Mitsubishi Tension Controller Le 30 Cta — Manual Exclusive ~repack~

Mastering Web Stability: An Exclusive Guide to the Mitsubishi LE-30CTA Tension Controller

In the world of converting, printing, and flexible packaging, web stability is the difference between a premium product and expensive waste. While mechanical rollers and unwind shafts do the heavy lifting, the brain of the operation is the tension controller.

Among the legacy workhorses of the industry, the Mitsubishi LE-30CTA Tension Controller stands out for its reliability and precision. Often found in older yet robust machinery, these units require specific handling. This article serves as an exclusive guide to the unit's functionality, bridging the gap between a standard spec sheet and the operational manual.

What the feature does exclusively:

  1. Automatic taper tension reduction
    As the roll diameter increases (rewind) or decreases (unwind), the controller automatically reduces tension output by a user-defined taper percentage (0–99%). This prevents core crushing or telescoping. mitsubishi tension controller le 30 cta manual exclusive

  2. Two independent taper patterns (selectable via manual parameter F12):

    • Linear taper: Tension decreases linearly with diameter.
    • Curved taper (exclusive to LE-30 series): Taper follows a logarithmic curve, ideal for non-woven materials or stretchy films.

  3. Diameter memory retention
    After power-off, the last calculated diameter is stored in non-volatile EEPROM — no need to re-teach on next run. Mastering Web Stability: An Exclusive Guide to the

  4. Diameter presetting
    You can manually input starting core diameter and final roll diameter for closed-loop control without a dancer roller.

2.2 Rear Terminal Block Wiring (Critical Safety Information)

The manual exclusively warns about these common mistakes: | Terminal | Signal | Exclusive Warning | | :--- | :--- | :--- | | 1, 2 | AC Power (100-240V) | Do NOT share neutral with a VFD – causes ground loops. | | 3 | Earth Ground | Mandatory for noise immunity. | | 4, 5 | Load Cell Signal (+/-) | Use twisted, shielded pair. Ground shield only at controller end. | | 6, 7 | Excitation Voltage (5V/10V) | Set DIP switch inside before powering on. | | 8, 9 | Analog Output (to brake) | Output impedance: <1k ohm. Do not short to ground. | | 10, 11 | Run/Stop Input (dry contact) | Use a relay, not a solid-state switch. | Automatic taper tension reduction As the roll diameter

Exclusive Tip: The manual notes that if you see “Er-5” on startup, one of your load cell wires is reversed relative to terminal 5.

Part 4: Step-by-Step Exclusive Calibration Procedure

Most users fail because they skip the zero and span calibration sequence. Here is the exact method from page 47 of the technical manual:

Tuning and Setup (Practical Steps)

  1. Initial wiring & power-up: confirm sensor wiring and power. Check for alarms on start.
  2. Sensor calibration: zero load cell at no-tension; apply known weights to set span. For dancer, set midpoint position as zero tension reference.
  3. Set control mode: choose tension-loop or speed-loop based on where control is applied (brake, dancer, or drive).
  4. PID baseline: start with conservative gains — low P, I, and D off. Gradually increase P until small oscillations appear, back off ~20%. Increase I to remove steady-state error. Add D only if needed to damp oscillations.
  5. Filter & sample time: increase filtering if noise; avoid excessive filter that slows response.
  6. Test with process load: run at production speed and check tension across different widths and roll diameters; adjust gain scheduling or use automatic tension compensation if available.
  7. Alarms & limits: set safe max/min tension, sensor fault thresholds, and motor/drive interlocks.

Phase A: Zero Calibration (No Tension)

  1. Remove all web material. Ensure no external force on idler/dancer.
  2. Power up controller. Wait 20 minutes for thermal stabilization (exclusive requirement for 0.1% accuracy).
  3. Select parameter F31.
  4. Press and hold SET until display flashes "0".
  5. Wait for "End" on screen.

Real-world application example (from manual’s application section):

For a film rewinder:
Set F08 = 30% taper, F12 = 1 (curved).
At 100 mm diameter → 100% tension.
At 300 mm diameter → 70% tension.
At 500 mm diameter → 50% tension.
Prevents edge wrinkles on soft film rolls.