ABB

1.Main Functions

High‑precision multi‑channel analog signal acquisition for generator excitation system, samples generator terminal voltage, excitation current, rotor current and temperature analog signals, converts analog field signals into digital data for main controller processing.
Equipped with 32‑bit RISC processor and onboard flash memory, stores system configuration parameters, operation logs and excitation‑system fault event records.
Realizes high‑speed backplane bus data interaction with UNITROL main CPU board, transmits measured real‑time data, alarm status and fault information to upper‑level control unit.
Provides signal galvanic isolation between high‑voltage power‑circuit side and low‑voltage control circuit, improves anti‑interference performance for power‑plant harsh electromagnetic environment.
Built‑in hardware self‑diagnosis function, detects channel over‑range, board hardware failure and signal‑loop abnormality, generates corresponding fault codes for troubleshooting.
Supports standard industrial 24 VDC power supply; operating temperature range:‑20 ℃ ~ +60 ℃, meets EMC anti‑interference standard IEC 61000‑4 for power‑generation site cabinet installation.
Delivers accurate measurement data for automatic voltage regulator (AVR) closed‑loop adjustment, supports generator excitation limit protection logic trigger.

ABB 3BHE009319R0001 Control Board

Core measuring‑interface board for ABB UNITROL 5000 series generator excitation systems, widely deployed in thermal power, hydropower and other power‑plant generator sets.
Responsible for sampling key generator electrical parameters, provides measurement basis for AVR voltage regulation and excitation‑system protection.plcva.com
Applied for maintenance replacement of existing running excitation cabinets; it is legacy OEM spare‑part, not recommended for new‑project construction.
Cooperates with CPU board, power supply board and other accessory boards inside UNITROL rack; cannot work independently without complete rack hardware.
Transmits measurement data to DCS/PLC system for remote monitoring of generator operating conditions.