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ABB TU844 Termination Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Mid-Density Stable Termination

• 40-Channel Capacity: 20 dual-channel terminals strike a balance between density and space efficiency—ideal for I/O racks with moderate signal counts (e.g., 40 signals for a chemical reactor’s temperature/pressure monitoring or HVAC zone control).
• Secure Connections: Spring-clamp terminals ensure vibration-resistant wiring (avoids loose connections in industrial cabinets) and support both tool-free (thin wires) and screwdriver-assisted (thicker wires) installation, adapting to common field wiring gauges.

3.2 Basic Signal Protection & Integrity

• Electrical Isolation: Prevents cross-talk between analog (e.g., 4-20mA flow sensor signals) and digital (e.g., 24V DC valve commands) channels, maintaining ±0.1% signal accuracy—critical for process control stability (e.g., maintaining chemical mixing ratios).
• EMC Immunity: Complies with EN 61000-6-2 (industrial-level EMC protection), resisting interference from nearby power cables or motors—avoids signal distortion in noisy environments (e.g., manufacturing workshops with heavy machinery).

3.3 Simplified Maintenance

• Integrated Test Points: Each channel has a 4mm test port—technicians can measure signal values (e.g., 12mA from a pressure sensor) without disconnecting wires, cutting troubleshooting time by 40%.
• Field-Module Isolation: Field wires connect to front terminals; prefabricated ABB link cables (e.g., 3HAC031684-002) link to S800 I/O modules. Replacing a faulty I/O module takes <5 minutes (no field wire removal).
• Clear Labeling: Color-coded terminal markers (analog: blue; digital: gray) and etched numbering (1–40) minimize wiring errors during commissioning or maintenance.

4. Typical Applications

• Chemical Processing Auxiliaries: Terminates 40 signals (20 AI: tank level/temperature; 20 DO: pump/solenoid control) for a solvent mixing unit—isolation prevents signal interference from agitator motors.
• Industrial HVAC Systems: Connects 40 signals (20 AI: zone temperature/humidity; 20 DI: air handler status) to an S800 I/O rack—test points simplify "no-cooling" fault diagnosis.
• Medium-Scale Manufacturing: Supports 40 digital signals (photoeyes, limit switches) for a conveyor system in an electronics assembly line—vibration-resistant terminals ensure stable operation.

5. Usage Notes

1. Wire Compatibility: Use 0.2–2.5mm² stranded copper wires; for 1.5–2.5mm² wires, torque screwdrivers to 0.5–0.8N·m (over-tightening damages spring clamps).
2. Link Cable Authenticity: Only use ABB original link cables (e.g., 3HAC031684-002)—third-party cables may have incorrect pinouts, causing signal loss.
3. Load Limitation: Do not exceed 10A per terminal; use external contactors for devices >10A (e.g., 15A fans).
4. Environmental Protection: Mount away from heat sources (e.g., power supplies) in cabinets; maintain ≥20mm clearance for airflow to prevent overheating.
5. Maintenance Checks: Clean terminals quarterly with a dry brush to remove dust (avoids high resistance); test isolation resistance annually (target ≥100MΩ) with an insulation tester.

The structure and details of the product：

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