Product Description:

The FS1W075P21 is a pulse-driven servo amplifier manufactured by Sanyo Denki for the F SANMOTION Servo Amplifiers series. It interfaces between a CNC, PLC, or standalone motion controller and a two-phase stepping motor, translating timed pulse trains into phased currents that advance the rotor by fixed increments. By combining compact packaging with open-loop positioning, the unit is installed in pick-and-place arms, light conveyors, and semiconductor indexing tables where moderate torque and precise incremental positioning are required.

In operation, the drive accepts pulses as narrow as 2 µs and enforces a minimum command interval of 50 µs, enabling high-speed sequencing without data overrun. The internal divider assigns a 0.72° basic step and can refine each step into as many as 250 microsteps for reduced vibration and finer resolution. A power stage capable of sourcing 4 A energizes the windings, while the 220 Ω input resistance limits the current drawn from TTL or differential line drivers. The monitor output advances in 7.2° increments, providing a coarse electrical position reference for diagnostic observation with an oscilloscope.

The amplifier housing measures 56 mm wide, 120 mm deep, and 160 mm high, so it fits between standard DIN-rail devices inside shallow enclosures. It weighs only 0.8 kg, allowing panel or rail mounting with minimal reinforcement. Vent slots on the sides provide convection cooling, so no fan is required, and the narrow form factor leaves clearance for wiring ducts inside crowded cabinets during panel refurbishment projects. Two 5 mm holes on a 105 mm pitch, tapped with M4 × 0.7 threads, align the aluminum base with the panel. Electrical isolation withstands 1500 VAC, and insulation resistance remains above 10 MΩ to protect low-voltage logic from the power stage.