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3BHE009949R0004、ABB UNS4881b,V4、AVR Control Module

Technical SpecificationsModel: UNS4881b,V4Part No:3BHE009949R0004Power Supply: 24V DC (15%), typical power consumption 7.2WApplicable System: ABB UNITROL 5000 static excitation sys
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Products Description
Technical Specifications

  • Model: UNS4881b,V4

  • Part No:3BHE009949R0004

  • Power Supply: 24V DC (±15%), typical power consumption 7.2W

  • Applicable System: ABB UNITROL 5000 static excitation system

  • Core Function: Generator voltage regulation, excitation closed‑loop control, limit & protection logic, fault diagnosis

  • Processor: 32‑bit high‑speed industrial microprocessor

  • Communication: Internal system bus, RS485, Modbus RTU protocol

  • Built‑in Protection: Over‑excitation, under‑excitation, over‑current, loss of field, voltage deviation protection

  • Isolation: 2kV AC galvanic isolation between field signal and control circuit

  • Operating Temperature: ‑5℃ ~ +60℃; Storage temperature:‑40℃ ~ +85℃

  • Humidity: 5%‑95% RH, non‑condensing

  • Protection Class: IP20 (cabinet internal installation)

  • Mounting: Rack plug‑in installation for UNITROL5000 excitation cabinet

  • Dimension: 335mm × 255mm ×30mm; Weight: approx 0.60kg

UNS4881b,V4 (3BHE009949R0004) is the main digital control board for ABB UNITROL5000 static excitation system, widely deployed for synchronous generators in thermal power, hydropower and industrial captive power plants.
This board executes core AVR regulation algorithm, stabilizes generator terminal voltage and reactive power output. It integrates multiple limit and protection functions to protect generator unit from abnormal operating conditions. It supports data communication with plant DCS system for remote monitoring, parameter setting and fault recording. Industrial‑grade hardware design adapts to strong electromagnetic interference environment in power plant cabinet. On‑board LED indicators show power, running status and fault alarm for convenient on‑site inspection and troubleshooting.
When replacing spare parts, verify full part number and hardware revision to ensure system compatibility. Complete power‑off and discharge operations before installation to avoid module burnout and excitation system malfunction. Suitable for on‑site fault replacement and long‑term spare‑part stocking of existing UNITROL5000 excitation equipment.


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