Mitsubishi Electric FR-A840-00620-2-60 FR-A800 Series Inverter

Description

Engineered for high-performance motor control in demanding industrial environments, the Mitsubishi Electric FR-A840-00620-2-60 variable frequency drive delivers exceptional vector control accuracy within the FR-A800 Series architecture. This three-phase inverter is optimized for constant torque applications, providing reliable speed and torque regulation for heavy-duty machinery. With its integrated 6K-step PLC and advanced safety functionalities, the drive simplifies system architecture by eliminating the need for external controllers in localized automation loops.

Features

• Real Sensorless Vector (RSV) Control: Achieves high-precision speed and torque control up to 400 Hz without requiring a dedicated encoder feedback loop.
• Integrated Safety Architecture: Built-in compliance with SIL2 and PLd safety standards ensures safe torque-off (STO) functionality directly at the drive level.
• Embedded Automation Logic: Built-in Mitsubishi L-Series PLC functionality allows for customized control programming up to 6,000 steps.
• Energy Optimization: Optimum Excitation Control technology continuously tunes the motor flux to minimize losses, yielding up to an additional 12% energy savings over standard V/f control.
• Diagnostic Maintenance: Internal thermal sensors and component life diagnostics track the degradation of main circuit capacitors, cooling fans, and inrush currents.

Applications

• Winding and Tensioning Systems: Direct tension control and dancer feedback loops for paper, film, and wire lines.
• Cranes and Hoists: Smooth brake sequence control and high-torque generation at zero speed for lifting mechanisms.
• Machine Tool Spindles: High-speed orientation and rapid acceleration/deceleration performance under variable loads.
• Heavy Conveyors: Master-slave torque sharing configurations for multi-drive bulk material handling systems.

Technical Specifications Table

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The FR-A840-00620-2-60 is fully backwards compatible with the legacy FR-A740-00620 series parameters. By utilizing the FR-Configurator 2 software suite, users can migrate parameters without manual re-entry. Note, however, that physical footprint and terminal block locations differ slightly; ensure mounting panels accommodate the depth variance of 190 mm.

Application Pitfalls & Engineering Notes

When deploying this drive in constant-torque configurations at low frequencies (below 6 Hz), standard self-cooled motors will experience high heat generation due to reduced fan speed. In these scenarios, a motor with an independent cooling fan (forced ventilation) is required. Ensure the drive enclosure maintains a 100 mm top and bottom clearance for unrestricted heat sink airflow.

Commissioning & Wiring Tips

For reliable RS-485 or SSCNet communication, control wiring must use twisted-pair shielded cables separate from the power cables. Keep the control wiring separated from the main circuit wiring by at least 10 cm to prevent high-frequency electromagnetic interference. Connect the shield braid directly to the ground plate rather than using a pigtail connection.

Installation Guidelines