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ABB TU841 Modular Termination Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Medium-Density Signal Termination

• 40-Channel Capacity: 20 dual-channel terminals balance density and space efficiency—suits I/O racks with moderate signal counts (e.g., 40 signals for a chemical reactor’s temperature/pressure monitoring).
• Secure Connections: Spring-clamp terminals ensure vibration-resistant wiring (avoids loose connections in power plant control cabinets) and support tool-free installation for thin wires (0.2–1.5mm²).

3.2 Basic Signal Protection

• Electrical Isolation: Prevents cross-talk between analog (e.g., 4-20mA pressure signals) and digital (e.g., 24V DC valve commands) channels, maintaining signal accuracy (±0.1%).
• Optional Surge Protection: Dedicated slots for ABB TPS801 surge modules (for lightning-prone areas) — clamps voltage spikes to <300V DC, protecting I/O modules from damage.

3.3 Easy Maintenance

• Field-Module Isolation: Field wires connect to front terminals; prefabricated ABB link cables link the TU841 to I/O modules. Replacing a faulty I/O module takes <5 minutes (no field wire disconnection).
• Test Points: Each channel has a 4mm test port—technicians can measure signals (e.g., 12mA from a flow meter) without wire removal, cutting troubleshooting time by 40%.

4. Typical Applications

• Power Plant Auxiliary Systems: Terminates 40 signals (20 AI, 20 DI) for a boiler’s feedwater pump control—spring-clamp terminals resist vibration from pumps.
• Chemical Processing: Connects 4-20mA temperature sensors (20 channels) and 24V DC solenoid valves (20 channels) to an AC 800M rack—isolation prevents signal interference.
• Commercial HVAC: Links 40 signals (analog temperature, digital fan status) to an S100 I/O rack—test points simplify "no-cooling" fault diagnosis.

5. Usage Notes

1. Use 0.2–2.5mm² stranded copper wires; avoid solid wires (damage spring clamps).
2. Torque screwdrivers to 0.5–0.8N·m for 1.5–2.5mm² wires (over-tightening breaks clamps).
3. Pair with ABB original link cables (e.g., 3HAC031683-001) — third-party cables cause signal loss.
4. Install TPS801 surge modules in outdoor/lightning-prone sites; ground modules to earth bars (resistance ≤1Ω).

The structure and details of the product：

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