Technical Specifications Mixed tachogenerator analog and encoder pulse signal input. Auxiliary power 24 V DC, typical power consumption 5.9 W. Operating temperature ‑10 ℃ to +55 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Conformal coated circuit board, isolation voltage 1600 V AC.
Functional Features Supports tachogenerator analog speed signal and incremental encoder pulse signal input. Completes signal filtering, shaping and galvanic isolation. Transmits motor speed feedback data to drive main controller via back‑plane bus. On‑board LED reflects signal channel operating status. Built‑in hardware self‑diagnosis detects feedback signal loss and loop faults.
Application Scenarios Key replacement spare‑part for ABB industrial DC drive units. Applied in rolling mill, metallurgy and papermaking production line equipment maintenance.
Performance Parameters High‑precision signal processing ensures motor speed detection accuracy. Strong anti‑interference capability for field feedback signals. Self‑diagnosis rapidly captures feedback signal interruption faults.
Material Composition Multilayer glass‑fiber epoxy printed circuit board. Analog and pulse signal conditioning assemblies, optocoupler isolation components. Conformal protective coating. Back‑plane plug‑in connectors and motor‑side signal wiring terminals.
Structural Characteristics Standard plug‑in circuit board matching DC drive rack slot. Board edge equipped with back‑plane bus connector and speed‑feedback signal terminals. Reserved mechanical fixing holes. Weight approximately 0.60 kilogram.
Working Principle After power‑on, board completes hardware self‑check. Analog tachogenerator signal or encoder pulse signal enters the board from motor side. Signals pass through filtering, shaping and isolation processing.
Installation Requirements Cut off drive unit main power and control power before replacement. Insert 3ASC25H209 into corresponding slot and tighten fixing screws. Confirm back‑plane connector is fully locked. Complete motor feedback signal wiring. Restore power supply and verify motor speed closed‑loop performance.
Usage Notes Use shielded cable for motor speed feedback wiring. Separate signal cable from high‑power power cable.
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