misalignment during installation.
4. The KTR type is a miniature self-resetting tie rod structure that requires no traction installation;
5. The KPF type flange face fixing structure can also detect the internal displacement of the cavity.
