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Smart System Performs Reciprocating Motion & Force Sensing Without a PLC or External Sensors
Automation is key for repetitive tasks like operating test fixtures that need to be run over and over again. In this post, we'll explore how to achieve reciprocating motion—back-and-forth cycles—using a product that doesn’t require a PLC or external presence sensors, which can significantly speed up your design process.
Let’s consider an example of an endurance testing application where a test fixture is needed to press a red button 10,000 times. For this task, an actuator must move up and down repeatedly to simulate the pressing action. Traditionally, an external pressure sensor or presence sensor would be used to send a signal to the actuator, instructing it when to stop pressing and return to its home position. A PLC is also usually required to manage these input and output signals. This approach involves multiple components, increasing costs and requiring additional knowledge, inventory, and labor to implement the system successfully.
But there might be a simpler solution.
**The Challenge:**
Develop a reciprocating motion and torque sensing system without relying on a PLC or external sensors.
**Traditional Setup:**
Endurance test equipment that uses an external sensor along with a host PLC to press a button 10,000 times.
**Problems with Traditional Setup:**
- Multiple components need to be integrated, including motors, actuators, drivers, sensors, and PLCs.
- The external host controller (PLC) increases costs.
- External sensors are necessary for limiting motion and sensing force.
- More expertise, inventory, and labor are required to integrate everything effectively.
**A Better Approach:**
Oriental Motor offers solutions that can simplify this process. Their EAC Series motorized cylinders and stored data driver systems provide advanced capabilities that can replace many traditional components.
For repetitive push and pull applications, an electric linear cylinder system is ideal for performing linear motion. By using a stored data type driver, which supports automatic sequential operations, you can eliminate the need for certain PLC functionalities.
Oriental Motor’s EAC Series motorized cylinders come equipped with advanced features such as AlphaStep hybrid control technology. This technology automatically switches between open-loop and closed-loop operation to ensure precise position control without errors. Additionally, the built-in mechanical absolute encoder (ABZO sensor) tracks absolute position coordinates, eliminating the need for a backup battery. The EAC Series also offers optional pre-assembled linear guides to handle moment loads, reducing the need for external guides.
With these pre-assembled components, guaranteed specifications, and built-in functions, engineers can focus their efforts on enhancing other aspects of their designs.
In this scenario, the PLC’s role is to send commands to the driver to dictate when and how far the actuator should move. Oriental Motor’s advanced point-to-point programming enables continuous looping motions without a PLC. This is known as Automatic Sequential Operation.
Furthermore, the driver’s push motion function can substitute for pressure or torque sensors. For instance, by setting the push motion at 20%, a dedicated TLC output signal can indicate when the actuator reaches that torque level. The actuator can then be programmed to return to its home position upon detecting that threshold. Essentially, the system can be set up so that the actuator presses the button, senses the 20% load torque, moves back to the home position, and repeats the cycle. Additional programming can be added to start the operation after a homing procedure or when the system is ready. Various physical or remote I/O signals can trigger specific motion sequences (see Event Trigger function).
To configure the motion data and system parameters or monitor the EAC Series’ statuses, download Oriental Motor’s powerful MEXE02 universal product support software. This tool simplifies setup and monitoring, ensuring smooth operation.
**Advantages of the EAC Series:**
- Pre-assembly reduces time and labor.
- Built-in absolute ABZO sensor eliminates the need for external home and limit sensors, as well as an absolute encoder and battery.
- Built-in push motion function replaces pressure or torque sensors.
- Built-in loop programming removes the need for a PLC.
- High-efficiency design supports high-duty applications.
**Results:**
By implementing the EAC Series, you can achieve simpler designs, lower costs, and faster time to market.
Check out how easy it is to program reciprocating motion using the MEXE02 software. Watch more videos, such as push motion settings or palletizing operations, to see the full potential of this system.
Discover all our linear motion solutions today!
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