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CNC Power Supply Unit – MITSUBISHI SF-PW
The SF-PW is a CNC power supply unit (“CNC Power Supply Unit”) manufactured by Mitsubishi Electric, designed to provide regulated DC supply voltages to the internal boards of MELDAS-series and related CNC numerical control systems. The unit converts mains AC voltage into multiple regulated DC outputs (+5 V, ±12 V, ±15 V, +24 V typically) required by control logic, interfaces and axis boards. The commercial part number is SF-PW (internal article code: SFPW).
The power supply is the energy core of the CNC system: without stable, well-regulated voltages the entire control unit cannot operate. A failure typically manifests as inability to power on, voltage-out-of-range alarms, spontaneous resets, or secondary damage to downstream boards. Replacement or repair of this unit is often the first diagnostic step in the event of complete machine downtime.
Mitsubishi Electric is one of the world’s leading manufacturers of CNC systems, servo and spindle drives, and industrial automation. The FA (Factory Automation) division produces numerical controllers from the MELDAS series up to the modern M800/M80 platforms. Products from legacy series such as MELDAS are to be considered legacy / discontinued as new parts: available primarily as used, surplus or through specialist repair.
Main Technical Specifications
| Type | CNC power supply unit |
| Part number | SF-PW (SFPW) |
| Brand | Mitsubishi Electric |
| Known application | Mitsubishi CNC MELDAS series and M series (machining centres, CNC lathes) |
| Function | Multi-output regulated power supply for CNC control boards |
| Input voltage | 100–240 V AC, 50/60 Hz (typical) |
| Output voltages | +5 V, ±12 V, ±15 V, +24 V DC |
| Interfaces | Edge / board connectors and terminal strips to CNC backplane |
| Protections | Overvoltage, overcurrent, short-circuit, over-temperature (typical) |
| Weight | ~0.8–2.0 kg |
| Dimensions | ~150–260 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |