Products Description
ABB UNS4881b,V4 3BHE009949R0004 Interface Board in stock
ABB UNS4881b,V4 (3BHE009949R0004) is a communication and signal interface board designed for ABB UNITROL generator excitation control system. It handles external analog and discrete signal exchange between the excitation controller and plant DCS, protection relays and local HMI panels.
This board integrates signal conditioning, electrical isolation and serial communication circuits. Version V4 is the upgraded revision with improved EMC performance and signal stability, widely used as spare for power station excitation cabinet overhaul and replacement.
Main Specifications
| No. | Item | Parameter |
|---|---|---|
| 1 | Brand | ABB |
| 2 | Model | UNS4881b,V4, 3BHE009949R0004 |
| 3 | Module Type | Signal & Communication Interface Board |
| 4 | System Platform | ABB UNITROL Generator Excitation System |
| 5 | Signal Type | 4-20mA analog, binary digital input/output signals |
| 6 | Version | V4 hardware revision, enhanced EMC protection |
| 7 | Backplane | Plug-in backplane connection with main processor |
| 8 | Operating Temperature | -25℃ ~ +55℃ |
Core Functions
| No. | Function Description |
|---|---|
| 1 | Transmit analog setpoint and feedback signals between excitation unit and DCS system |
| 2 | Receive interlock, start/stop and breaker status discrete signals from field |
| 3 | Isolate external field signals to avoid interference damaging the main CPU board |
| 4 | Upload excitation alarms, events and operating status to upper monitoring system |
| 5 | Onboard self-diagnosis and LED indicators for fast signal fault troubleshooting |
Application Scenarios
| No. | Application |
|---|---|
| 1 | Power plant UNITROL generator excitation control cabinet |
| 2 | Thermal power and hydroelectric generator excitation regulation system |
| 3 | Signal interface between excitation controller and plant DCS/SCADA |
| 4 | Generator protection interlock signal exchange for excitation system |
| 5 | ABB UNITROL series spare parts replacement and cabinet maintenance |
FAQ
| No. | Question & Answer |
|---|---|
| 1 | Q:What is ABB UNS4881b,V4 3BHE009949R0004? A:It is a signal and communication interface board for UNITROL excitation system. It transfers analog and digital signals between the excitation controller and DCS, while providing electrical isolation for signal protection. |
| 2 | Q:What is the upgrade of V4 version? A:V4 revision optimizes hardware circuit and EMC anti-interference capability, improving stability in noisy power cabinet environment, and is backward compatible with older UNITROL racks. |
| 3 | Q:Which modules work with UNS4881b,V4? A:It works together with PPC902AE processor board, UFC718AE and UFC721BE trigger boards to form the complete UNITROL excitation control unit. |
