Mitsubishi HC-KFS43 MELSERVO J2S 400W AC Servo Motor IP55 Straight Shaft

Mitsubishi Electric HC-KFS43 is a low‑inertia AC servo motor from the MELSERVO J2S series for industrial motion control applications. Rated output 400 W at 200 V AC class (3‑phase). Straight shaft design with built‑in 17‑bit absolute encoder (131,072 pulses/revolution). IP55 enclosure for dust‑protected and water‑jet resistant operation.

Applications:

• Belt drive and robotic motion systems

• Assembly machines, X‑Y tables and CNC positioning

• Food manufacturing machinery and semiconductor processing equipment

• Textile and packaging machinery

Technical Specifications:

Core Specifications

• Motor type: Low‑inertia, small‑capacity AC servo motor (brushless synchronous)

• Rated output power: 400 W (0.4 kW)

• Rated current: 2.3 A

• Supply voltage: 200 V AC class (3‑phase)

• Rated torque: 1.3 N·m

• Maximum torque: 3.8 N·m

• Rated rotational speed: 3,000 rpm

• Maximum rotational speed: 4,500 rpm

• Moment of inertia: 0.0000460 kg·m² (0.46 kg·cm²)

Advanced Specifications

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

• Resolution: 17‑bit (131,072 pulses/revolution)

• Encoder type: Built‑in absolute feedback encoder (no battery for incremental mode; battery required for absolute position retention)

• Shaft type: Straight shaft (standard)

• Flange mounting: 60 mm × 60 mm

• Protection rating: IP55 (excluding shaft through‑hole and connector)

• Cooling method: Natural cooling (fanless)

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

• Storage temperature: –15 °C … +70 °C

• Dimensions (H × W × D): 72.8 mm × 62 mm × 154.5 mm

• Weight: approx. 1.2 kg

Product Status:
Discontinued. Available as a spare part for maintaining existing MELSERVO J2S‑based systems.

Compatibility information:

• This motor belongs to the Mitsubishi Electric MELSERVO J2S series.

• Compatible servo amplifiers: MR‑J2S‑40A (pulse train interface), MR‑J2S‑40B (SSCNET interface), and MR‑J4‑40B (J3 compatibility mode).

• Designed for MR‑J2S‑40A (400 W, 200‑230 V AC, single/three‑phase input) or MR‑J4‑40B (400 W, 200‑240 V AC, SSCNET III/H interface).

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

Related Products:

• MR‑J2S‑40A – J2S series servo amplifier (pulse train interface)

• MR‑J4‑40B – J4 series servo amplifier (SSCNET III/H interface, recommended replacement for new designs)

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

• MR‑BTBLCBL02M‑B – Dynamic brake cable (external use)

• MR‑BKS1CBL03M‑A – Battery cable for absolute encoder