Mitsubishi SF-PW Logic Power Supply Unit for FR-SF Series Spindle Drives

The Mitsubishi SF-PW (SF-PW) is a logic power supply unit intended for FR-SF series spindle drives in CNC systems. It is the power supply assembly used for the logic power path in the spindle drive system, supporting the control electronics rather than the main motor power stage. The unit also appears under the SFPW abbreviation in listings and service references, and it is identified as discontinued by the manufacturer. For replacement planning, the current product record directs users to the SF-PW30 (U543) as the successor or transfer reference. The SF-PW is associated with Mitsubishi FR-SF spindle drive installations, making it relevant to maintenance and repair of older CNC spindle systems. Its role as a logic supply makes it a service part for drive cabinets where the control section requires a dedicated power source. Available evidence does not confirm output voltage, connector type, enclosure dimensions, or net weight, so those specifications should be verified against the machine documentation before ordering. This listing covers the SF-PW power supply unit and is intended for repair, replacement, and spare-parts identification.