ABB FM9925A‑E HIEE45116R0001 Feedback Measuring Board

The ABB FM9925A‑E (HIEE45116R0001) is a high‑precision feedback measuring board for ABB UNITROL generator excitation systems. It samples generator voltage, current and other analog feedback signals, and transmits processed data to main controller for closed‑loop excitation regulation.

This measuring board adopts galvanic isolation design to suppress electromagnetic interference from power plant sites. It is a critical spare component for maintenance and retrofitting of ABB UNITROL series excitation control cabinets.

Main Specifications

Brand: ABB; Model: FM9925A‑E; Part No.: HIEE45116R0001; Type: Feedback Measuring Board
Applicable System: UNITROL series generator excitation control platform
Function: Multi‑channel analog signal acquisition, filtering and data transmission
Feature: Galvanic isolation, high measuring accuracy for power‑generation equipment
Installation: Rack‑mounted inside generator excitation control cabinet
Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing
Certifications: CE, compliant with power automation equipment standards

Core Functions

Collect real‑time voltage and current feedback signals from synchronous generator.
Complete signal filtering and analog‑digital conversion for high‑precision measurement.
Send sampled data to main control board for automatic voltage closed‑loop regulation.
Isolation circuit protects control system from surge and common‑mode interference.
Support signal abnormality detection for equipment fault diagnosis and alarm output.
Modular rack‑mount structure supports quick replacement for on‑site overhaul work.

Application Scenarios

Excitation cabinets for thermal power, hydropower and industrial co‑generation plants.
Signal feedback units for synchronous generator automatic voltage regulation system.
Retrofit and spare replacement of legacy ABB UNITROL power automation platforms.
Preventive maintenance and fault repair projects for power‑generation control equipment.
Spare parts inventory for power automation integrators and engineering contractors.
Global aftermarket spare supply for technical teams maintaining ABB generator hardware.