Technical Specifications DC‑bus voltage sampling input, brake power device drive output interface. Auxiliary working power supplied by converter auxiliary power. Operating temperature 0 ℃ to +70 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Built‑in over‑voltage threshold comparison circuit.
Functional Features Samples real‑time DC‑bus voltage value of frequency converter. Compares measured voltage with preset brake threshold. Outputs drive signal to brake chopper power component when over‑voltage occurs. Realizes energy consumption braking through brake resistor. On‑board indicator lamp displays brake working and fault status.
Application Scenarios Spare brake chopper control board for ABB industrial frequency converter. Applied in lifting and material‑handling drive equipment maintenance requiring frequent deceleration braking.
Performance Parameters Fast DC‑bus over‑voltage detection response. Stable brake chopper drive output performance. Reliable over‑voltage suppression capability.
Material Composition Multilayer glass‑fiber epoxy printed circuit board. Voltage sampling, threshold comparison and drive output assemblies. Signal connectors and metal fixing hardware. Conformal protective coating on circuit surface.
Structural Characteristics Rectangular circuit board structure. High‑voltage sampling input connector and brake drive output connector distributed on board edges. Screw mounting holes for cabinet fastening.
Working Principle NBRA669C continuously samples DC‑bus voltage signal. When voltage rises above brake threshold, internal circuit outputs drive signal to turn‑on brake chopper power device, excess energy is consumed on brake resistor. When DC‑bus voltage drops below threshold, chopper is turned off.
Installation Requirements Cut off frequency converter main power and auxiliary power, wait for DC‑bus capacitor full discharge before replacement. Wear anti‑static wrist strap. Fasten NBRA669C to cabinet mounting position. Insert all sampling and drive connectors completely. Restore power supply, execute drive deceleration test and verify brake chopper working condition.
Usage Notes Confirm brake resistor parameter matches board threshold setting. Hot‑plug under powered state is prohibited. Check DC‑bus voltage fluctuation during deceleration after commissioning.
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