Description

The ABB TU890 (3BSC690075R1) is a compact Module Termination Unit (MTU) specifically designed for the S800 I/O system. This passive unit serves as the primary interface for connecting field wiring and process power to I/O modules. It also facilitates the distribution of the ModuleBus to the I/O module and subsequent MTUs, while managing correct addressing through the shifting of outgoing position signals.

Features

• Compact footprint designed for space-efficient S800 I/O installations.
• Integrated ModuleBus distribution for seamless communication between modules.
• Mechanical keying mechanism to prevent the insertion of incorrect I/O modules.
• Secure latching device for stable DIN rail mounting.
• Supports field signal and process power connections via 27 terminals.
• Compatible with a wide range of S800 I/O modules, including AI890, AI893, AI895, AO890, AO895, DI890, and DO890.

Applications

The TU890 is widely utilized in industrial environments requiring high-density, reliable I/O termination, particularly in sectors such as:

• Oil and Gas: Offshore platforms, wellhead collection stations, and storage facilities.
• Chemical Processing: Hydrogenation units, flammable solvent storage, and chemical delivery pump stations.
• Logistics and Safety: Power and safety interlock monitoring for hazardous liquid chemicals.
• Coal Chemical Industry: Gasification islands and coking workshops.

Technical Specifications

Installation Guidelines

• Mounting: Ensure the unit is securely latched onto a standard DIN rail. The design supports horizontal mounting configurations.
• Safety: Always power down the system before inserting or removing I/O modules from the MTU to prevent electrical arcing or damage to the ModuleBus.
• Handling: Use proper ESD (Electrostatic Discharge) precautions when handling the MTU to protect internal components.
• Wiring: Ensure all field wiring is properly terminated to the designated terminals. Verify that the mechanical keying matches the intended I/O module before installation.
• Environment: Maintain the installation within the specified ambient temperature limits (up to 55 degC) to ensure long-term operational reliability.

FAQs

What is the ABB TU890?

The TU890 is a compact Module Termination Unit (MTU) designed for the ABB S800 I/O system, used to connect field wiring and power supply to I/O modules.

What type of terminal connection does it use?

It features 27 terminals for process connections (field signals) and acts as a critical component in compact S800 I/O system architectures.

What is the voltage rating?

The nominal voltage is 24 V DC, with a maximum rated voltage of 50 V.