{"product_id":"mitsubushi-hf-sp81mk-s2-ac-servo-motor-hfsp81mks2-new-in-box-expedited-shipping","title":"MITSUBISHI HF-SP81MK-S2 AC Servo Motor","description":"\u003cdiv class=\"koeed-container\"\u003e\n    \u003c!-- SEO Introduction --\u003e\n    \u003ch2 class=\"koeed-heading\"\u003eMitsubishi HF-SP81MK-S2 AC Servo Motor (0.85kW)\u003c\/h2\u003e\n    \u003cp\u003eThe \u003cstrong\u003eMitsubishi HF-SP81MK-S2\u003c\/strong\u003e 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.\u003c\/p\u003e\n    \u003cp\u003eAt Koeed, we supply tested and verified CNC and automation components to ensure your multi-axis systems run smoothly. \u003cem\u003eKeywords: Mitsubishi Servo Motor, HF-SP81MK-S2, MELSERVO-J3, 0.85kW Servo, Medium Inertia Motor, CNC Replacement Part.\u003c\/em\u003e\u003c\/p\u003e\n\n    \u003c!-- Technical Specifications --\u003e\n    \u003ch2 class=\"koeed-heading\"\u003eTechnical Specifications\u003c\/h2\u003e\n    \u003cp\u003e\u003cem\u003eCritical 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.\u003c\/em\u003e\u003c\/p\u003e\n    \n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n        \u003ctable class=\"koeed-table\"\u003e\n            \u003cthead\u003e\n                \u003ctr\u003e\n                    \u003cth\u003eSpecification Category\u003c\/th\u003e\n                    \u003cth\u003eDetail \/ Parameter\u003c\/th\u003e\n                \u003c\/tr\u003e\n            \u003c\/thead\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eMitsubishi Electric\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eMotor Series\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eHF-SP (Medium Inertia, Medium Capacity)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eHF-SP81MK-S2\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eRated Output Capacity\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e0.85 kW (850 Watts)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eRated Speed\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e1000 r\/min (Max permissible speed generally 1500 - 2000 r\/min based on drive setup)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003ePower Supply Class\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003e200VAC Class (Requires corresponding MR-J3-100A\/B or similar amplifier)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eShaft Type\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eStraight Shaft with Keyway (indicated by \"K\")\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\u003cstrong\u003eFeedback System\u003c\/strong\u003e\u003c\/td\u003e\n                    \u003ctd\u003eBuilt-in High-Resolution Encoder (Typically 18-bit, 262,144 p\/rev for standard J3 series)\u003c\/td\u003e\n                \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- Application \u0026 Reliability --\u003e\n    \u003ch2 class=\"koeed-heading\"\u003eIndustrial Application \u0026amp; System Reliability\u003c\/h2\u003e\n    \u003cp\u003eWith its medium inertia design, the \u003cstrong\u003eHF-SP81MK-S2\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n    \u003c!-- Koeed B2B Tool: Electronic Gear Ratio Calculator --\u003e\n    \u003ch2 class=\"koeed-heading\"\u003e🛠️ Koeed Engineer's Tool: Servo Electronic Gear Ratio (CMX\/CDV) Calculator\u003c\/h2\u003e\n    \u003cp\u003eWhen 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 \u003cstrong\u003eCMX (Numerator)\u003c\/strong\u003e and \u003cstrong\u003eCDV (Denominator)\u003c\/strong\u003e. Use our calculator to instantly generate the simplified fractional parameters for your PLC or servo drive configuration.\u003c\/p\u003e\n    \n    \u003cnoscript\u003e\n        \u003cp\u003e\u003cstrong\u003eSEO Content Note:\u003c\/strong\u003e The Koeed Electronic Gear Ratio Calculator uses the formula: \u003cem\u003eRatio = Encoder Resolution \/ (Mechanical Travel per Rev \/ Command Pulse Unit)\u003c\/em\u003e. It then finds the Greatest Common Divisor (GCD) to simplify the numerator and denominator. JavaScript must be enabled to utilize this tool.\u003c\/p\u003e\n    \u003c\/noscript\u003e\n\n    \u003cdiv class=\"koeed-tool-card\"\u003e\n        \u003clabel for=\"koeed-encoder-res\"\u003e\u003cstrong\u003eEncoder Resolution (Pulses\/Rev):\u003c\/strong\u003e\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-encoder-res\" class=\"koeed-input\" value=\"262144\" min=\"1\"\u003e\n        \u003csmall style=\"color: #666; display: block; margin-bottom: 10px;\"\u003e*Standard Mitsubishi J3 18-bit encoder is 262,144.\u003c\/small\u003e\n\n        \u003clabel for=\"koeed-travel-rev\"\u003e\u003cstrong\u003eMechanical Travel per Revolution (e.g., Ball Screw Lead in mm):\u003c\/strong\u003e\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-travel-rev\" class=\"koeed-input\" value=\"10\" step=\"any\" min=\"0.001\"\u003e\n        \n        \u003clabel for=\"koeed-command-unit\" style=\"margin-top: 10px; display: block;\"\u003e\u003cstrong\u003eTarget Command Unit (e.g., 0.001 mm per pulse):\u003c\/strong\u003e\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-command-unit\" class=\"koeed-input\" value=\"0.001\" step=\"any\" min=\"0.00001\"\u003e\n        \n        \u003cbutton class=\"koeed-btn\" onclick=\"koeedCalculateGearRatio()\" style=\"margin-top: 15px;\"\u003eCalculate CMX \/ CDV\u003c\/button\u003e\n        \n        \u003cdiv id=\"koeed-result-box\" style=\"margin-top: 20px; display: none; background: #fff; padding: 15px; border-left: 4px solid #16c8c8;\"\u003e\n            \u003cp style=\"margin: 0; font-size: 1.1em;\"\u003e\u003cstrong\u003eNumerator (CMX):\u003c\/strong\u003e \u003cspan id=\"koeed-result-cmx\" style=\"color: #0056b3; font-weight: bold; font-size: 1.2em;\"\u003e0\u003c\/span\u003e\u003c\/p\u003e\n            \u003cp style=\"margin: 5px 0; font-size: 1.1em;\"\u003e\u003cstrong\u003eDenominator (CDV):\u003c\/strong\u003e \u003cspan id=\"koeed-result-cdv\" style=\"color: #0056b3; font-weight: bold; font-size: 1.2em;\"\u003e0\u003c\/span\u003e\u003c\/p\u003e\n            \u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 10px 0;\"\u003e\n            \u003cp style=\"margin: 0; font-size: 0.9em; color: #666;\"\u003e\u003cem\u003eInput these simplified values directly into your servo amplifier parameters.\u003c\/em\u003e\u003c\/p\u003e\n        \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- Troubleshooting FAQ --\u003e\n    \u003ch2 class=\"koeed-heading\"\u003eTroubleshooting FAQ for Mitsubishi HF-SP Servo Motors\u003c\/h2\u003e\n    \u003cdiv class=\"koeed-faq-section\"\u003e\n        \u003ch3\u003eQ: The MR-J3 amplifier displays an \"AL.16\" (Encoder Communication) error after replacing the motor. Why?\u003c\/h3\u003e\n        \u003cp\u003eA: 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.\u003c\/p\u003e\n        \n        \u003ch3\u003eQ: The motor triggers an \"AL.50\" or \"AL.51\" (Overload) alarm during rapid acceleration.\u003c\/h3\u003e\n        \u003cp\u003eA: 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.\u003c\/p\u003e\n        \n        \u003ch3\u003eQ: Do I need to replace the battery for the HF-SP81MK-S2 absolute encoder?\u003c\/h3\u003e\n        \u003cp\u003eA: 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.\u003c\/p\u003e\n    \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Koeed Custom Styles \u0026 Scripts --\u003e\n\u003cstyle\u003e\n    .koeed-container { width: 100%; font-family: inherit; line-height: 1.6; color: #333; }\n    .koeed-heading { color: #0056b3; border-bottom: 2px solid #16c8c8; padding-bottom: 8px; margin-top: 30px; }\n    .koeed-table { width: 100%; border-collapse: collapse; margin-bottom: 20px; }\n    .koeed-table th, .koeed-table td { border: 1px solid #eeeeee; padding: 12px; text-align: left; }\n    .koeed-table tr:nth-child(even) { background-color: #fafafa; }\n    .koeed-table tr:nth-child(odd) { background-color: #f4fcfc; }\n    .koeed-table th { background-color: #0056b3; color: white; }\n    .koeed-tool-card { border: 1px solid #eeeeee; padding: 25px; background: #fafafa; border-top: 4px solid #16c8c8; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }\n    .koeed-input { padding: 10px; border: 1px solid #ccc; width: 100%; box-sizing: border-box; font-size: 16px; margin-top: 5px; }\n    .koeed-btn { background-color: #16c8c8; color: white; border: none; padding: 12px 24px; font-size: 16px; cursor: pointer; font-weight: bold; transition: background-color 0.3s ease; }\n    .koeed-btn:hover { background-color: #0056b3; }\n    .koeed-faq-section h3 { color: #333; margin-top: 20px; font-size: 1.1em; }\n    .koeed-faq-section p { margin-top: 5px; color: #555; }\n\u003c\/style\u003e\n\n\u003cscript\u003e\n    \/\/ Euclidean algorithm for Greatest Common Divisor\n    function koeedGCD(a, b) {\n        return b === 0 ? a : koeedGCD(b, a % b);\n    }\n\n    function koeedCalculateGearRatio() {\n        var encoderRes = parseFloat(document.getElementById(\"koeed-encoder-res\").value);\n        var travelPerRev = parseFloat(document.getElementById(\"koeed-travel-rev\").value);\n        var commandUnit = parseFloat(document.getElementById(\"koeed-command-unit\").value);\n        \n        var resultBox = document.getElementById(\"koeed-result-box\");\n        var cmxSpan = document.getElementById(\"koeed-result-cmx\");\n        var cdvSpan = document.getElementById(\"koeed-result-cdv\");\n\n        if(encoderRes \u003e 0 \u0026\u0026 travelPerRev \u003e 0 \u0026\u0026 commandUnit \u003e 0) {\n            \/\/ Calculate total pulses needed per mechanical revolution based on user unit\n            var pulsesPerRevNeeded = travelPerRev \/ commandUnit;\n            \n            \/\/ To avoid floating point issues in GCD, round to nearest integer\n            \/\/ (In real engineering, travel\/command unit usually results in a whole number)\n            var numerator = Math.round(encoderRes);\n            var denominator = Math.round(pulsesPerRevNeeded);\n\n            var divisor = koeedGCD(numerator, denominator);\n            \n            var cmx = numerator \/ divisor;\n            var cdv = denominator \/ divisor;\n            \n            cmxSpan.innerText = cmx;\n            cdvSpan.innerText = cdv;\n            \n            resultBox.style.display = \"block\";\n        } else {\n            alert(\"Please enter valid, positive numbers for all fields.\");\n        }\n    }\n\u003c\/script\u003e\n\n\u003c!-- JSON-LD Structured Data for SEO --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n[\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n      {\n        \"@type\": \"Question\",\n        \"name\": \"Why does the MR-J3 amplifier display an AL.16 Encoder Communication error after replacing the HF-SP motor?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"AL.16 indicates a loss of serial communication. For a custom -S2 motor, verify the encoder cable pinout matches perfectly. Also, ensure the cable shield is grounded at the drive side to prevent EMI disruption.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"Why does the motor trigger an AL.50 or AL.51 Overload alarm during rapid acceleration?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Overload alarms occur if the mechanical system is binding, if auto-tuning parameters are too aggressive for the load inertia, or if the UVW motor phases are wired incorrectly.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"Do I need to replace the battery for the HF-SP81MK-S2 absolute encoder?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"The battery is not inside the motor; it is connected to the servo amplifier. 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