Technical Specifications Multi‑channel analog sampling input interface, thyristor trigger pulse output terminals. Auxiliary control power 24 V DC, typical power consumption 5.4 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Conformal coated printed circuit board.
Functional Features Receives voltage and current transformer sampling signals from generator. Executes generator closed‑loop voltage regulation logic. Generates and outputs trigger pulse signals for thyristor rectifier unit. On‑board LED indicates regulation running status and hardware fault alarm information. Built‑in hardware self‑diagnosis detects sampling loop and pulse output circuit faults.
Application Scenarios Core regulation spare part for ABB generator static excitation system. Used for power plant generator excitation cabinet overhaul and hardware replacement.
Performance Parameters High‑precision generator voltage closed‑loop regulation. Fast response to generator load fluctuation. Stable long‑term continuous operating performance.
Material Composition Multilayer glass‑fiber epoxy printed circuit board. Signal conditioning, regulation algorithm processing and pulse generation assemblies. Conformal protective coating. External sampling signal terminals and internal plug‑in connectors.
Structural Characteristics Cabinet fixed‑mount circuit board. Equipped with multi‑group external sampling terminals and internal connectors. Reserved mechanical fixing holes. Weight approximately 0.53 kilogram.
Working Principle Generator voltage and current sampling signals are input for conditioning processing. Internal control circuit calculates regulation deviation according to set voltage value. Corresponding trigger pulse signals are generated and sent to thyristor rectifier unit.
Installation Requirements Fully cut off excitation cabinet main power and auxiliary control power before replacement. Fasten CMA123 to specified mounting position. Complete external transformer sampling wiring and internal connector connection. Restore power supply, perform signal calibration and generator voltage closed‑loop regulation test.
Usage Notes Strictly implement electrostatic protection requirements. Verify sampling signal polarity after installation. Avoid mechanical damage to conformal coating. Complete full excitation system function verification after board replacement.
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