ABB UNS2880A-P 3BHB005727R0001 Excitation main control board

Brand: ABB
Model: UNS2880A-P, Version V1
Material Order Number: 3BHB005727R0001
Product Type: UNITROL Series Excitation System COB Central Main Control Board
Origin: Sweden
Compatible System: ABB UNITROL 1000, UNITROL 1010, UNITROL 1020 Generator Excitation Control System

Core Functions
Core Computing and Control Unit of the Excitation System
As the main control core of the entire excitation regulator, it realizes automatic voltage regulation by AVR, reactive power regulation, and closed-loop control of power factor, and completes precise closed-loop computing and control of generator excitation current, stator voltage, and reactive power.
Signal Acquisition and Logic Interlock Processing
Receive analog quantity signals such as voltage, current, frequency, and speed collected by the UNS2881A-P measurement board, complete fault logic judgment, over-excitation, under-excitation, overcurrent, loss of excitation, low-frequency protection logic operations, and output trip, alarm, and restriction instructions.
Switching of Multiple Circuit Control Modes
Support automatic/manual excitation dual mode without disturbance switching, constant voltage/constant reactive power/constant power factor multiple regulation methods, and possess standard excitation control functions such as soft starting excitation, inverter disconnection, fault reduced excitation, etc.
System Communication and Data Interaction
Board-mounted high-speed backplane bus, real-time data interaction with measurement board, rectifier interface board, and display panel
Support Profibus, RS485, etc. industrial buses, connect to power plant DCS/PLC system, upload telemetry, telemetry, fault SOE events, receive remote regulation instructions
Local Debugging Interface, used for parameter loading, fault recording, event log reading, firmware upgrade
Fault Storage and System Self-Diagnosis
Can save fault waveforms and action event records, with fault data remaining for approximately 48 hours after power loss; real-time monitoring of board card, power supply, communication, and acquisition channel status, actively sending alarm information for abnormal conditions, facilitating fault traceability and troubleshooting.

Hardware and Environmental Parameters
Power Supply: DC power supply from the backplane of the excitation system frame
Installation Method: Standard rack slot installation, can be combined and used with MUB measurement board, FTO interface board
Operating Temperature: 0℃～+60℃; Storage Temperature: -40℃～+85℃
Environmental Humidity: 5%～95% RH (no condensation)
Protection Grade: IP20 (installed in the control cabinet)
Net Weight: Approximately 0.44kg

Complementary Board Card Combinations
UNS2880A-P (3BHB005727R0001): COB Main Control Board (Computation + Logic + Communication)
UNS2881A-P: MUB Voltage and Current Measurement Acquisition Board
UNS0883A-P: FTO Rectifier Interface Board
UNS0885A-Z: CDP Local Operation and Display Panel

Typical Application Scenarios
Excitation System Main Control Components for Steam Turbine Generators, Hydro Turbine Generators in Thermal Power Plants, Hydropower Plants, Biomass Power Plants
Modification of UNITROL Series Excitation Devices and Spare Parts Replacement for Self-Provided Power Plants in Steel and Chemical Industries
Excitation Voltage Regulation Control System for Diesel Generators, Gas Turbine Generators
Fault Repair and Capacity Expansion/Upgrade of Old UNITROL 1000/1010/1020 Excitation Systems