Mitsubishi SF-CA PCB Control/Converter Board for FR-SF Spindle Drives

The Mitsubishi SF-CA (SF-CA) is a printed circuit board and control/converter card used in Mitsubishi FR-SF spindle drive systems, including MELDAS-family CNC machining centers. It mounts within the FR-SF modular spindle amplifier and mates with the SF-PW power supply through a multi-pin card-edge connector. Through this interface, the board carries high-current gate-drive return paths, DC bus voltage sensing for under-voltage and over-voltage protection, IGBT desaturation fault signals, and auxiliary logic rails. The SF-CA converter section is associated with the drive's regenerative front end and phase-loss detection, including input-phase alarm handling. The board is used in troubleshooting and repair of FR-SF spindle drives, where a missing LED display or intermittent spindle alarms can point to the SF-CA card or its card-edge connection. Current product information flags the item as obsolete and notes SF-CA/SF-CAA (PCB-00008) as a use/transfer reference. It is intended for maintenance, repair, and replacement of Mitsubishi FR-SF drive assemblies rather than for standalone use.