Description
Product Overview
ABB 3BHE004573R0145, also marked UFC760BE145, is a phase modulator / INU-INT interface PCB designed for ABB UNITROL 6000 generator static excitation system. It receives firing reference commands from the main controller, generates and modulates precise phase trigger pulses for SCR thyristor rectifier bridges. The board also collects power circuit feedback signals for excitation closed-loop regulation, grid synchronisation and rectifier protection. Widely deployed in thermal, hydro and gas turbine power plants, it serves as critical legacy spare parts for UNITROL 6000 excitation cabinet maintenance and retrofit projects.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | 3BHE004573R0145 |
| Alternate Model | UFC760BE145 |
| Brand | ABB |
| Type | Phase Modulator Interface Board (INU-INT) |
| Compatible Platform | ABB UNITROL 6000 Excitation System |
| Function | SCR firing pulse generation, phase angle modulation, rectifier signal feedback |
| Power Supply | Powered by UNITROL 6000 rack backplane |
| Operating Temperature | 0°C ~ +60°C |
| Storage Temperature | -40°C ~ +70°C |
| Humidity | 5~95% RH, non-condensing |
| Mounting | Plug-in subrack card for UNITROL rack |
| Net Weight | ~0.45 kg |
| Certifications | CE, IEC power electronic standards |
| Product Status | OEM discontinued, aftermarket legacy spare |
Key Features
- High-precision phase modulation and SCR firing pulse output for excitation rectifier control
- Captures rectifier voltage/current feedback signals and feeds back to main excitation controller
- High-speed signal processing to reduce harmonic distortion and stabilise generator excitation output
- Built-in hardware diagnostics for pulse fault, signal loss and board health monitoring
- Front panel LED indicators for power status, pulse activity and fault alarms
- Rugged PCB construction suitable for high-vibration, high EMI power plant cabinet environments
- Works cooperatively with UNITROL 6000 main processor boards for complete excitation regulation
Installation & Testing Notes
- Insert UFC760BE145 into the dedicated slot of UNITROL 6000 excitation rack
- Connect backplane bus cables and SCR pulse wiring strictly following excitation schematic diagrams
- Verify cabinet protective grounding before energizing high power rectifier circuit
- After power-up, check front LED indicators and execute board self-test via excitation HMI
- Perform static pulse test to validate each thyristor gate trigger signal
- This board does NOT support hot swap. Isolate both control power and high voltage excitation power before removal
- After replacement, conduct no-load excitation commissioning and monitor rectifier operating status
- Periodically inspect connector tightness in high vibration turbine cabinet environments
FAQ
Q: What system is 3BHE004573R0145 used for? A: ABB UNITROL 6000 generator static excitation system.
Q: What is the alternate part name? A: UFC760BE145, INU-INT phase modulator board.
Q: What is its core function? A: Generate and modulate SCR firing pulses for excitation rectifier bridge, collect rectifier feedback signals.
Q: Is 3BHE004573R0145 hot swappable? A: No, all high voltage excitation power and control supply must be fully isolated before replacing the board.
Q: What role does it play in excitation cabinet? A: It converts digital control commands into analog firing pulses to control the thyristor rectifier bridge of UNITROL6000.
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