TAC Xenta 451A SCHNEIDER

TAC Xenta 451A SCHNEIDER Power module

Product  Description：

The Schneider Electric TAC Xenta 451A is a controller used within the TAC Vista Building Management System (BMS), which is now part of the wider EcoStruxure Building Operation portfolio. It functions as a LonWorks-based general-purpose controller designed for the control and monitoring of various systems and equipment within a building, particularly focusing on HVAC and other utility plant controls.

Product Specifications

• Product Type: LonWorks-based General Purpose Controller

• Model: TAC Xenta 451A (often abbreviated to Xenta 451A)

• Communication Protocol: LonTalk protocol over a LonWorks FTT-10A twisted-pair network.

• Operating Voltage: $24 \text{ VAC}$

• Inputs:

  • Universal Inputs: 8 inputs (configurable as digital, analog 0-10 V, or resistive temperature sensor inputs, e.g., NTC 10k $\Omega$)

  • Digital Input: 1 dedicated digital input for connection to a pulse counter or similar signal.

• Outputs:

  • Analog Outputs: 4 outputs ($0-10 \text{ VDC}$)

  • Digital Outputs: 4 outputs (relay, normally open contacts, suitable for switching $24 \text{ VAC}$ loads)

• Built-in Display and Keypad: Features a built-in display and keypad for local monitoring, setting adjustments, and commissioning.

• Program Memory: Non-volatile memory for application programs and configuration data.

• Operating Temperature Range: Typically $0 \text{ to } 50^\circ\text{C}$ (Standard industrial temperature range)

Product Advantages

• Distributed Intelligence: As a LonWorks controller, the Xenta 451A provides distributed intelligence. It can execute control strategies locally and operate independently of the central server, enhancing system reliability and response time.

• Flexible I/O Configuration: The eight universal inputs offer significant flexibility, allowing the same physical hardware to connect to different types of sensors (temperature, pressure, occupancy, voltage), reducing the need for multiple specialized modules.

• Local Interface: The integrated display and keypad allow engineers and operators to check status, override points, and perform basic commissioning directly at the unit, streamlining maintenance and troubleshooting.

• Open Protocol: LonWorks is an open standard, facilitating integration with other LonWorks-compliant devices and systems from different manufacturers.

• Integration with BMS: It integrates seamlessly with the TAC Vista (now EcoStruxure Building Operation) platform, allowing for centralized configuration, scheduling, alarming, and data trending.

Important Considerations (Precautions)

• Wiring and Voltage: The unit uses $24 \text{ VAC}$ for power; ensure the correct voltage is supplied. All wiring must adhere to local and national electrical codes, and correct terminal types and torque must be used.

• Network Isolation: As with any LonWorks device, proper network topology, termination, and noise reduction techniques are essential to ensure reliable communication. Avoid running LonWorks network cables parallel to high-voltage power lines.

• Load Limits: Do not exceed the specified current and voltage ratings for the digital (relay) outputs. If the load exceeds the relay rating, an external contactor or relay must be used.

• Programming Environment: Configuration and programming are typically done using specific Schneider Electric tools like TAC Menta (a graphical programming tool) or through the central BMS software. Proper training is required for application development.

• Product Lifecycle: The Xenta 451A is part of an older product generation. While still supported by Schneider Electric, new installations are often directed toward the latest EcoStruxure Building Operation controllers (e.g., the SpaceLogic series) for future-proofing and advanced capabilities.

Product Applications

The TAC Xenta 451A is primarily used in commercial and institutional buildings to provide reliable, distributed control for medium to large-sized equipment.

• Air Handling Unit (AHU) Control: Controlling temperature, humidity, and ventilation rates by modulating dampers, heating coils, and cooling coils.

• Boiler and Chiller Plant Control: Managing the staging, sequencing, and optimizing of primary mechanical equipment in a central plant, including pumps and isolation valves.

• Variable Air Volume (VAV) System Control: Although primarily a general-purpose controller, it can serve as a zone controller or master controller for VAV boxes, managing zone temperature and static pressure.

• Lighting Control Integration: Using its digital inputs and outputs to interface with lighting panels for schedule-based or occupancy-based control.

• Pumping and Fan Control: Controlling the speed (via $0-10 \text{ V}$ outputs to VFDs) or on/off status of building service pumps and fans.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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