Technical Specifications Multi‑channel current signal input, isolated data output to back‑plane bus. Auxiliary power 24 V DC, typical power consumption 6.1 W. Operating temperature ‑10 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Conformal coated circuit board, signal isolation voltage 1900 V AC.
Functional Features Acquires current sampling signals from power circuit. Completes signal filtering, conditioning and galvanic isolation. Transmits processed current feedback data to main controller through back‑plane bus. On‑board LED indicates signal channel status. Built‑in hardware self‑diagnosis detects signal loop breakage and short‑circuit faults.
Application Scenarios Spare‑part for ABB thyristor rectifier and DC drive equipment. Used for industrial power conversion equipment maintenance and spare‑part replacement.
Performance Parameters High‑fidelity signal conditioning guarantees current measurement precision. Galvanic isolation suppresses high‑voltage interference from power loop. Self‑diagnosis gives clear alarm for signal‑loop failures.
Material Composition Multilayer glass‑fiber epoxy printed circuit board. Current signal conditioning and optocoupler isolation assemblies. Conformal protective coating. Back‑plane plug‑in connectors and field signal input terminals.
Structural Characteristics Plug‑in circuit board matching cabinet rack slot. Board edge equipped with back‑plane bus connector and current‑signal input terminals. Reserved mechanical fixing holes. Weight approximately 0.62 kilogram.
Working Principle After power‑on, the board completes hardware self‑initialization. Current sampling signals enter through field input terminals. Signals go through filtering, conditioning and galvanic‑isolation processing. Valid feedback data is transmitted to main controller over back‑plane bus. Internal diagnosis circuit monitors real‑time status of each signal channel.
Installation Requirements Disconnect cabinet high‑voltage power and auxiliary power before replacement. Insert 3ASC25H204 into designated slot and tighten fixing screws. Confirm back‑plane connector is fully engaged. Complete field sampling signal wiring. Restore power supply and calibrate current sampling accuracy.
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