The Mitsubishi Electric FR-A840-90K-1-06 Inverter is a high-performance variable frequency drive (VFD) from Mitsubishi Electric Corporation's acclaimed A800 series, designed to deliver precise motor speed control for three-phase AC induction motors up to 90 kW. Operating from 380-500V three-phase input with an output frequency range of 0.2 to 590 Hz, this inverter provides the flexible, energy-efficient motor control that modern industrial automation systems demand. Manufactured in Japan with final assembly in China, the FR-A840-90K combines advanced vector control technology with robust power stage design to optimize performance across a comprehensive range of industrial applications.

Variable frequency drives have become indispensable components in industrial automation, process control, and building management systems. By varying both the frequency and voltage supplied to AC motors, VFDs enable precise speed and torque control that improves process quality, reduces energy consumption, extends mechanical equipment life, and lowers maintenance costs. The Mitsubishi A800 series represents the company's flagship general-purpose inverter line, incorporating decades of drive technology development and field application experience into a product platform trusted by engineers worldwide.

At Auto2mation, we understand that motor control reliability directly impacts production output, product quality, and operational costs. A VFD failure can halt entire production lines, compromise process safety, and result in expensive emergency repairs. The Mitsubishi FR-A840-90K-1-06 has been selected by our procurement team for its proven track record of reliability in demanding industrial environments, from manufacturing plants and water treatment facilities to marine propulsion and deck machinery applications.

Key Features & Specifications

The Mitsubishi FR-A840-90K-1-06 Inverter integrates an extensive set of capabilities that address the motor control requirements of industrial automation professionals. From its advanced control algorithms to its comprehensive protection functions, every feature has been engineered to maximize operational efficiency and equipment reliability.

• 90 kW Rated Capacity: Drives three-phase AC induction motors up to 90 kW (approximately 120 HP), suitable for large pumps, fans, compressors, conveyors, mixers, and material handling equipment.
• Wide Output Frequency Range: 0.2 to 590 Hz frequency range enables ultra-low speed operation for positioning applications and high-speed operation for specialized machinery requirements.
• 3-Phase 380-500V Input: Compatible with standard European and Asian industrial power systems, accommodating voltage variations across the 380V, 400V, 415V, and 480V nominal system voltages.
• Advanced Vector Control: Sensorless vector control and flux vector control options provide precise torque and speed regulation without requiring external encoder feedback in most applications.
• Multiple Duty Ratings: ND (Normal Duty) rated at 180A at 50°C, SLD (Super Light Duty) at 260A at 40°C, LD (Light Duty) at 216A at 50°C, and HD (Heavy Duty) at 144A at 50°C, providing flexibility for different load profiles.
• Built-in EMC Filter: Integrated radio frequency interference filter reduces electromagnetic emissions, simplifying compliance with EMC directives and preventing interference with nearby electronic equipment.
• Comprehensive Protection: Overcurrent, overvoltage, undervoltage, overload, earth fault, phase loss, stall prevention, and motor thermal protection functions safeguard both the inverter and the connected motor.
• Network Communication: Supports CC-Link, RS-485, and optional Ethernet/IP, PROFIBUS-DP, and DeviceNet communication protocols for integration with PLC and DCS automation platforms.

Technical Specifications

Specification	Details
Product Name	Mitsubishi Electric FR-A840-90K-1-06 Inverter
Series	A800
Model	FR-A840-90K-1-06
Manufacturer	Mitsubishi Electric Corporation
Input Voltage	3-Phase AC 380-500V, 50Hz/60Hz
ND Current (50°C)	180A
SLD Current (40°C)	260A
Output Voltage	3-Phase AC 380-500V
Output Frequency	0.2 to 590 Hz
LD Current (50°C)	216A
HD Current (50°C)	144A
Weight	54.800 Kg

Applications & Use Cases

The Mitsubishi FR-A840-90K-1-06 Inverter supports motor control applications across virtually every industry that utilizes three-phase AC motors in the 90 kW power range. Its versatile feature set and robust construction make it equally suitable for constant torque loads, variable torque loads, and high-starting-torque applications.

Pump and Fan Control

Centrifugal pumps and fans represent ideal VFD applications, with energy savings of 30-50% commonly achieved by modulating speed rather than throttling flow. The FR-A840-90K's 90 kW capacity covers large HVAC supply and exhaust fans, primary and secondary water circulation pumps, cooling tower fans, and process fluid transfer pumps. Built-in PID control enables the inverter to maintain pressure, flow, or temperature setpoints without requiring an external controller, simplifying system architecture and reducing component count.

Marine Propulsion and Deck Machinery

Modern vessels utilize VFD-controlled electric motors for propulsion, thrusters, winches, cranes, and cargo handling equipment. The FR-A840-90K's marine-compatible voltage range and robust protection functions make it suitable for these demanding applications. The inverter's ability to deliver high starting torque enables confident control of winch and crane loads, while precise speed regulation supports dynamic positioning system performance for offshore vessels.

Material Handling and Conveying

Conveyor systems, bucket elevators, screw conveyors, and chain drives in mining, aggregate processing, and bulk material handling facilities require reliable motor control that can handle high starting loads and variable material feed rates. The FR-A840-90K's heavy-duty current rating of 144A at 50°C provides the thermal margin necessary for continuous operation in dusty, high-ambient-temperature environments where ventilation may be limited.

Mixing and Agitation

Industrial mixers, agitators, and kneaders in chemical processing, food production, and pharmaceutical manufacturing require controlled speed variation to achieve consistent product quality. The inverter's broad 0.2-590 Hz frequency range accommodates both slow-speed blending operations and high-shear dispersion processes, while vector control ensures stable torque delivery across the entire speed range regardless of viscosity changes.

Compressor Control

Air compressors, refrigeration compressors, and gas compressors benefit from VFD control through improved part-load efficiency, reduced mechanical stress from line starts, and precise pressure regulation. The FR-A840-90K's capacity is well-matched to large rotary screw and reciprocating compressor systems serving industrial facilities, shipboard air systems, and process gas handling applications.

Why Choose the Mitsubishi FR-A840-90K-1-06

A800 Series Excellence

Mitsubishi Electric's A800 series represents the company's most advanced general-purpose inverter platform, incorporating performance features previously available only in specialized servo drives. The series' sensorless vector control algorithm delivers speed regulation accuracy within ±0.5% and torque response times under 0.3 seconds, providing the dynamic performance required by demanding applications without the cost and complexity of external encoder feedback systems.

Energy Efficiency Leadership

The FR-A840-90K incorporates Mitsubishi's latest power semiconductor technology and optimized PWM switching patterns to maximize drive efficiency across the operating speed range. Automatic energy optimization functions further reduce power consumption during steady-state operation by adjusting the motor flux to match the actual load torque. For facilities operating multiple large drives, these efficiency improvements translate into substantial reductions in electricity costs and carbon footprint.

Global Service and Support Network

Mitsubishi Electric maintains an extensive global network of factory-trained service engineers, authorized distributors, and technical support centers. This infrastructure ensures that spare parts, technical documentation, and professional assistance are readily available wherever your facility is located. Auto2mation complements this manufacturer support with our own 30-day warranty and dedicated customer service team.

Compatibility & Integration

The Mitsubishi FR-A840-90K-1-06 Inverter is designed for straightforward integration with standard industrial control system architectures. Its 380-500V three-phase input is compatible with European and Asian low-voltage power distribution systems, while the multiple communication options enable seamless connectivity with Mitsubishi, Siemens, Rockwell, Schneider, and other major PLC platforms. The inverter's parameterized I/O configuration allows customization of analog and digital inputs and outputs to match specific application requirements without requiring external signal conditioning hardware.

For retrofit applications, the FR-A840 series shares mounting dimensions and I/O configurations with earlier Mitsubishi A700 and F700 series drives in many power ranges, simplifying replacement of legacy equipment. Auto2mation's technical team can assist with compatibility verification and provide guidance on parameter translation from legacy drive models to the A800 series configuration.

Maintenance & Support

Mitsubishi A800 series drives are designed for long service life with minimal maintenance requirements. Periodic inspection should include verification of cooling fan operation, cleaning of heatsink surfaces and air filters, inspection of power terminal tightness, and checking of DC bus capacitor condition using the drive's built-in diagnostic functions. The inverter's real-time clock and maintenance timer functions provide automated reminders for scheduled service activities.

Auto2mation provides a 30-day warranty on this used FR-A840-90K-1-06 inverter, along with free worldwide shipping and technical support. Our experienced team can assist with installation guidance, parameter configuration, troubleshooting, and integration with your existing control system architecture.

Frequently Asked Questions

Q1: What motor power rating does the FR-A840-90K-1-06 support?

This inverter supports three-phase AC induction motors up to 90 kW (approximately 120 HP), with current ratings varying by duty type: ND 180A, SLD 260A, LD 216A, and HD 144A.

Q2: What is the output frequency range of this inverter?

The output frequency range is 0.2 to 590 Hz, enabling both ultra-low speed positioning and high-speed specialized applications.

Q3: What input voltage does the FR-A840-90K require?

The inverter requires 3-phase AC 380-500V at 50Hz/60Hz, compatible with standard European and Asian industrial power systems.

Q4: Who manufactures this inverter?

The inverter is manufactured by Mitsubishi Electric Corporation, made in Japan with final assembly in China.

Q5: What is the weight of this inverter?

The Mitsubishi FR-A840-90K-1-06 weighs 54.800 Kg, reflecting its substantial power stage construction and thermal management system.

Q6: What communication protocols does this inverter support?

The A800 series supports CC-Link, RS-485, and optional Ethernet/IP, PROFIBUS-DP, and DeviceNet protocols for integration with major PLC and DCS platforms.

Q7: What warranty does Auto2mation provide?

Auto2mation provides a 30-day warranty, free worldwide shipping, and technical support for installation and integration assistance.

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