ABB PCD231B 3BHE025541R0101 Excitation Control Board

Technical Specifications

Model: PCD231B

Part Number: 3BHE025541R0101

Brand: ABB

Product Type: Excitation multi‑function I/O control board

Matching System: ABB AC800PEC control platform, UNITROL series generator excitation system

Power Supply: System backplane 24VDC power supply

Analog Input: Multi‑channel voltage and current sampling input

Analog Output: Analog regulating signal output for excitation loop

Digital Input: Multiple binary signal acquisition channels

Digital Output: Relay and level control output channels

Communication Interface: Internal high‑speed backplane bus interface

Installation Method: Rack plug‑in card installation

Operating Temperature: 0℃ ~ +60℃, non‑condensing

Protection Class: IP20

Weight: 0.78kg

Dimension: 245mm × 120mm × 40mm

Compatible System: ABB AC800PEC, UNITROL 5000‑6000 generator excitation system

Core Function: Complete sampling of generator side voltage, current and switch signals, output regulating control signals for excitation regulator, realize signal conditioning and transmission for excitation closed‑loop control.

Product Details

The PCD231B 3BHE025541R0101 is multi‑function I/O control board for ABB AC800PEC and UNITROL generator excitation system.

This PCD231B board undertakes key signal acquisition and signal output work inside the excitation cabinet.

It collects generator operating analog quantities and switch status signals, converts and transmits effective signals to main controller through internal backplane bus.

It outputs corresponding adjusting signals to cooperate with the thyristor power unit, to realize stable closed‑loop excitation regulation.

Front‑panel LED status indicators reflect power‑on condition, channel working status and back‑plane bus communication state.

Built‑in hardware self‑diagnosis function can detect channel over‑range, signal abnormality and board hardware failure, fault alarm information can be uploaded to upper monitoring system.

Industrial‑grade circuit design provides excellent anti‑interference performance for complex power plant cabinet environment.

Adopt standard rack plug‑in installation. Widely applied in thermal power and hydropower generator excitation reconstruction projects.

It is important spare hardware for UNITROL excitation system maintenance, signal channel debugging and defective PCD231B board replacement.