The FR-E740-026-NA is Mitsubishi Electric’s 0.4 kW three-phase 400 V input compact inverter from the FREQROL FR-E700 series — a 0.4 kW capacity model in the FR-E740 380–480 VAC three-phase input sub-series, providing variable frequency drive for three-phase AC motors at 0.4 kW continuous rated output (1.0 A) in industrial automation applications where three-phase 400 V supply is the installation standard. The FR-E740-026-NA is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the FR-E740-026-NA?
The FR-E740-026-NA is a FREQROL FR-E700 series variable frequency inverter providing 0.4 kW rated output from a three-phase 380–480 VAC input — the «E740» designating the FR-E700 series with three-phase 380–480 V input, «026» the capacity code corresponding to 0.4 kW rated output (1.0 A continuous), and «NA» identifying the North American specification with UL/cUL certification. As the 0.4 kW model in the FR-E740 three-phase sub-series, the FR-E740-026-NA sits above the 0.1 kW FR-E740-008-NA and 0.2 kW FR-E740-015-NA in the series, providing the additional output capacity required for 0.4 kW motor applications including small conveyor drives, cooling fan and pump drives, and auxiliary machine axes where three-phase 400 V supply is the standard industrial supply. Like all FR-E740 models, the FR-E740-026-NA implements Mitsubishi’s advanced magnetic flux vector control for superior low-speed torque performance, and includes the built-in RS-485 Modbus RTU communication port that distinguishes the FR-E700 series from simpler inverters — enabling direct PLC Modbus integration without optional communication cards. At 0.4 kW, the FR-E740-026-NA’s rated output current (1.0 A) is five times higher than the FR-E720-008-NA’s 0.2 A, providing proportionally more motor current for the larger motor frame while the three-phase input distributes the supply current across three phases for balanced loading on the 400 V supply infrastructure.
Key Technical Specifications
- Model: FR-E740-026-NA
- Rated Output Power: 0.4 kW
- Rated Output Current: 1.0 A
- Input Power Supply: Three-phase 380–480 VAC, 50/60 Hz
- Output Voltage: Three-phase 380–480 VAC (variable frequency)
- Output Frequency Range: 0.2–400 Hz
- Control Method: Advanced magnetic flux vector (sensorless), V/F selectable
- Digital Inputs: 5 programmable inputs (24 VDC)
- Analog Inputs: 1 speed reference (0–5V, 0–10V, 4–20mA selectable)
- Digital Output: 1 relay contact + 1 open-collector
- Communication: Built-in RS-485 (Modbus RTU)
- Certifications: UL, cUL (NA variant)
- Protection: IP20
- Operating Temperature: -10°C to 50°C (with derating above 40°C)
- Dimensions (W × H × D): 68 mm × 128 mm × 75.5 mm
- Weight: Approx. 0.55 kg
Typical Industrial Applications
The FR-E740-026-NA at 0.4 kW from three-phase 400 V supply covers a broad range of standard industrial auxiliary drive applications where small motor variable speed control is required with three-phase supply infrastructure. In machine tool auxiliary systems — coolant pump drives, chip conveyor drives, spindle indexing brake release fan drives — the FR-E740-026-NA provides variable speed control for 0.4 kW motors that previously ran at fixed speed on DOL (direct-on-line) starters, enabling energy savings through speed reduction at partial load and improved process control through variable flow rate rather than on/off pump cycling. HVAC supply air and return air fan drives in commercial buildings commonly use 0.4 kW fan motors for zone terminal units and VAV (variable air volume) boxes — the FR-E740-026-NA provides variable speed pressure-responsive control of these fan motors from a building automation system via Modbus RTU, eliminating the energy waste of throttled damper control and the mechanical wear of frequent start-stop cycling. Packaging machine sealing jaw drives, ink pump drives, and product transport belt drives at 0.4 kW use the FR-E740-026-NA for precise speed synchronisation with the main machine drive, with speed commands from the machine controller PLC via analog reference or Modbus RTU. Wastewater treatment dosing pump drives, chemical metering pump drives, and sludge agitation drives at 0.4 kW in three-phase 400 V treatment facilities specify the FR-E740-026-NA for flow rate control proportional to influent flow — the FR-E740-026-NA’s Modbus RTU integration enables flow-proportional dosing pump speed control from the treatment plant SCADA system without separate analog output modules.
Expert Tips
When commissioning the FR-E740-026-NA with a new 0.4 kW motor, perform the offline auto-tuning function (parameter Pr.96 = 1 for offline auto-tuning) with the motor shaft free and the motor power cables connected but the mechanical load disconnected — this enables the inverter to measure the motor’s electrical parameters (resistance, inductance, back-EMF constant) and configure the flux vector control algorithm for optimal torque accuracy. Auto-tuning takes approximately 30 seconds and stores the motor parameters in the FR-E740-026-NA’s internal parameter set — the motor will then operate with improved low-speed torque and reduced speed regulation under load compared to the factory default parameters. For FR-E740-026-NA installations where the inverter is located in a panel with heat-generating equipment (other inverters, transformers, contactors), verify the inverter’s ambient temperature using a thermometer at the inverter’s air intake during worst-case simultaneous loading — if the ambient temperature exceeds 40°C, the FR-E740-026-NA’s rated output current must be derated by approximately 3% per degree Celsius above 40°C. For a 0.4 kW motor drawing 1.0 A rated current at 40°C ambient, the derating at 50°C ambient reduces the continuous rated output to approximately 0.7 A — if the motor load requires the full 1.0 A continuously at this elevated ambient, either a larger FR-E740 model (overrated for the load, allowing derating margin) or panel cooling to reduce ambient temperature is required. When using the FR-E740-026-NA’s built-in RS-485 Modbus RTU for PLC integration, set the inverter’s Pr.79 (Operation mode selection) to allow both external terminal and RS-485 control simultaneously — this enables the PLC to command speed via Modbus while the physical RUN/STOP terminals on the inverter provide local emergency stop override capability, maintaining a hardwired safety stop path independent of the PLC-to-inverter communication link.
Frequently Asked Questions
Q: What is the difference between the FR-E740-026-NA and the FR-E720-025-NA, both rated at 0.4 kW?
A: Both provide 0.4 kW rated output to the motor. The FR-E740-026-NA accepts three-phase 380–480 VAC input, making it appropriate for three-phase 400 V supply installations. The FR-E720-025-NA accepts single-phase 200–240 VAC input, suitable for locations with only single-phase 200 V supply. The three-phase FR-E740-026-NA has lower input current per phase (approximately 1.8 A per phase at 400 V) compared to the single-phase FR-E720-025-NA (approximately 4 A at 200 V), providing more balanced supply loading. Specify the FR-E740-026-NA when three-phase 400 V supply is available; specify FR-E720-025-NA when only single-phase 200 V supply is available at the installation.
Q: Can the FR-E740-026-NA be used with a motor nameplate rated for 380 V as well as a 460 V motor?
A: Yes. The FR-E740-026-NA’s output voltage scales proportionally with the input voltage — at 380 VAC input, the maximum output voltage is 380 VAC; at 460 VAC input, the maximum output is 460 VAC. For a 380 V-rated motor connected to a 460 V supply via the FR-E740-026-NA, the inverter’s output voltage boost (Pr.19 Base frequency voltage) should be configured to limit the maximum output voltage to the motor’s 380 V rating, preventing motor insulation overstress from the higher supply voltage.
Q: Does the FR-E740-026-NA support PID control for process regulation applications such as pressure or temperature control?
A: Yes. The FR-E740-026-NA includes a built-in PID control function (parameters Pr.128–Pr.134) that regulates motor speed to maintain a process variable (pressure, temperature, flow, level) at a setpoint. The process variable feedback connects to the inverter’s analog input terminal (0–5 VDC or 4–20 mA from a pressure transmitter or temperature sensor), the setpoint is set via an analog reference or parameter, and the PID algorithm adjusts motor speed to minimise the error between setpoint and measured value — enabling simple closed-loop process control without a separate PLC PID loop for basic regulation applications.
Do you need more references from this brand? Explore our full catalog of Mitsubishi here: https://atlantechdrives.com/manufacturers/mitsubishi/
