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ABB TU831 Extension Module Termination Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Expansion of Termination Capacity

• 48-Channel Extension: Adds 48 signals to existing termination systems—for example, pairing with a TU841 (40 channels) creates a 88-channel termination solution in an S800 I/O rack, avoiding the need for additional racks (saves 30% cabinet space).
• Seamless Integration with Primary Units: Connects to TU840/TU841 via ABB extension cables (e.g., 3HAC031685-001), ensuring uniform wiring logic and signal routing—no reconfiguration of the DCS is required.

3.2 Secure Signal Termination & Protection

• Heavy-Duty Terminals: Handles 0.2–2.5mm² wires (thicker than TU814’s 0.14–1.5mm²) and 10A continuous current, supporting mid-power field devices (e.g., 24V DC solenoid valves, small pumps) that exceed the load capacity of compact units.
• Electrical Isolation: Prevents cross-talk between analog (e.g., 4-20mA pressure transmitters) and digital (e.g., 24V DC proximity sensors) signals, maintaining ±0.1% measurement accuracy for critical processes (e.g., chemical reaction temperature monitoring).

3.3 Simplified Maintenance & Troubleshooting

• Dedicated Test Points: Each channel has a 4mm test port—technicians can measure signals (e.g., 15mA from a flow meter) without disconnecting wires, reducing troubleshooting time by 40%.
• Clear Labeling & Color Coding: Terminal numbering (1–48) and color markers (analog: blue; digital: gray) align with ABB’s primary termination units, minimizing wiring errors during expansion or maintenance.
• Field-Module Isolation: Field wires connect to the TU831’s front terminals; prefabricated link cables link to S800 I/O modules—replacing a faulty I/O module takes <5 minutes (no field wire disconnection).

4. Typical Applications

• Power Plant Auxiliary Control: Extends a TU841’s 40 channels by 48, terminating 88 signals (48 AI: feedwater flow/pressure; 40 DI: valve status) for a boiler’s auxiliary systems.
• Chemical Processing Line: Adds 48 channels to an S800 I/O rack, connecting 24 4-20mA analytical sensors (pH, conductivity) and 24 24V DC control valves in a batch reactor system.
• Automotive Assembly Line: Supports 48 digital signals (photoeyes, limit switches) for a conveyor system, extending the capacity of a primary TU840 to cover the entire line’s sensor network.

5. Usage Notes

1. Wire Compatibility: Use 0.2–2.5mm² stranded copper wires; for 1.5–2.5mm² wires, use a torque screwdriver (0.5–0.8N·m) to avoid damaging spring clamps.
2. Extension Cable Authenticity: Only use ABB-approved extension cables (e.g., 3HAC031685-001) to connect to primary units—third-party cables cause signal loss or isolation failures.
3. Load Limitation: Do not exceed 10A per terminal (e.g., avoid connecting 15A motors directly); use external contactors for high-power devices.
4. Clearance Requirement: Maintain ≥50mm clearance around the unit for airflow—critical in high-temperature cabinets (e.g., power plant control rooms) to prevent terminal overheating.
5. Configuration Alignment: Ensure the TU831’s channel numbering is mapped to the DCS via Control Builder M (same as primary units) to avoid signal misrouting

The structure and details of the product：

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