ABB TP851 Terminal Base Unit

Description

ABB TP851 Terminal Base Unit

The ABB TP851 is a high-quality, specialized electrical accessory from ABB’s System 800xA and S800 I/O system families. It is a Power Supply Redundancy Unit (often used as an extension or connection piece for power distribution within the I/O cluster).

Product Detailed Description

The TP851 is primarily designed as a connection/adapter component or a diode block unit used to connect two 24 V DC power supplies in a redundant configuration to the S800 I/O system. It ensures that if one primary power supply unit fails, the secondary power supply seamlessly takes over the load without disrupting the operation of the connected I/O modules, communication interfaces, or field devices.

Technical Parameters

Product Advantages

• High System Availability: By allowing true dual-power redundancy, it eliminates the power supply as a single point of failure for critical I/O stations.
• Compact, Integrated Design: Fits naturally into the S800 I/O footprint, meaning it doesn’t require complex, bulky third-party diode modules inside the control cabinet.
• Seamless Pass-Through: Engineered for low power dissipation and minimal voltage drop across the redundancy circuit, ensuring efficient energy utilization.
• Industrial Durability: Built to withstand standard industrial environments with robust vibration and temperature ratings.

Important Considerations & Precautions

• Voltage Matching: Ensure that both input power supplies are adjusted to identical or highly similar voltage outputs (e.g., both at exactly 24.0 V DC) to ensure balanced load sharing and proper redundancy behavior.
• Current Limitations: Do not exceed the maximum rated current capacity specified for the S800 I/O backplane cluster being fed through this unit.
• Firmware/Hardware Layout: When configuring your S800 I/O station in Control Builder (ABB software), verify that the hardware tree correctly accounts for the power configuration associated with the TP851 module base.
• Wiring Torque: Securely tighten all power terminal connections to prevent high-resistance contacts, which can generate excessive heat and drop the supply voltage.

Product Applications

The ABB TP851 is utilized wherever continuous process uptime is mandatory:

• DCS Control Cabinets: Providing redundant internal power to S800 I/O modules tracking field data in Honeywell, ABB, or third-party distributed control systems.
• Oil, Gas & Petrochemical: Powering critical monitoring loops on offshore platforms or refining facilities where a power outage could trigger an emergency shutdown.
• Power Generation: Used in turbine control systems and auxiliary plant automation where high reliability is expected.
• Continuous Manufacturing: Applied in pulp and paper mills, chemical processing, or water treatment plants to maintain persistent sensor/actuator communications.

Shipping Port: Xiamen, China

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