ABB PCD231B (3BHE025541R0101)

Basic Identification

Model: PCD231B (also referred to as PCD231B101)

Part Number: 3BHE025541R0101

Brand: ABB

Product Type: Exciter Control Module / PEC80-CCI Communication & Control I

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Applicable Systems: UNITROL 5000/6000 Static Excitation Systems, PEC80, AC 800M, 800xA

Country of Origin: Switzerland

General Description

The PCD231B (3BHE025541R0101) is a high-performance controller and communication interface module designed as the core processing unit for ABB's UNITROL series generator static excitation systems. It executes real-time control algorithms, including Automatic Voltage Regulator (AVR), Power System Stabilizer (PSS), and field current regulation. The module also handles high-speed data communication, system interlocks, and protection logic. It is widely used in 1:1 hot-swappable redundant configurations in power plants (thermal, hydro, gas), metallurgy, and heavy process industries.

Technical Specifications

Core System

CPU: 32-bit high-speed real-time processor

Control Cycle: Fast, deterministic cycle for excitation regulation

Redundancy: Supports 1+1 redundant operation with bumpless transfer

Electrical

Supply: 24 VDC (via rack backplane)

Power Consumption: ≤ 20 W

Communication

Ports: Ethernet, RS-232/RS-485

Protocols: Modbus RTU/TCP, IEC 61850, PROFIBUS DP

Environmental

Operating Temperature: -20 °C to +60 °C

Storage Temperature: -40 °C to +70 °C

Humidity: 5%–95% RH, non-condensing

Protection Class: IP20

Certifications: CE, UL, ATEX Zone 2

Mechanical

Dimensions (L×W×H): 142 × 73.5 × 373 mm

Weight: ~1.43 kg

Mounting: Standard ABB rack / 35 mm DIN rail

Hot Swap: Supported

Key Features

Excitation-Specific Control: Integrates AVR, PSS, and field current loops for generator stability.

High-Speed Real-Time Processing: Optimized for fast response in critical power system applications.

Redundancy & Reliability: Native 1:1 hot swap ensures millisecond-level bumpless transfer.

Multi-Protocol Connectivity: Seamless integration with DCS, SCADA, and grid communication networks.

Harsh Environment Rated: Wide temperature range and industrial certifications for power plant and heavy industry use.

Application Scope

Generator static excitation systems (UNITROL 5000/6000, PEC80)

Distributed Control Systems (DCS) (AC 800M, 800xA)

Thermal, hydro, and gas turbine power plants

Metallurgy, chemical, oil & gas industries