The FR-E720-050-NA is Mitsubishi Electric’s 0.75 kW single-phase 200 V input compact inverter from the FREQROL FR-E700 series — providing variable frequency drive capability for three-phase AC motors at 0.75 kW continuous rated output (4.0 A) from a single-phase 200–240 VAC power supply with advanced magnetic flux vector control, built-in RS-485 Modbus RTU communication, and comprehensive machine interface capability, the most widely specified FR-E720 model for general-purpose single-phase 200 V variable speed motor drive applications. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the FR-E720-050-NA?
The FR-E720-050-NA is a FREQROL FR-E700 series variable frequency inverter providing 0.75 kW rated output from single-phase 200–240 VAC input — the «050» capacity code corresponding to 0.75 kW rated output (4.0 A continuous output current, 5.0 A overload at 150% for 60 seconds). As the 0.75 kW model in the FR-E720 single-phase 200 V sub-series, the FR-E720-050-NA sits between the 0.4 kW FR-E720-025-NA and the 1.5 kW FR-E720-080-NA — covering the extremely common 0.75 kW motor size used in standard conveyor drives, single-phase HVAC fan units, small pump drives, and auxiliary machine axes across virtually every manufacturing sector. The FR-E720-050-NA implements Mitsubishi’s advanced magnetic flux vector control providing accurate torque generation at low speed — superior to V/F control for applications requiring high torque at starting or at speeds below 10 Hz, such as conveyor drives carrying product loads from rest, pump systems requiring full torque at low speed for priming, and positioning axes requiring precise low-speed operation. The built-in RS-485 port enables Modbus RTU communication for PLC integration (FX5U, FX3U, Q-series, or third-party PLC with Modbus master capability) without an optional communication card — enabling remote speed command, start/stop control, and status monitoring from the PLC via RS-485 network rather than dedicated analog and digital I/O wiring per inverter. The «NA» suffix confirms UL/cUL certification for North American market installations.
Key Technical Specifications
- Model: FR-E720-050-NA
- Rated Output Power: 0.75 kW
- Rated Output Current: 4.0 A (continuous), 5.0 A (150% overload for 60 s)
- Input Power Supply: Single-phase 200–240 VAC, 50/60 Hz
- Output Voltage: Three-phase 200–240 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. 0.7 kg
Compatibility & System Integration
The FR-E720-050-NA integrates with Mitsubishi MELSEC PLC systems via its built-in RS-485 Modbus RTU port — the FX5U’s built-in RS-485 port, the FX3U-485-BD option board, and the MELSEC-Q QJ71C24N-R4 serial communication module all act as Modbus RTU masters, reading the FR-E720-050-NA’s output frequency, current, and fault status and writing speed commands and run/stop control. For multi-inverter RS-485 networks, multiple FR-E720-050-NA inverters (up to 31 units) connect to a single RS-485 bus with individual station addresses configured via inverter parameter Pr.117 — enabling a single FX3U or FX5U PLC to control multiple conveyor or pump drives via Modbus RTU polling without separate analog wiring per drive. The FR-E720-050-NA’s 5 digital inputs support multiple control functions: Forward run (STF), Reverse run (STR), High-speed command (RH), Medium-speed command (RM), and Multi-speed selection or external reset (RL/MRS) — all programmable via the inverter’s extensive parameter set. For Mitsubishi GOT HMI integration, the FR-E720-050-NA communicates with GOT2000 and GOT1000 panels via the built-in RS-485 port using the FR-E700 communication driver available in GT Designer3, enabling inverter parameter display, frequency monitoring, run/stop control, and alarm history from the GOT panel without a dedicated PLC intermediary. The FR-E720-050-NA is also compatible with the FR-PA07 remote parameter unit for handheld commissioning and parameter backup at distances up to 20 metres from the inverter via RJ45 extension cable.
Maintenance Tips
The FR-E720-050-NA at 0.75 kW does not include a cooling fan — natural convection cooling from the heatsink fins handles the heat dissipation at this power level. Despite the absence of a fan, ensure the inverter’s installation allows minimum 50 mm clearance above and below the heatsink for convection airflow — blocking convection airflow by mounting in a sealed enclosure without ventilation or installing with adjacent components too close above/below causes the inverter to overheat and generate OH (overtemperature) alarms at ambient temperatures that the correctly installed unit handles without alarm. The DC bus electrolytic capacitors in the FR-E720-050-NA have a rated service life of approximately 10 years at 40°C ambient — for units approaching 7–10 years of service, increase the inspection frequency and watch for early degradation indicators: AL.E.3 (DC bus overvoltage) tripping at normal deceleration loads, unusual humming from the DC bus at idle, or visible capacitor top bulging. For the FR-E720-050-NA installed in outdoor or humid environments with the panel door sealed, verify panel humidity remains below 95% RH non-condensing — condensation inside the inverter causes corrosion of the circuit board and connector contacts, which manifests as intermittent faults that are difficult to reproduce during dry weather maintenance visits. Install desiccant packets in sealed outdoor panels containing FR-E720-050-NA inverters and replace desiccant every 6 months in high-humidity environments.
Frequently Asked Questions
Q: Can the FR-E720-050-NA be used to control a single-phase 0.75 kW motor (not three-phase)?
A: No. The FR-E720-050-NA accepts single-phase 200 VAC input but generates three-phase variable frequency AC output — the connected motor must be a three-phase AC induction motor rated for 0.75 kW at 200 VAC three-phase. Single-phase capacitor-start, capacitor-run, or shaded-pole motors cannot be connected to the FR-E720-050-NA output — single-phase motor windings are not designed for VFD operation and will be damaged. The FR-E720-050-NA enables three-phase motor operation from a single-phase supply, which is its primary application advantage.
Q: What is the difference between the FR-E720-050-NA (0.75 kW, single-phase input) and the FR-E740-050-NA (0.75 kW, three-phase 400 V input)?
A: Both models provide 0.75 kW output to the motor and include identical control features (magnetic flux vector control, Modbus RTU RS-485, 5 digital inputs). The FR-E720-050-NA accepts single-phase 200–240 VAC input — appropriate when only single-phase supply is available at the installation. The FR-E740-050-NA requires three-phase 380–480 VAC input — appropriate for three-phase 400 V supply installations. At 0.75 kW, the FR-E720-050-NA draws approximately 5 A single-phase from a 200 V supply; the FR-E740-050-NA draws approximately 1.5 A per phase from a 400 V three-phase supply — the three-phase variant provides more balanced supply loading and is preferred in three-phase supply facilities.
Q: How many FR-E720-050-NA inverters can be controlled on a single RS-485 Modbus RTU network from an FX5U PLC?
A: Up to 31 FR-E720-050-NA inverters can be connected to a single RS-485 bus as Modbus RTU slaves — each inverter assigned a unique station address (Pr.117 = 1 to 31). The FX5U’s built-in RS-485 port acts as the Modbus RTU master, polling each inverter sequentially. At 9,600 bps with 31 inverters, the round-trip polling cycle for all inverters takes approximately 3–5 seconds depending on the number of registers polled per inverter — adequate for monitoring and low-frequency speed adjustments, but not for real-time dynamic speed control requiring sub-second response. For faster RS-485 response, increase the baud rate to 19,200 or 38,400 bps (verify the FX5U and FR-E720-050-NA parameter settings match).
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