Mitsubishi HC-KFS73 MELSERVO J2S 750W Low‑Inertia AC Servo Motor

Mitsubishi Electric HC-KFS73 is a low‑inertia, small‑capacity AC servo motor from the MELSERVO J2S series for high‑response positioning applications. Rated output 750 W (0.75 kW) at 200 V AC class, 3‑phase. Straight shaft design with built‑in 17‑bit absolute encoder (131,072 pulses/revolution). IP55 enclosure. 80 mm × 80 mm flange mounting. Natural cooling. This product is discontinued and available as a spare part for maintaining existing MELSERVO J2S‑based systems.

Applications:

• High‑speed positioning in pick‑and‑place and assembly automation

• Belt drive systems and X‑Y tables

• Semiconductor manufacturing and electronics assembly equipment

• Packaging machinery, labeling systems, and material handling

• Legacy system spare part replacement for MELSEC‑J2S configurations

Core Specifications:

• Rated output power: 750 W (0.75 kW)

• Rated torque: 2.4 N·m

• Maximum torque: 7.2 N·m (instantaneous)

• Rated current: 5.8 A

• Maximum current: 18.6 A

• Rated rotational speed: 3,000 rpm

• Maximum rotational speed: 4,500 rpm

• Moment of inertia: refer to manufacturer technical data

• Encoder: 17‑bit absolute/incremental encoder (131,072 pulses/revolution)

• Shaft type: Straight shaft (standard)

• Flange mounting: 80 mm × 80 mm

• Protection rating: IP55 (dust‑protected and jet‑water resistant)

• Cooling method: Natural cooling (fanless)

• Insulation class: Class B

• Weight: approx. 3.0 kg

Advanced Specifications:

• Power rate at continuous rated torque: 37.7 kW/s

• Vibration level: V10

• Permissible instantaneous speed: 5,175 rpm

• Ambient operating temperature: 0 °C … 40 °C

System Integration:

• This servo motor belongs to the Mitsubishi Electric MELSERVO J2‑Super series.

• Compatible servo amplifiers: MR‑J2S‑70A (pulse train interface), MR‑J2S‑70B (SSCNET III/H interface). Also compatible with MR‑J3‑70A, MR‑J3‑70B when configured for J2S compatibility mode.

• For absolute position retention during power‑off, an external battery (MR‑BAT6V1SET) is required.

• For detailed installation, wiring, connector pinout, and parameter setting, refer to the MELSERVO J2S series Instruction Manual.

Standards & Compliance:
Refer to manufacturer official documentation for certification and compliance details.

Related Products:

• MR‑J2S‑70A – J2S series servo amplifier, 750 W (universal interface)

• MR‑J2S‑70B – J2S series servo amplifier, 750 W (SSCNET III/H)

• MR‑BAT6V1SET – Battery for absolute encoder

• MR‑BKS1CBL□M‑A1‑L – Brake cable for motor with brake (order separately, length optional)

• MR‑PWS1CBL2M‑A1 – Power cable, 2 m (standard bending life)

• MR‑J3ENCBL2M‑A1 – Encoder cable, 2 m (standard bending life)