Description
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BrandABB
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ModelUFC921 A101
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Product NameINT-2 Conformal Coated Interface Control Board
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Country of OriginSweden
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HS Code85049099
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Dimensions234mm L× 112.5mm W× 27mm
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Weight0.34kg
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Operating Temperature-20°C ~ +60°C
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Storage Temperature-40°C ~ +85°C
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Part Number3BHE024855R1101
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Warranty12 month
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Product StatusNew and original
ABB UFC921 A101 3BHE024855R1101 INT-2 Varnished Interface Control Board
Electrical Parameters: Power Supply & CurrentRated Operating Power Supply: 24VDC ±10% industrial control power
Typical Operating Current: 280mA @ 24VDC
Maximum Peak Current: 350mA
Power Consumption: Max 8.4W
Signal Isolation Withstand Voltage: 1500V AC between analog channels & power ground
Analog Signal Input Range: 0~±10V AC generator voltage sampling, 0~5A CT secondary current signal
Pulse Output: Thyristor trigger pulse for three-phase rectifier bridge
Communication Interface: Backplane bus interface + terminal block for RS485 field bus
ABB UFC921 A101 3BHE024855R1101 Core Product Advantages
1. Exclusive matching for UNITROL 5000 excitation system, realizes high-precision generator voltage regulation with regulation accuracy ≤ ±0.5%, effectively stabilizing generator terminal voltage and reactive power output.
2. Full-board conformal varnish coating greatly improves environmental adaptability, resisting dust, moisture, corrosive gas and salt fog in power plant on-site cabinet environment, extending service life significantly.
3. Integrated multi-channel analog acquisition, logic control, pulse drive and fault diagnosis functions in one single board, highly integrated structure reduces system wiring and fault points.
4. Complete built-in protection logic: over-excitation, under-excitation, overcurrent, loss of excitation, PT fuse failure, rectifier bridge fault self-detection and trip interlock output.
5. Stable backplane bus docking structure, supporting hot-swap maintenance under system standby state, minimizing unit overhaul downtime.
6. Standardized terminal block layout, marked pin definition, convenient on-site debugging, signal measurement and fault troubleshooting; reserved test detection points for maintenance engineers.
7. Strict ABB industrial EMC certification, strong anti-electromagnetic interference capacity, stable operation under strong magnetic interference environment of power plant high-voltage equipment.
ABB UFC921 A101 3BHE024855R1101 Detailed Wiring Instruction
1. Main 24VDC Power Supply Wiring
Positive terminal: Connect +24VDC output of cabinet stabilized power supply module
Negative terminal: Access control cabinet DC common negative busbar
PE protective ground terminal: Firmly connect to cabinet equipotential grounding copper bar to eliminate power frequency interference and surge impact
Recommended cable: 18–22AWG shielded twisted wire for control power circuit
2. Generator Sampling Analog Signal Wiring
Two groups of external CT current & PT voltage sampling signals access independent terminal blocks:
PT Voltage Input Terminals: Connect secondary side output of generator voltage transformer, input 0~10V AC voltage feedback signal for AVR regulation calculation
CT Current Input Terminals: Connect secondary circuit of generator current transformer, transmit stator current sampling signal for reactive power calculation
Note: Current transformer secondary circuit must not be open-circuited during wiring operation to avoid high voltage danger.
3. Thyristor Trigger Pulse Output Wiring
Special orange plug terminal block outputs drive pulses to three-phase silicon controlled rectifier bridge power unit:
Each phase trigger signal corresponds to independent terminal pins, wiring in strict accordance with phase sequence label on PCB board; shielded cable single-end grounding is required for pulse line to prevent signal distortion.
4. Fault Alarm & Interlock Signal Wiring
Digital DI/DO terminal groups:
Digital Input Terminals: External protection interlock signals, breaker status, cabinet door switch signals
Digital Output Terminals: Fault relay output, trip command, alarm signal to DCS/SCADA monitoring system
