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ABB TU814 Compact Modular Termination Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Space-Efficient Medium-Density Termination

• 32 Channels in 80mm Width: 16 dual-channel terminals deliver 2x more channels than the TU810 (16 channels) while maintaining a compact profile—fits in narrow cabinet slots (e.g., 80mm-wide bays in packaging machine controllers) where full-size units (TU840/TU841) cannot be installed.
• Tool-Free Small-Gauge Wiring: Miniature spring-clamp terminals accept 0.14–1.5mm² wires (common for sensors like photoelectric switches or small solenoids) without tools, reducing installation time by 40% vs. screw-terminal alternatives.

3.2 Signal Protection & Accuracy

• Electrical Isolation: Prevents cross-talk between low-level analog signals (e.g., 4-20mA from temperature probes) and digital signals (e.g., 24V DC limit switch inputs), ensuring ±0.1% measurement accuracy—critical for applications like pharmaceutical batch monitoring or food temperature control.
• Mechanical Shielding: Shields delicate S800 I/O module terminals from accidental damage (e.g., screwdriver slips during wiring), avoiding costly module repairs or replacements.

3.3 Simplified Maintenance & Troubleshooting

• Integrated 2mm Test Points: Each channel has a dedicated micro test port (compatible with 2mm insulated probes) — technicians can measure signal values (e.g., 12mA from a flow sensor) without disconnecting wires, cutting troubleshooting time by 50%.
• Plug-and-Play Link Cables: Uses ABB prefabricated link cables (e.g., 3HAC031682-003) to connect directly to S800 I/O modules. Replacing a faulty I/O module takes <3 minutes (no need to rewire field cables).
• Clear Labeling: Color-coded terminal markers (analog: blue; digital: gray) and etched numbering (1–32) prevent wiring errors during commissioning or maintenance.

4. Typical Applications

• Packaging Machine Control: Terminates 32 signals (16 AI: film tension/temperature; 16 DI: product detection/door interlocks) in a machine-mounted 80mm-wide cabinet.
• Pharmaceutical Small-Batch Reactor: Connects 18 4-20mA sensors (pH, pressure) and 14 24V DC valves to S800 I/O modules in a cleanroom-compatible compact skid.
• Distributed HVAC Sensors: Supports 32 low-power signals (temperature/humidity sensors) at remote building HVAC control stations with limited cabinet space.

5. Usage Notes

1. Wire Gauge Limitation: Only use 0.14–1.5mm² stranded copper wires—solid wires or larger gauges (e.g., 2.5mm²) will damage the miniature spring clamps.
2. Test Probe Safety: Use 2mm insulated test probes (ABB-approved) to avoid short-circuiting adjacent terminals (risk of signal loss or I/O module damage).
3. Link Cable Compatibility: Always use ABB original link cables (e.g., 3HAC031682-003)—third-party cables may have incorrect pinouts, causing communication failures.
4. Clearance for Airflow: Maintain ≥20mm clearance above/below the unit in enclosed cabinets (prevents overheating in high-temperature environments like bakery or brewery control boxes).
5. Vibration Considerations: In high-vibration applications (e.g., industrial mixers), secure the TU814 to the cabinet with additional mounting clips (ABB part no. 3HAC032012-001) to avoid terminal loosening.

The structure and details of the product：

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