Mitsubishi HF-SP524 | MELSERVO-J3 AC Servo Motor
Part Number: HF-SP524
Brand: Mitsubishi Electric
Series: MELSERVO-J3 -- HF-SP Type
Condition: New / Refurbished
Overview
The Mitsubishi HF-SP524 is a 500W AC brushless servo motor from Mitsubishi Electric's MELSERVO-J3 series. This medium-inertia, medium-power motor features a 400VAC configuration and is engineered for precision feed axis and positioning applications in material handling systems, industrial robots, and multi-axis automation equipment.
Rated at 2.39 Nm continuous torque with 7.16 Nm peak capability, this motor operates at 2,000 RPM rated speed with a maximum of 3,000 RPM. The built-in 18-bit absolute encoder provides exact position knowledge, while IP67 environmental sealing ensures long-term durability in demanding industrial environments.
Key Specifications
| Rated Output |
500 W (0.5 kW) |
| Rated Torque |
2.39 Nm |
| Maximum Torque |
7.16 Nm |
| Rated Current |
1.5 A |
| Supply Voltage |
400VAC Class (3-Phase) |
| Rated Speed |
2,000 RPM |
| Maximum Speed |
3,000 RPM |
| Encoder |
18-Bit Absolute (built-in) |
| Shaft Type |
Straight Shaft |
| Holding Brake |
None (standard) |
| Ingress Protection |
IP67 (housing) |
| Flange Size |
130 × 130 mm |
| Compatible Amplifier |
MR-J3-60A4 / MR-J3-60B4 |
| Operating Temperature |
0 to +40°C |
| Series |
MELSERVO-J3 -- HF-SP |
400V Operation Advantages
The "24" suffix indicates this is the 400VAC variant of the HF-SP 500W motor. Operating at 1.5A rated current compared to 2.9A for 200V equivalents, this motor provides significant installation benefits:
• Lower current draw reduces cable cross-section requirements
• Decreased thermal stress on servo amplifier output stages
• Minimal voltage drop across long cable runs
• Direct compatibility with 400VAC three-phase infrastructure common in European and Asian facilities
Medium Inertia Design
The HF-SP family's medium-inertia design is optimized for applications with substantial mechanical loads, including driven carriages, rotary indexers, and ballscrew axes on machine tools. The 3:1 peak-to-rated torque ratio provides ample acceleration headroom for typical positioning cycle rates.
18-Bit Absolute Encoder
The high-resolution absolute encoder delivers 262,144 counts per revolution and maintains position data through power interruptions without battery support.
This eliminates homing sequences at startup and ensures immediate position knowledge when the system powers up.
IP67 Environmental Protection
IP67-rated housing provides complete protection against dust ingress and temporary immersion up to one meter for 30 minutes.
This robust sealing protects against coolant, cleaning fluids, and industrial contaminants that commonly cause premature motor failure.
Drive Compatibility
The HF-SP524 pairs with Mitsubishi MR-J3-60A4 (analogue/pulse command) or MR-J3-60B4 (SSCNET III fiber network command) servo amplifiers.
The SSCNET III architecture provides noise-immune fiber-optic communication for coordinated multi-axis systems with simplified wiring.
Frequently Asked Questions
Q1: What is the difference between the HF-SP524 and the HF-SP52, and when would I choose the 400V variant?
Both motors are 500W HF-SP units with identical torque, speed, and mechanical specifications.
The HF-SP52 operates from 200VAC at 2.9A, while the HF-SP524 uses 400VAC at 1.5A. Choose the 400V variant when your facility uses 400VAC three-phase infrastructure to simplify wiring and reduce thermal load.
Q2: What servo amplifier does the HF-SP524 require?
The correct amplifier pairing is the Mitsubishi MR-J3-60A4 (analogue and pulse-train command) or MR-J3-60B4 (SSCNET III fiber-optic network command), both rated for 400VAC three-phase input. The voltage class of drive and motor must match.
Q3: Why does the HF-SP series use medium inertia design?
Medium-inertia motors tolerate higher load-to-motor inertia ratios, making them suitable for applications with substantial mechanical loads like material handling carriages and machine tool axes. This design provides stable, well-damped axis response without excessive gain tuning.
Q4: Can the HF-SP524 be used without a brake on a vertical axis?
This variant has no integrated brake. For vertical axes carrying meaningful load weight, the braked variant (HF-SP524B) provides mechanical holding to prevent axis drop during power loss. The unbraked HF-SP524 is appropriate for horizontal axes and applications where the drive holds position actively.
Q5: What should be checked when sourcing a used HF-SP524?
Inspect the encoder connector and cable exit for damage or corrosion. Measure three-phase winding resistance for balance and check insulation resistance. Rotate the shaft to assess bearing condition and inspect shaft seals. A bench test including encoder verification and no-load run-up is recommended.
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