Description
📌 FANUC A20B‑8100‑0721 — Power Supply PCB / DC‑DC Converter Module
Description:
The FANUC A20B‑8100‑0721 is a power supply printed circuit board (PCB) used in various FANUC CNC control systems, particularly i‑Series modular controllers (e.g., 16i, 18i, 21i and similar models). It provides regulated DC power to other control electronics by converting voltage levels from the main supply to the specific low‑voltage DC required by internal circuitry.
Key Functions & Characteristics:
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🔌 Power Supply PCB: Acts as a DC‑DC converter / auxiliary power module that feeds stable DC power to control boards (CPU, memory, I/O, display, servo interface, etc.).
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⚡ Voltage Conversion: Typically bolts onto or integrates with the main controller board and performs step‑down conversion from incoming CNC supply to internal logic voltages.
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🧰 Used In: Most commonly installed in FANUC i‑Series controllers (modular 16i, 18i, 21i families), where modular power boards are separate from the main control CPU.
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📍 Physical Form: PCB module rather than a standalone power supply unit — often small and designed to interface directly with the controller backplane or main board.
Typical Applications:
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Provides power for internal electronics in CNC systems — essential for normal controller operation.
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Used where a separate replaceable power supply board was designed instead of fully integrated PSU sections.