MITSUBISHI ELECTRIC FR-A740-5.5K-CHT R99K44034 Product Description

Overview

MITSUBISHI ELECTRIC FR-A740-5.5K-CHT R99K44034 is a high-performance vector inverter of Mitsubishi FREQROL A700 series, 3-phase 400V class, rated 5.5kW. MITSUBISHI ELECTRIC FR-A740-5.5K-CHT R99K44034 supports sensorless vector control, torque control and closed-loop vector control with encoder option, suitable for heavy-load starting, constant torque and high-speed precision drive applications. R99K44034 is the internal serial batch identifier for spare traceability and inventory management. This model is discontinued, widely stocked as legacy spare part for equipment maintenance and replacement.

Features

MITSUBISHI ELECTRIC FR-A740-5.5K-CHT R99K44034 adopts advanced sensorless vector algorithm, achieving high torque output at low speed (0.5Hz 200% torque). It supports multiple control modes: V/F control, sensorless vector control, encoder feedback vector control, torque control. It has built-in braking transistor and can be matched with external braking resistor for frequent deceleration and high inertia load. The front panel LCD display shows running frequency, current, voltage, torque, alarm history and parameter group. It has rich built-in I/O terminals, analog input/output (4-20mA/0-10V), RS485 communication port supporting Modbus RTU. Optional expansion cards include encoder feedback card, CC-Link card, analog card and relay output card. It integrates comprehensive protection functions: overcurrent, overvoltage, undervoltage, overload, phase loss, overheat, motor overload and stall prevention. -CHT suffix indicates Chinese market version with Chinese manual and certification.

Specs

Brand: MITSUBISHI ELECTRIC Model: FR-A740-5.5K-CHT Serial code: R99K44034 Product series: FREQROL A700 Product category: Vector AC inverter Applicable motor: 5.5kW Input: 3-phase 380~480V AC 50/60Hz Rated output current: 12.6A Frequency range: 0.2~400Hz Control mode: V/F, sensorless vector, closed-loop vector, torque control Communication: RS485 Modbus RTU, optional CC-Link Cooling: Fan cooling Protection: IP20 Lifecycle: Discontinued Successor: FR-A800 series

Principle

MITSUBISHI ELECTRIC FR-A740-5.5K-CHT R99K44034 rectifies three-phase AC into DC, then outputs variable frequency PWM AC to drive the motor. In sensorless vector mode, the inverter estimates motor rotor position and torque current through motor model, realizing high dynamic torque response. When equipped with encoder option card, it forms closed-loop vector control for higher speed accuracy and torque stability. It receives speed/torque commands from PLC, potentiometer or communication bus, and feeds back running status, fault signals to upper control system.

Applications

MITSUBISHI ELECTRIC FR-A740-5.5K-CHT R99K44034 is widely used for heavy-duty variable speed drive. It is commonly applied in extruders, mixers, lifting equipment, conveyor lines, compressors, pumps and fans, printing and packaging machinery. It is used for constant torque, high starting torque and speed regulation occasions, and it is a common spare replacement part for old A700 inverter cabinets.