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MITSUBISHI

MITSUBISHI HF-SP81MK-S2 AC Servo Motor

MITSUBISHI HF-SP81MK-S2 AC Servo Motor

$1,415.48 USD
$1,415.48 USD $1,415.48 USD
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MPN hf-sp81mk-s2
Voltage 220V
New in Box Yes
RPM 1440 RPM
Phase Single Phase
Power 0.5HP
Torque 3.5 Nm
Control Digital
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Description


MITSUBISHI HF-SP81MK-S2 AC Servo Motor

MITSUBISHI HF-SP81MK-S2 AC Servo Motor delivers high performance for industrial automation with 1440 RPM and 3.5 Nm torque.

MITSUBISHI HF-SP81MK-S2 AC Servo Motor is a high-performance motor designed for industrial automation and control applications. It operates at 220V single phase, providing 0.5 horsepower with 1440 RPM and 3.5 Nm torque. Equipped with digital control, this motor ensures precise speed regulation and is ideal for applications requiring high efficiency and reliability. The motor is packaged new in box, ensuring optimal performance and durability.

Mitsubishi HF-SP81MK-S2 AC Servo Motor (0.85kW)

The Mitsubishi HF-SP81MK-S2 is a robust, medium-inertia AC servo motor designed for the MELSERVO-J3 amplifier series. Delivering a rated output of 0.85 kW and a nominal speed of 1000 r/min, the HF-SP series is highly regarded for its stable torque delivery and rapid response in industrial automation. The "K" designation indicates a keyway shaft for secure mechanical coupling, while the "-S2" suffix denotes a specialized OEM configuration, often related to specific connector alignments or environmental seals.

At Koeed, we supply tested and verified CNC and automation components to ensure your multi-axis systems run smoothly. Keywords: Mitsubishi Servo Motor, HF-SP81MK-S2, MELSERVO-J3, 0.85kW Servo, Medium Inertia Motor, CNC Replacement Part.

Technical Specifications

Critical Note: The parameters below represent the standard HF-SP81 foundation. The "-S2" custom suffix may imply variations in encoder cabling or waterproof seals. Always visually verify the connector type against your existing motor before installation.

Specification Category Detail / Parameter
Manufacturer Mitsubishi Electric
Motor Series HF-SP (Medium Inertia, Medium Capacity)
Part Number HF-SP81MK-S2
Rated Output Capacity 0.85 kW (850 Watts)
Rated Speed 1000 r/min (Max permissible speed generally 1500 - 2000 r/min based on drive setup)
Power Supply Class 200VAC Class (Requires corresponding MR-J3-100A/B or similar amplifier)
Shaft Type Straight Shaft with Keyway (indicated by "K")
Feedback System Built-in High-Resolution Encoder (Typically 18-bit, 262,144 p/rev for standard J3 series)

Industrial Application & System Reliability

With its medium inertia design, the HF-SP81MK-S2 is optimized for applications requiring high stability during load fluctuations, such as heavy-duty conveyor systems, CNC machine tool axes, and robotic positioning arms. Ensuring proper grounding and shielding of the encoder cable is crucial, as the high-resolution feedback system is sensitive to electromagnetic interference (EMI) from adjacent variable frequency drives or contactors.

🛠️ Koeed Engineer's Tool: Servo Electronic Gear Ratio (CMX/CDV) Calculator

When replacing a motor or modifying the mechanical transmission (e.g., changing a ball screw), engineers must update the Electronic Gear Ratio in the servo amplifier. For Mitsubishi MR-J3/J4 drives, this is defined by parameters CMX (Numerator) and CDV (Denominator). Use our calculator to instantly generate the simplified fractional parameters for your PLC or servo drive configuration.

*Standard Mitsubishi J3 18-bit encoder is 262,144.

Troubleshooting FAQ for Mitsubishi HF-SP Servo Motors

Q: The MR-J3 amplifier displays an "AL.16" (Encoder Communication) error after replacing the motor. Why?

A: AL.16 indicates a loss of communication between the motor's absolute encoder and the drive. For an "-S2" custom motor, ensure the pinout of the replacement encoder cable matches the original. Additionally, verify that the encoder cable shield is properly grounded at the drive side, as EMI can disrupt the high-speed serial data.

Q: The motor triggers an "AL.50" or "AL.51" (Overload) alarm during rapid acceleration.

A: Overload alarms often occur if the mechanical system is binding (check ball screw lubrication and linear guides), or if the auto-tuning parameters are too aggressive for the load inertia. It can also happen if the motor phases (U, V, W) are incorrectly wired, causing the motor to fight against itself.

Q: Do I need to replace the battery for the HF-SP81MK-S2 absolute encoder?

A: The battery is not located inside the motor itself; it is typically connected to the MR-J3 servo amplifier (e.g., MR-BAT). If the drive displays an "AL.9F" (Battery Warning), replace the drive battery while the control power remains ON to prevent losing the absolute home position.

About Koeed Automation

Expert Supply Solutions for Global Industrial Electronics

At Koeed.com, we are professional architects of the industrial electronics supply chain. We specialize in providing high-performance PLCs, HMIs, Servo Motors, Drives, and Converters to ensure that modern manufacturing operations remain efficient, reliable, and future-proof in 2026’s competitive landscape.

🛡️ Certified Quality

We source only 100% authentic industrial hardware from global category leaders. Every component undergoes a rigorous verification process to meet Industry 4.0 reliability standards.

⚙️ Engineering Domain

Our experts provide more than just parts; we offer technical insight. We assist in complex product selection and compatibility audits for both legacy system upgrades and new installations.

🌐 Rapid Global Logistics

Time is money in industrial automation. Our optimized supply network ensures that critical components reach your facility quickly, significantly reducing unplanned downtime and operational loss.

Strategic Global Portfolio: Siemens, Omron, FANUC, Schneider Electric, Mitsubishi, Yaskawa, Allen-Bradley, and other elite industrial brands.

Supporting your vision for a smarter, more efficient industrial future.

Alternative Names


  • HF-SP81MK-S2
  • HF-SP81MK
  • HF-SP81M

Special Reminder

Important

If you have any questions about product information and prices, please feel free to contact us by email or WhatsApp. We will respond quickly.

  • Business Days Only (Monday through Saturday)
  • It takes up to 10 days from the time of ordering (excluding Saturdays and Sundays) to the time of delivery to your designated location. Worldwide delivery.
  • Within 3 days after placing the order, we will send you photos and videos of the product via email or WhatsApp for confirmation

International shipping - items may be subject to customs processing depending on the item's customs value.
Sellers declare the item's customs value and must comply with customs declaration laws.
As the buyer, you should be aware of possible:

  • Delays from customs inspection.
  • Import duties and taxes which buyers must pay.
  • Brokerage fees payable at the point of delivery.

Shipping Policy

Global Delivery

We ship to customers all over the world. Our primary logistics providers are DHL, UPS, TNT, FedEx, and EMS.

Processing Time

All orders are processed within 72 hours of purchase. Please note that this applies to business days only.

Shipping Rates & Delivery Estimates

Shipping charges for your order will be calculated and displayed at checkout. Delivery estimates are within 7-14 days. Please note that these shipping times are only estimates and unfortunately, cannot be guaranteed.

Shipment Confirmation & Order Tracking

You will receive a Shipment Confirmation email once your order has shipped containing your tracking number(s). The tracking number will be active within 24 hours.

Customs, Duties, and Taxes

Please note, international shipping services do vary from country to country. To find out the exact services that are available, please put in your full address at checkout. Shipping internationally does mean that you may be required to pay customs and import taxes. All international customers are responsible for the customs rates within their own country. For further information, we recommend contacting your local customs office.

Damages

We take every reasonable precaution to ensure that products are not damaged. If the item is damaged in transit, please immediately contact us. We are not liable for any products damaged or lost during shipping. If you received your order damaged, please contact the shipment carrier to file a claim. Please save all packaging materials and damaged goods before filing a claim.

Force Majeure

When encountering with force majeure, the processing of orders will be delayed. Nevertheless, it is ensured that your order will be processed in a fast manner when weather permits.

Address Verification

Please verify you have the correct shipping address on your order PRIOR to making payment as this is the address we will ship to.

Return Policy

For more information, visit our Return Policy page.

International shipping - items may be subject to customs processing depending on the item's customs value.

Sellers declare the item's customs value and must comply with customs declaration laws.
As the buyer, you should be aware of possible:
• Delays from customs inspection.
• Import duties and taxes which buyers must pay.
• Brokerage fees payable at the point of delivery.

Contact Us

If you have any questions about your order, please contact us at moritta@koeed.com.

Return Policy

Return and Refund Policy

We want you to be completely satisfied with your purchase on our store. If for any reason you are not entirely satisfied, we're here to help!

Returns

You have a generous 30 calendar days to return an item from the date you received it. To be eligible for a return, ensure the item is in its original, unworn, and unused condition with tags and packaging intact. Retain your receipt or proof of purchase for eligibility. Please note that certain items are non-returnable like perishables, custom products, personal care goods, hazardous materials, flammable liquids, and gases. Reach out for clarifications on specific items.

Return Process

Commence the return process by reaching out to us at moritta@koeed.com. Upon approval, we will furnish you with a return shipping label and detailed instructions for dispatching your package. Unnotified returns will not be accepted.

Damages and Issues

Kindly review your order upon delivery. Notify us promptly if it arrives defective, damaged, or incorrect. We will address the matter swiftly.

Exchanges

Facilitate a swift exchange by returning the original item once approved and making a new purchase.

EU 14-Day Cooling Off Period

EU-bound shipments allow a 14-day cancellation or return period without justification. Conditions mirror standard returns.

Refunds

Upon receiving and inspecting your return, we’ll inform you of the refund status. Approved refunds are automatically processed within 10 business days via the initial payment method. Allow time for financial institutions to finalize the refund. For delays exceeding 15 business days post-approval, contact us at moritta@koeed.com.

Shipping

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Contact Us

If you have any questions on how to return your item to us, feel free to contact us at moritta@koeed.com.

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