Technical Specifications DC bus voltage sampling input, brake chopper driving output interface. Auxiliary power 24 V DC, typical power consumption 4.6 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Conformal coated printed circuit board.
Functional Features Samples DC bus real‑time voltage value. Outputs driving signal to activate brake chopper when over‑voltage condition occurs. Controls regenerative energy consumed by external brake resistor. On‑board LED displays working state and fault alarm information. Built‑in hardware self‑diagnosis detects sampling circuit and brake loop faults.
Application Scenarios Brake control spare part for ABB variable‑frequency drive. Mainly used for crane, hoist and high‑inertia load drive equipment maintenance.
Performance Parameters Rapid DC bus voltage sampling response. Stable brake chopper driving capability. Accurate over‑voltage threshold triggering performance.
Material Composition Multilayer glass‑fiber epoxy printed circuit board. Voltage sampling, logic judgment and driving assemblies. Conformal protective coating. High‑voltage sampling terminals and control signal connectors.
Structural Characteristics Cabinet fixed‑mount circuit board. Equipped with DC bus sampling terminals and multi‑group internal connectors. Reserved mechanical fixing holes. Weight approximately 0.45 kilogram.
Working Principle DC bus voltage signal is transmitted to BCU‑01 sampling circuit. Internal logic compares measured value with preset threshold. When over‑voltage happens, driving signal is sent to turn on brake chopper. Regenerative energy is released through brake resistor. Diagnosis circuit continuously monitors sampling and driving circuit operating condition.
Installation Requirements Fully disconnect converter main power and discharge high‑voltage capacitors before replacement. Secure BCU‑01 to designated cabinet mounting position. Complete DC bus sampling wiring and brake loop connection. Restore power supply, verify DC bus sampling value and dynamic braking test.
Usage Notes Comply with high‑voltage safety operation specifications. Match brake resistor parameters with drive unit rating. Apply anti‑static protection during handling. Complete deceleration braking function test after replacement.
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