Emerson Control Techniques Unidrive SP UNI3403 Drive Control Board

Name: Emerson Control Techniques Unidrive SP UNI3403 Drive Control Board
Brand: Control Techniques

Model: UNI3403

Brand Control Techniques

Series Unidrive SP

Model UNI3403

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Product Details And Specifications

Control Techniques (Emerson) Unidrive SP Series Technical Notes

The Control Techniques Unidrive SP series — manufactured by Control Techniques, a division of Emerson Industrial Automation — is one of the most widely deployed AC variable-speed drive platforms in global heavy industry. Installed across petrochemical refineries, nuclear auxiliary systems, offshore platforms, pulp and paper mills, and large-scale water treatment facilities, the Unidrive SP platform covers output ranges from 0.37 kW to 1.9 MW. Its modular architecture, open-loop and closed-loop vector control capability, and broad fieldbus compatibility made it the reference platform for process-critical applications throughout the 2000s and 2010s. The UNI3403 is a drive control board (main control PCB) used within the Unidrive SP frame size 3 range, responsible for PWM signal generation, parameter storage, I/O interfacing, and drive protection logic.

The Evolution of Unidrive SP Architecture

Control Techniques introduced the Unidrive SP platform in the early 2000s as the successor to the original Unidrive Classic series. The Classic series used a proprietary single-board architecture with limited fieldbus options; the SP generation introduced a modular slot-based system supporting SM (Solutions Module) expansion cards for PROFIBUS-DP, DeviceNet, CANopen, EtherNet/IP, and encoder feedback. Frame sizes 1 through 6 cover single-phase and three-phase input from 200 V to 690 V. The control board architecture remained largely consistent across frame sizes, enabling cross-frame parameter compatibility via SmartCard. In later production runs, Control Techniques introduced the Unidrive M series as the modern successor, with enhanced onboard Ethernet and IEC 61131-3 PLC functionality. However, the Unidrive SP remains in active service at thousands of installed sites globally, and replacement control boards such as the UNI3403 remain critical spare parts for lifecycle maintenance programs.

Unidrive SP Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked components within the Unidrive SP ecosystem. Each entry reflects a distinct functional role within the drive system:

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