TAC Xenta 421A SCHNEIDER

TAC Xenta 421A SCHNEIDER Power module

Product  Description：

The Schneider Electric TAC Xenta 421A is an older generation LonWorks-based controller designed for Heating, Ventilation, and Air Conditioning (HVAC) and building control applications. It is part of the TAC Xenta line, which focused on providing distributed intelligence for Building Management Systems (BMS).

Product Specifications

• Product Type: Programmable LonWorks Controller

• Application: Specifically designed for complex Variable Air Volume (VAV) boxes, Fan Coil Units (FCUs), or other similar small to medium-sized HVAC applications.

• Communication Protocol: LonTalk protocol over LonWorks Free Topology twisted pair (FTT-10A), allowing peer-to-peer communication and distributed control.

• Power Supply: Typically operates on $24 \text{ VAC}$.

• Inputs: Features a flexible mix of analog and digital inputs, which may include terminals for sensors like temperature, humidity, and pressure, as well as digital inputs for status monitoring. The exact number and type of I/Os can vary or be configurable.

• Outputs: Includes a combination of digital (relay) outputs for controlling devices like fans and pumps, and analog outputs for modulating devices like damper actuators and valves.

• Control Strategy: It utilizes a pre-programmed application or is custom programmable using a configuration tool (such as TAC Menta or LonMaker) to implement specific control sequences.

• Housing: Designed for mounting on a DIN rail or directly inside a control panel.

Product Advantages

• Distributed Intelligence: As a LonWorks controller, the Xenta 421A operates autonomously and communicates peer-to-peer with other controllers, providing robust, reliable distributed control and reducing reliance on a central server.

• Optimized for HVAC: The hardware and pre-engineered applications are specifically tailored for common HVAC functions (like VAV control), which simplifies commissioning and setup for building automation technicians.

• Open Protocol: LonWorks is an open networking protocol, which theoretically allows the controller to communicate and integrate with LonWorks devices from other manufacturers.

• Field Bus Communication: LonWorks allows for a simple, robust wiring scheme (Free Topology) which can reduce installation costs and provide flexible network design.

• Comprehensive Control: It is capable of handling sophisticated control loops and sequences, including optimal start/stop and energy-saving functions.

Important Considerations (Precautions)

• Legacy Status: The TAC Xenta line is a legacy product series from Schneider Electric and has largely been superseded by newer platforms (e.g., EcoStruxure Building Operation with the new generation controllers). Finding spare parts and manufacturer support may become increasingly difficult.

• Network Integration: Integration with modern IT networks may require specialized LonWorks-to-IP routers or gateways, which adds complexity.

• Configuration Tools: Programming and configuration require specific LonWorks development and network management tools (like LonMaker or TAC Menta), which may require specialized training.

• Power Supply: Always ensure the controller is supplied with the correct $24 \text{ VAC}$ power and that the power supply is adequately sized for the controller and all connected field devices (actuators, sensors).

• Wiring Standards: Adhere to LonWorks wiring specifications for the FTT-10A network, particularly concerning wire gauge, distance limits, and termination to ensure reliable network communication.

Product Applications

The TAC Xenta 421A is primarily used in commercial buildings, schools, hospitals, and light industrial facilities as a local control device for the following applications:

• Variable Air Volume (VAV) Box Control: Modulating VAV dampers, controlling heating/cooling coils, and monitoring discharge air temperature in zone control applications.

• Fan Coil Unit (FCU) Control: Controlling fan speed and modulating valves for heating and cooling in individual rooms or zones.

• Unitary Control: Managing the operation of small air handling units, heat pumps, or other dedicated equipment.

• Distributed Control System: Acting as a node within a larger Building Management System (BMS) where it exchanges data (network variables) with a network manager or other zone controllers for sequence coordination and system-wide optimization.

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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