{"product_id":"mitsubishi-electric-fr-a840-3-7k-1-fr-a800-variable-frequency-drive","title":"Mitsubishi Electric FR-A840-3.7K-1 FR-A800 Variable Frequency Drive","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Engineered to deliver exceptional motor control performance, the \u003cstrong\u003eMitsubishi Electric FR-A840-3.7K-1\u003c\/strong\u003e is a highly versatile three-phase 400V class variable frequency drive from the robust FR-A800 series. Designed for demanding heavy industrial applications, this inverter provides precise speed and torque regulation with an output rating of \u003cstrong\u003e3.7 kW\u003c\/strong\u003e and an output current of \u003cstrong\u003e9 A\u003c\/strong\u003e. Integrated serial communication protocols make this drive highly compatible with diverse automation architectures.\n\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003eReal sensorless vector control and advanced magnetic flux vector control for precise low-speed torque.\u003c\/li\u003e\n  \u003cli\u003eEmbedded RS-485, RS-422, and RS-232 serial ports for seamless communication.\u003c\/li\u003e\n  \u003cli\u003eInherent energy-saving algorithms optimizing efficiency in fan and pump networks.\u003c\/li\u003e\n  \u003cli\u003eCompliance with international functional safety standards including CE, UL, and cUL.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIndustrial Applications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003eConveyor and material handling networks requiring strict speed profiles.\u003c\/li\u003e\n  \u003cli\u003eIndustrial fans, centrifugal pumps, and secondary aeration blowers.\u003c\/li\u003e\n  \u003cli\u003eMixers, extruders, and packaging machinery needing robust starting torque.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #2b6cb0;\"\u003e\n        \u003cth style=\"text-align: left; padding: 0.75rem; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 0.75rem; font-weight: bold;\"\u003eSpecification\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eMitsubishi Electric\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eFR-A840-3.7K-1\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eSeries\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eFR-A800 Series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eApplicable Motor Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e3.7 kW\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eInput Voltage Class\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eThree-phase 400 V Class\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOutput Voltage\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eThree-phase 380 to 500 V\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOutput Rated Current\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e9 A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOutput Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e6.9 kVA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eExternal Communication\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eRS-232 \/ RS-422 \/ RS-485\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eCertifications and Standards\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCE, UL, cUL\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eWidth\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e150 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eHeight\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e260 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eDepth\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e140 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eShipping Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e4.5 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eControl Terminal Connections\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #2b6cb0;\"\u003e\n        \u003cth style=\"text-align: left; padding: 0.75rem; font-weight: bold;\"\u003eTerminal Symbol\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 0.75rem; font-weight: bold;\"\u003eTerminal Function \u0026amp; Description\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eSTF\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eForward Rotation Start (Short STF-SD to start forward rotation, open to decelerate to stop)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eSTR\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eReverse Rotation Start (Short STR-SD to start reverse rotation, open to decelerate to stop)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eSD\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCommon Terminal for Contact Inputs (Isolated from circuit common)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003ePC\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e24 VDC Power supply output \/ External transistor common terminal\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003e10, 2, 5\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eFrequency Setting Voltage Analog Inputs (0 to 5 VDC, 0 to 10 VDC)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003e4, 5\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eFrequency Setting Current Analog Inputs (4 to 20 mADC)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eA, B, C\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eRelay Contact Alarm Output (Indicates drive fault protection activation)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  The drive functions as a modern replacement for legacy FR-A740-3.7K units. While installation dimensions align closely, control terminal spacing and auxiliary terminal mappings should be verified. Users looking to load parameter files from older iterations should use FR Configurator2 software to ensure non-compatible parameters are modified prior to deployment.\n\u003c\/p\u003e\n\u003ch4\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Operating at carrier frequencies higher than 12 kHz may trigger thermal-related current derating. If motor cable distances exceed 30 meters, high-frequency voltage spikes (reflected waves) can degrade motor insulation. In such layouts, installing a dV\/dt or output reactor is necessary to safeguard the system.\n\u003c\/p\u003e\n\u003ch4\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\n  Always ground the drive chassis to a dedicated earth terminal using a low-impedance conductor. Route all low-voltage analog control wiring (such as 0-10V or 4-20mA signals) through shielded twisted-pair cabling, separating them from high-voltage motor and input power leads by a minimum of 100 mm to suppress noise coupling.\n\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 1rem; margin-bottom: 1.5rem; color: #9b2c2c;\"\u003e\n  \u003cstrong\u003eCRITICAL WARNING:\u003c\/strong\u003e Hazardous voltage levels remain present inside the drive capacitor bank even after mains isolation. De-energize all primary and auxiliary power lines. Allow a minimum of 10 minutes for electrical discharge, then verify the DC bus voltage across terminals P\/+ and N\/- is below 45 VDC using a calibrated voltmeter before handling terminal connections.\n\u003c\/div\u003e\n\n\u003col style=\"list-style: none; padding-left: 0; margin-bottom: 1.5rem;\"\u003e\n  \u003cli style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e1\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003eSecurely mount the inverter vertically on a flat, non-flammable surface to facilitate proper airflow through the heat sink channels.\u003c\/span\u003e\n  \u003c\/li\u003e\n  \u003cli style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e2\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003eWire the input power supply lines to input terminals R\/L1, S\/L2, and T\/L3. Connect motor phases directly to output terminals U, V, and W. Do not connect AC mains power to output terminals.\u003c\/span\u003e\n  \u003c\/li\u003e\n  \u003cli style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e3\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003eTerminate control inputs and verify appropriate digital logic sink\/source parameters are matched by positioning the internal slide switch correctly.\u003c\/span\u003e\n  \u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Mitsubishi Electric","offers":[{"title":"Default Title","offer_id":53102143209835,"sku":"FR-A840-3.7K-1","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/fr-a840-3.7k-1-toajiaosjys.png?v=1776137468","url":"https:\/\/www.plcprotech.com\/ms\/products\/mitsubishi-electric-fr-a840-3-7k-1-fr-a800-variable-frequency-drive","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}