Allen‑Bradley 321131‑A01 / 337672‑A01 Drive Control Board Assembly

The Allen‑Bradley 321131‑A01 paired with 337672‑A01 forms a complete main control board assembly for Rockwell legacy AC variable‑frequency drives. It serves as the core logic processing unit, executing motor control algorithms, handling I/O signal acquisition and fault detection, and processing user‑given speed and start‑stop commands for drive operation.

This PCB assembly integrates CPU, memory, signal conditioning circuits and multiple internal connectors, cooperating with drive power section and auxiliary power supply board. It is a key aftermarket spare for maintenance, overhaul and retrofitting of old‑generation drive equipment in manufacturing and process‑industry sites.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation); Model:321131‑A01, 337672‑A01; Type: Drive Main Control Board Assembly
• Applicable Device: Rockwell legacy series AC variable‑frequency drives
• Power: Powered by drive internal auxiliary power supply; On‑board CPU and memory for drive logic operation
• Interface: Multiple internal board‑to‑board connectors, analog & digital signal terminals, status LED indicators
• Function: Motor control algorithm execution, signal sampling, fault diagnosis, parameter storage, command processing
• Feature: Plug‑in internal installation, industrial anti‑interference design, parameter‑persistent storage
• Installation: Internal plug‑in assembly inside frequency‑converter cabinet
• Operating Environment:0℃ ~ +60℃, 5%‑95% RH non‑condensing
• Certifications: CE compliant for industrial variable‑frequency‑drive automation applications

Core Functions

• Run drive control algorithms to realize V/F or vector control logic and output control instructions to power drive section.
• Collect analog and digital feedback signals from motor and drive internal circuits for real‑time operating‑condition monitoring.
• Store drive configuration parameters and fault history data, supporting local or upper‑level tool parameter reading‑writing.
• Complete self‑diagnosis for over‑current, over‑voltage, over‑temperature and other faults, trigger protection and alarm output.
• Receive start‑stop, speed reference commands from keypad or external PLC system to adjust motor running state.
• Adopt plug‑in structural design, convenient for on‑site disassembly and replacement during drive maintenance work.

Application Scenarios

• Core logic control component for legacy Rockwell AC variable‑frequency‑drive motor‑control systems.
• Main‑board spare part for conveyor, pump and fan drive‑control equipment in manufacturing workshops and process‑industry sites.
• Retrofit and spare replacement for legacy 321131‑A01 / 337672‑A01 control‑board drive‑hardware upgrade projects.
• Frequency‑converter overhaul, control‑loop debugging and faulty main‑control‑board replacement tasks.
• Spare‑parts inventory for drive‑system integrators and industrial automation engineering contractors.

• Global aftermarket spare supply for technical teams maintaining Allen‑Bradley legacy variable‑frequency‑drive hardware.