ABB TU890 3BSC690075R1 Module Termination Unit

The ABB TU890 3BSC690075R1, also cataloged as the TU890 Module Termination Unit, operates as a dedicated hardware component for intrinsic safety signal termination within ABB automation I/O systems. The unit provides 3x9 signal terminals and an intrinsic safety interface with integrated wiring separation functions.

Hardware Specifications

Intrinsic Safety Interface and Signal Termination

The ABB TU890 provides termination functions for modules requiring intrinsic safety signal handling. The unit incorporates a wiring separator and 3x9 terminal arrangement for field signal connections. The termination structure supports separated signal routing between field devices and ABB control system I/O modules.

The TU890 belongs to the ABB industrial control hardware platform where I/O density scaling and backplane communication compatibility are managed through dedicated module interfaces. The module termination arrangement allows organized field wiring connections and supports system configuration changes without modifying the connected field device circuits.

Frequently Asked Questions

Q: What is the primary function of the ABB TU890 module?
A: The TU890 is a Module Termination Unit with an intrinsic safety interface. It provides signal termination through 3x9 signal terminals and includes a wiring separator for field connection management.

Q: Does the TU890 provide direct communication processing functions?
A: No. The TU890 is a termination and interface component. It does not operate as a standalone controller or communication processor.

Q: What installation consideration applies to the TU890 field wiring?
A: Field wiring should follow intrinsic safety separation requirements. Signal cables should be routed according to cabinet segregation rules to maintain separation between safe and hazardous area circuits.

Field Installation Guidelines

Install the ABB TU890 on the designated automation system mounting structure according to the associated ABB hardware configuration requirements.

Field signal cables should be terminated using the specified terminal arrangement, maintaining correct polarity and signal identification. Intrinsic safety circuits must remain separated from non-intrinsically safe wiring during installation.

Cable shields should be connected according to the system grounding design. Avoid routing signal cables parallel to high-current power conductors to reduce electromagnetic interference. Verify terminal tightening, wiring identification, and enclosure grounding before system commissioning.