{"product_id":"mitsubishi-electric-fr-a840-3-7k-freqrol-a-800-vfd-inverter","title":"Mitsubishi Electric FR-A840-3.7K FREQROL-A 800 VFD Inverter","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eEngineered for high-torque heavy industrial loads, the Mitsubishi Electric FR-A840-3.7K variable frequency drive provides precise vector speed control within the FREQROL-A 800 series portfolio. This high-performance inverter accommodates four distinct duty ratings (SLD, LD, ND, and HD), allowing system integrators to scale motor driving capacity from 2.2 kW up to 5.5 kW based on load profiles. Operating on a three-phase 380 to 500 VAC supply, the \u003cstrong\u003eFR-A840-3.7K\u003c\/strong\u003e features advanced sensorless vector control, PM sensorless vector control, and built-in RS-485 communications to deliver exceptional speed stability, low-speed torque performance, and seamless automation system integration.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFour-Class Overload Ratings:\u003c\/strong\u003e Configurable for Super Light Duty (SLD), Light Duty (LD), Normal Duty (ND), and Heavy Duty (HD) profiles to match specific application demands.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdvanced Control Algorithms:\u003c\/strong\u003e Supports Real Sensorless Vector Control, PM Sensorless Vector Control, and Vector Control (with optional feedback card) for maximum motor performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Network Integration:\u003c\/strong\u003e Native RS-485 port with expansion compatibility for CC-Link, CC-Link IE Field, DeviceNet, PROFIBUS-DP, and Modbus RTU.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Starting Torque:\u003c\/strong\u003e Delivers up to 250% starting torque at 0.3 Hz in Heavy Duty (HD) mode under real sensorless vector control.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEmbedded Safety Functions:\u003c\/strong\u003e Dual-channel safety torque off (STO) compliant with safety standards for protective emergency stop operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConveyor Systems and Material Handling:\u003c\/strong\u003e Utilizing high starting torque and rapid deceleration control.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePumping and Fan Control:\u003c\/strong\u003e Energy optimization using the integrated optimum excitation control algorithm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtruders and Centrifuges:\u003c\/strong\u003e Heavy-duty speed regulation with continuous load variation recovery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHoists and Cranes:\u003c\/strong\u003e Precise load positioning utilizing high carrier frequency PWM and mechanical brake sequencing.\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;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eValue \/ Specification\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: 8px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eMitsubishi Electric\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eFR-A840-3.7K\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eSeries\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eFREQROL-A 800\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInput Voltage \/ Frequency\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3-phase 380 to 500 VAC, 50 Hz \/ 60 Hz\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eAllowable Voltage Fluctuation\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e323 to 550 VAC, 50 Hz \/ 60 Hz\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNormal Duty (ND) Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3.7 kW (Rated Current: 9.0 A)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eSuper Light Duty (SLD) Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e5.5 kW (Rated Current: 12.6 A)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eHeavy Duty (HD) Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e2.2 kW (Rated Current: 6.0 A)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOutput Voltage Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3-phase 380 to 500 VAC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOutput Frequency Range\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.2 to 590 Hz (Vector\/Sensorless limit: 400 Hz)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOverload Current Rating (ND)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e150% for 60 seconds, 200% for 3 seconds (at 50 degC)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCooling Method\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eForced Air Cooling\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eEnclosure Protection Rating\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eIP20 (Closed type)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-10 to +50 degC (LD\/ND\/HD without freezing); -10 to +40 degC (SLD)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eStorage Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-20 to +65 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNet Mass\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3.3 kg (7.28 lbs)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eShipping Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e4.4 kg (9.70 lbs)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eConnections and Interfaces\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;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eTerminal Designation\u003c\/th\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eSignal Type \/ Assignment\u003c\/th\u003e\n        \u003cth style=\"padding: 8px; font-weight: bold;\"\u003eElectrical Specification\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: 8px; font-weight: bold;\"\u003eR\/L1, S\/L2, T\/L3\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eAC Power Input\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3-phase 380 to 500 VAC, 50\/60 Hz\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eU, V, W\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eMotor Output Connections\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3-phase modulated variable AC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eTerminal 2\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eAnalog Voltage Frequency Command Input\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0 to 5 VDC, 0 to 10 VDC (Selectable)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eTerminal 4\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eAnalog Current Frequency Command Input\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e4 to 20 mA (or 0 to 20 mA)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eTerminal 1\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eAuxiliary Analog Input (Frequency Offset)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-10 to +10 VDC or -5 to +5 VDC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e12 Control Terminals\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eConfigurable Contact Inputs (Multi-speed, Reset, STO)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e24 VDC opto-isolated logic\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;\"\u003eThe FR-A840-3.7K serves as a direct technical successor to legacy FR-A740-3.7K models. It maintains matching physical mounting patterns, but boasts improved vector algorithm execution. When upgrading a system, parameters from older drives can be extracted and loaded into the newer inverter using Mitsubishi FR Configurator2 software via the integrated USB host port, though phase monitoring characteristics should be verified to prevent minor tuning anomalies on high-inertia loads.\u003c\/p\u003e\n\n\u003ch4\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eEngineers must exercise caution when operating in the Super Light Duty (SLD) rating class. While SLD elevates continuous output current capacity to 12.6 A for variable torque loads (pumps and fans), the permissible operating ambient temperature drops to 40 degC maximum (compared to 50 degC for standard ND and HD configurations). Placing an SLD-configured unit inside an unventilated outdoor panel can lead to rapid thermal de-rating faults (E.THT or E.TBM) if cabinet ambient temperatures surpass 40 degC.\u003c\/p\u003e\n\n\u003ch4\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eEnsure that the hardware slide switches located on the control circuit terminal block are configured to match the intended signal type before applying control voltage. If configuring Terminal 4 for 4 to 20 mA current input, check that Parameter 267 is set to '0' (initial value) and the input selection switch is in the 'I' position. Leaving the switch in 'V' (voltage) while applying a current loop input can damage the analog input circuitry.\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;\"\u003e\n  \u003cp style=\"color: #9b2c2c; font-weight: bold; margin: 0 0 0.5rem 0;\"\u003eCRITICAL WARNING: HIGH VOLTAGE RISK\u003c\/p\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0; font-size: 0.95rem;\"\u003eBefore executing any wiring or maintenance operations on this variable frequency drive, isolate the AC primary supply and wait a minimum of 10 minutes. Use a calibrated DC voltmeter to confirm that the DC bus charge LED has extinguished and that voltage across terminal P\/+ and N\/- has dropped below 30 VDC. Failure to observe discharge times can result in lethal shock or device destruction.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 1rem; color: #2d3748; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e1\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eMounting Orientation:\u003c\/strong\u003e Install the inverter vertically on a flat, non-flammable backplate. Ensure at least 50mm of clear spacing above and below the cooling fan exhaust to maintain optimal forced convective airflow.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e2\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003ePower and Ground Connections:\u003c\/strong\u003e Terminate phase input lines (L1, L2, L3) and motor output lines (U, V, W) using recommended ring terminals. Ensure the protective earth (PE) grounding terminal is connected directly to the primary panel ground bus bar using a low-impedance copper conductor.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e3\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cstrong\u003eControl Shielding:\u003c\/strong\u003e Route all control and analog signal cables through separate wireways, isolated from the high-power input\/output cabling. Ground the braided shields of the control lines only at the inverter-end ground plate to eliminate ground loops.\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mitsubishi Electric","offers":[{"title":"Default Title","offer_id":53102153335147,"sku":"FR-A840-3.7K","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-pv12osomnyy.png?v=1776137469","url":"https:\/\/www.plcprotech.com\/tr\/products\/mitsubishi-electric-fr-a840-3-7k-freqrol-a-800-vfd-inverter","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}