ABB PCD235A101 (3BHE032025R0101)

Basic Identification

Model: PCD235A101

Part No: 3BHE032025R0101

Brand: ABB

Product Type: High‑Performance Exciter Control Module / CPU

Applicable Series: AC 800M, UNITROL 6000, Static Excitation Systems (PEC80)

General Description

PCD235A101 is an enhanced 32‑bit PowerPC controller for ABB’s critical generator excitation and process control systems. It acts as the central processing unit in UNITROL 6000/PEC80 excitation racks, executing high‑speed control loops, advanced algorithms (AVR/PSS), and interlock logic. Typically used in 1:1 hot‑swap redundant pairs for bumpless transfer and zero downtime in power plants, metallurgy, and heavy process industries.

Technical Specifications

Core System

CPU: Enhanced PowerPC, ≥500 MHz

Memory: 32 MB RAM, 16 MB Flash

Control Tasks: Fast cycle down to 10 ms configurable

Electrical

Supply: 24 VDC (backplane‑powered via AC 800M rack)

Power Consumption: ≤ 15 W

Field Inputs: 0–5 A AC (CT), ±200 V DC field voltage, ±5 V DC field current

Communication

Ethernet: 2 × 10/100 Mbps (Modbus TCP, IEC 61850)

Fieldbus: PROFIBUS DP, Modbus RTU, CAN (via CI8xx modules)

Protocols: IEC 61850 (GOOSE/MMS), IEC 60870‑5, DNP3

Environmental

Operating Temp: 0 °C … +60 °C

Humidity: 5%–95% RH, non‑condensing

Certifications: cULus, ATEX, IECEx, DNV

Mechanical

Dimensions (H×W×D): 132 × 105 × 52 mm

Weight: ~1.5 kg

Mounting: ABB standard rack / 35 mm DIN rail

Redundancy: 1:1 hot‑swap supported (with sync module)

Key Features

Excitation‑Optimized Control: Integrates AVR, PSS, and field current regulation for generator stability.

High‑Speed Real‑Time Processing: 32‑bit PowerPC for complex algorithms and fast loop response.

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

Multi‑Protocol Connectivity: Dual Ethernet + fieldbus ports for seamless DCS/grid integration.

Harsh Environment Rated: Wide temperature and industrial certifications for power/heavy industry.

Application Scope

Generator static excitation systems (UNITROL 6000, PEC80)

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

Power plants (hydro/gas/steam turbines), metallurgy, chemical, oil & gas