Digital Automatic Constant Tension Controller

Built with high-precision A/D and D/A converters, industrial-grade tension detectors, and a high-performance microcontroller, the Digital Automatic Constant Tension Controller provides robust operational stability for automated web production setups. During operation, tension sensors continuously capture live web tension and relay the signal back to the unit. The internal processor executes rapid PID algorithms to dynamically adjust the D/A output signal, regulating the excitation current of magnetic powder clutches/brakes or governing servo motor output torque. This maintains unwavering tension throughout the process, effectively eliminating material stretching, wrinkling, tension spikes, and telescoping during rewinding.

Technical Specifications

Model: ZXT-D-600N / ZXT-D-1000N / ZXT-D-2000N

Power Supply Input: AC 220V / 50Hz

Output Current: Magnetic powder 0–2A / 3A constant current

Compatible Tension Detectors: Flange-mount / Shaft-mount tension sensors

Installation Method: Panel embedded mounting

Application Fields

Designed for demanding industrial roll material processing, the ZXT-D series ensures consistent tension accuracy across various converting sectors:

Flexible Packaging & Printing: Maintains precise tension during high-speed printing and laminating of plastic films, aluminum foil, and composite substrates to prevent print misregistration and inter-layer bubbling.

Slitting & Coating Lines: Delivers immediate tension feedback on high-speed slitters and coaters, ensuring uniform coating application and cleanly wound roll edges.

Paper & Non-Woven Converting: Ideal for paper, non-woven fabric, and technical textiles, effectively preventing web breakage and material stretching under fluctuating line speeds.

Key Advantages

High-Resolution 2000-Step Output: Features a 2000-step tension output resolution for micro-adjustments, significantly enhancing control precision and subtle tension tuning.

Rugged Aluminum Panel & Anti-Interference Architecture: Constructed with a heavy-duty aluminum front panel and an integrated mainboard circuit design, offering superior noise immunity in harsh industrial electromagnetic environments.

RS485 Communication Interface: Standard RS485 connectivity supports integration with PLCs, host computers, and MES platforms for centralized data collection and remote monitoring.

Optional Ultrasonic Taper Tension Control: Accommodates optional ultrasonic sensor modules to automatically taper tension in response to changing roll diameters, optimizing rewinding structure.

Integrated Emergency Braking: Built-in braking logic halts the roll during routine stops or emergency shutdowns, preventing web slack and material breakage to protect overall equipment operation.

Selection Guide

When selecting the Digital Automatic Constant Tension Controller, consider your specific material properties, web width, roll weight, process requirements, actuator type, and plant automation standards:

1.Confirm Actuator Type: For equipment paired with magnetic powder clutches or brakes, select the standard ZXT-D configuration. For lines driven by servo motors on unwinds or rewinds, opt for the servo-compatible control variant to ensure proper signal matching.

2.Evaluate Taper Tension Needs: If significant rewinding diameter growth causes film rolls to buckle or telescope (tight outside, loose inside), specify the optional ultrasonic taper tension module. For rigid paper substrates or minimal diameter shifts, the baseline constant tension setup is fully sufficient.

3.Assess System Connectivity: Select models with the standard RS485 communication bus when connecting to factory PLCs or MES networks for real-time monitoring. For standalone equipment operating independently, basic control models fulfill all operational needs.

Why Choose Us?

Backed by decades of field experience in flexible packaging and web handling machinery, Kechuang designs products tailored directly to the core tension challenges faced in printing, laminating, slitting, and coating lines. Every aspect—from hardware topology to control firmware—is engineered specifically for heavy-duty converting conditions.

Unlike generic off-the-shelf tension meters, our Digital Automatic Constant Tension Controller is purpose-built for high-speed flexible packaging machinery. It balances fine control accuracy, long-term durability, and system adaptability—helping factory operators reduce material waste, avoid unplanned downtime, and generate higher overall yield on every production line.

FAQ

Q1: What causes severe tension fluctuations during production?

A: First, verify that tension detectors are securely mounted and that sensor cables are shielded and separated from high-voltage power lines to block electromagnetic noise. Next, re-tune the PID parameters to match substrate elasticity. Finally, inspect the magnetic powder brake/clutch for wear or unstable torque output. The integrated controller mainboard inherently resists electrical noise when properly wired.

Q2: How can I resolve RS485 communication failures with a PLC or MES system?

A: Ensure the station address, baud rate, and parity settings match between the controller and the host master. Check that A/B signal lines are not inverted, verify that bus termination resistors are enabled where necessary, and confirm proper cable shielding and grounding.

Q3: How is the taper tension function enabled?

A: Taper control is an optional feature requiring an external ultrasonic diameter sensing kit. Once connected, activate Taper Mode in the system menu and configure your desired attenuation coefficient; the unit will automatically scale down tension as the roll diameter grows. Without the sensor kit, the unit functions in standard constant tension mode.

Q4: Under what conditions does the braking function operate?

A: The braking module activates during machine stops and emergency shutdowns, outputting a reverse braking signal to prevent web unspooling and breakage. Operators can adjust the braking delay time in the settings menu to harmonize with overall line stopping sequences.

Q5: Does the controller undergo factory burn-in testing prior to delivery?

A: Yes. Every completed unit undergoes full-power electrical burn-in and simulated operational testing to verify hardware functions and measurement accuracy before shipment.