Fanuc Series20 A20B-1003-0090 retrofit module

The Fanuc A20B-1003-0090 is a digital AC servo control board of the S-Series. It performs digital regulation and control of AC servo drives, making it a central component in the drive architecture of CNC systems. As a single-channel control board, it manages signal processing between the CNC controller and the respective servo motor. The board is designed for use in AC servo drives of the 0S to 30S series as well as 3000-series variations of drives and motors. It is installed in servo units used in CNC machines and related industrial equipment featuring Fanuc drive technology of the 6058 series. The board is an integral part of the drive concept of this servo drive generation and works closely with the power section of the respective drive unit. The A20B-1003-0090 is distinguished by its design as a digital servo control unit, enabling precise and reliable regulation of connected AC servo motors. Typical fault patterns with this board can affect both the control board itself and the power section of the drive, which is why a diagnosis of the entire servo drive system is recommended. The component is designed for use in demanding industrial environments.