Mitsubishi SF-TL PCB Circuit Board for FR-SF Spindle Drive BN624A961G52A

The Mitsubishi BN624A961G52A (SF-TL) is a printed circuit board assembly and option card designed for Mitsubishi FREQROL-SF spindle drives and M300 series CNC systems. It is identified in service documentation as the SF-TL card, with part number BN624A961G52A and the related designation BN624A961G52. In the drive, the board supports spindle functions such as high-speed synchronous tapping and spindle orientation, including C-axis control using a magnetic sensor. The card communicates with the NC through cable connectors CN1A and CN1B, and it includes a rotary switch CS1 whose setting must match the required configuration. Because the SF-TL board is part of the spindle control path, correct seating of the card and secure connection of its cable connectors are important during installation and troubleshooting. It is used in CNC machining and spindle applications where coordinated spindle positioning, orientation, or synchronous tapping is required.