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Mitsubishi Tension Controller Le 30 Cta Manual Review

The Mitsubishi LE-30CTA is an automatic tension controller designed for high-precision winding and unwinding processes in roll-to-roll production

. It is primarily used to maintain consistent material tension for various substrates like paper, film, foil, and wire. Core Functionality & Features High-Precision Control

: The unit utilizes real-time digital signal processing to maintain tension within tight tolerances (±1–2%), adjusting outputs within milliseconds to prevent material breakage or slack. Dual Mode Operation : It supports both Automatic mode (using feedback from sensors like the LX-TD series) and Manual mode for setup and troubleshooting. Output Versatility : It can output a 0~24V control voltage for magnetic particle clutches/brakes or a 0~5V torque command for AC servo amplifiers. Integrated Functions

: The controller includes linear and ring counter functions, preset capabilities, and latch counters. Manual & Setup Highlights Mitsubishi LE-30CTA Manual

is essential for handling its sensitive analog inputs and ensuring safety. Wiring & Noise Prevention mitsubishi tension controller le 30 cta Manual

: The manual stresses that analog I/O is sensitive to noise. It is critical to use shielded cables

and maintain a distance of at least 100mm between control lines and power lines. : A dedicated Class D grounding

or less) is required. You must perform single-point grounding on the controller side rather than shared grounding with high-power systems to avoid malfunctions. Safety Interlocks

: Because transistor outputs can fail in either an ON or OFF state, the manual advises designing external emergency stop circuits that operate independently of the controller. Parameter Protection The Mitsubishi LE-30CTA is an automatic tension controller

: The "Key-in Inhibit" function is highlighted as a way to prevent accidental changes to material thickness or reel diameter settings during operation. Contentstack Performance Comparison Max Counting Speed 200k pulse/s Input Channels 2-channel DC 5/12/24V Response Accuracy Minimum adjustment time of 25 ns Compatible Detectors LX-TD and LX-TD-928 types

For technical support or to download the latest PDF version of the guide, you can visit the Mitsubishi Electric Global FA Site or specialized repositories like ManualsLib specific part

of the manual, such as the wiring diagrams or the initial parameter setting procedure? LE-30CTN APPLICATION MANUAL - Contentstack

Key Specifications

Chapter 5: Calibration Procedure (Zero & Span)

This is the most frequently accessed part of the manual. If the controller reads 5kg when the roll is empty, you need recalibration. Input: Tension detector (Load Cell/Meter) input

Step 1 – Zero Calibration:

Step 2 – Span Calibration:

The manual explicitly warns: Span must always be set after Zero. Failure to do so will result in non-linear control.

Step 3: Running in Automatic Mode

Once the machine is threaded and running:

  1. Press the Mode Key to switch to AUTO mode. The AUTO indicator will light up.
  2. Use the Up/Down Arrows to change the SV (Set Value) to your desired tension (e.g., 50N, 10kg).
  3. The controller will now automatically adjust the output to maintain this tension.

Basic Wiring (General Idea)

⚠️ Actual pin assignments vary; consult the original manual before wiring.

6. Troubleshooting Common Errors

| Symptom | Possible Cause | Solution | | :--- | :--- | :--- | | PV Display shows "----" or "OF" | Sensor broken or disconnected | Check wiring to Load Cell (E+/E-). Check for cable breaks. | | Tension does not change | Output fuse blown | Check the fuse protecting the brake/clutch circuit. | | PV is unstable/jittery | Mechanical vibration or noise | Increase the Filter parameter; check for ground loops. | | Output is 100% constantly | Tension too low to detect | Check if load cells are physically working; check Zero calibration. | | Control is slow | PID settings incorrect | Decrease P-Band or Integral time. |

Basic setup and commissioning

  1. Power up and verify display/status LEDs.
  2. Configure basic parameters: supply voltage, sensor type (load cell/dancer), control mode.
  3. Set load cell excitation voltage and zero/span calibration:
    • With web tension off, perform zero adjustment.
    • Apply a known tension or standard weight and set span/gain per manual procedure.
  4. Configure control loop gains:
    • Use built-in auto-tune if available.
    • Otherwise start with conservative P/I/D values and adjust while observing tension response.
  5. Verify cascade parameters if motor speed is part of loop (tension loop as outer loop, speed/torque inner loop).
  6. Test alarms and limit settings (over/under tension, motor torque limits).
  7. Run process at low speed and gradually increase while monitoring tension stability.

Critical Parameters