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ABB TU845 Termination Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Diverse Signal & High-Load Termination

• 48-Channel Multi-Signal Support: Beyond standard analog/digital signals, it accommodates 100Ω RTD temperature signals (e.g., PT100 sensors for water treatment tank temperature) and current-sinking signals (e.g., pulse encoders for machinery speed feedback)—eliminating the need for additional specialized termination units.
• High-Current Handling: 15A continuous current (vs. TU844’s 10A) and 0.2–4.0mm² wire compatibility support mid-power devices (e.g., 24V DC/12A water pumps, 10A solenoid valves) without external contactors, simplifying wiring for heavy-duty applications.

3.2 Reinforced Signal Protection

• Enhanced Isolation & EMC Immunity: 1kV (channel-channel)/2kV (signal-ground) isolation prevents cross-talk between high-power digital signals (e.g., 15A motor controls) and sensitive RTD/analog signals. EN 61000-6-2 "industrial-level" EMC protection resists interference from nearby high-voltage cables or pumps—ensuring ±0.05% signal accuracy for critical measurements (e.g., chemical concentration sensors).
• Surge Protection Readiness: Dedicated slots for ABB TPS802 surge modules (IEC 61643-1 compliant) — clamps voltage spikes (e.g., lightning-induced surges in outdoor water treatment plants) to <250V DC, protecting S800 I/O modules from permanent damage.

3.3 Efficient Maintenance & Troubleshooting

• Dual Test Points per Channel: Each channel has two 4mm test ports (voltage/current/resistance for RTDs) — technicians can verify RTD resistance (e.g., 138.5Ω for 100°C PT100) or analog current (e.g., 8mA from a flow sensor) without disconnecting wires, cutting troubleshooting time by 60% vs. TU844.
• LED Status Indicators:
  • Green "POWER": Illuminates when the unit is powered.
  • Yellow "SURGE": Flashes if a surge event triggers the TPS802 module (alerts for module replacement).
  • Red "FAULT": Lights for terminal short circuits or open circuits (e.g., broken sensor cables).
• Field-Module Isolation: Field wires connect to front terminals; prefabricated ABB link cables (e.g., 3HAC031684-003) link to S800 I/O modules — replacing a faulty I/O module takes <3 minutes (no field wire removal).

4. Typical Applications

• Petrochemical Auxiliary Units: Terminates 48 signals (24 AI/RTD: heat exchanger temperature/pressure; 24 DO: pump/valve control) — 15A capacity handles auxiliary pump motors, and surge protection resists electrical interference from main process units.
• Large Water Treatment Plants: Connects 24 PT100 RTDs (tank temperature) and 24 4-20mA flow sensors (filter flow rates) to S800 I/O modules — optional IP40 adapter protects against filter dust.
• Heavy Machinery Control: Supports 48 signals (24 DI: machinery safety interlocks; 24 DO: hydraulic valve controls) for a construction equipment assembly line — 30A peak current tolerance handles valve inrush surges.

5. Usage Notes

1. Wire & Load Management:
   • For 2.5–4.0mm² high-current wires, use a torque screwdriver (1.0–1.2N·m) to secure terminals — over-tightening damages spring clamps; under-tightening causes loose connections.
   • Do not exceed 15A per terminal — use ABB contactors (e.g., A16-30-10) for devices >15A (e.g., 20A fans).
2. RTD Signal Wiring:
   • For PT100 RTDs, use 3-wire/4-wire shielded cables (≤100m) to eliminate lead resistance errors — pair with S800 AI840 modules for accurate temperature measurement.
3. Surge & Environmental Protection:
   • In lightning-prone or outdoor areas (e.g., open-air water treatment plants), install ABB TPS802 surge modules and ground to a dedicated earth bar (resistance ≤0.5Ω).
   • In dusty environments (e.g., cement plant auxiliaries), use the optional IP40 adapter (ABB part no. 3HAC032011-001) and seal cable entries with dust-proof glands.
4. Link Cable Authenticity:
   • Use only ABB-approved link cables (e.g., 3HAC031684-003) — third-party cables may have incorrect pinouts or insufficient insulation, causing signal loss or isolation failures.
5. Maintenance Scheduling:
   • Test surge modules annually via AC 800M Control Builder M — replace if the yellow "SURGE" LED is lit.
   • Clean terminals quarterly with a dry brush (avoid liquids) to prevent dust buildup, which leads to high resistance and signal distortion

The structure and details of the product：

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