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ABB PCD231B101 3BHE025541R0101

ABB PCD231B101 (3BHE025541R0101) is an ABB industrial control module used mainly in power generation excitation and control systems.

Basic identification

• Manufacturer: ABB
• Part number: PCD231B101
• Order code: 3BHE025541R0101
• Product family: AC 800PEC / excitation & power control platform
• Application area: Generator excitation / power system control / industrial automation

Main function

This module is typically used as an excitation system controller (or control processor unit) in synchronous generator systems. Its role includes:

• Regulating generator field excitation current
• Maintaining stable terminal voltage
• Supporting reactive power control (VAR control)
• Coordinating protection and control logic in power plants

System role

In ABB excitation systems (such as UNITROL / AC 800PEC-based systems), it acts as a core control board, working with:

• Thyristor power bridges (rectifiers)
• Voltage/current measurement modules
• Communication and protection I/O modules

Typical features

• High-speed digital control (DSP-based)
• Real-time voltage regulation loops
• Communication interfaces for system integration
• Fault monitoring and protection functions
• Designed for redundant/industrial-grade operation