FR-D720S-070-NA is a 0.75 kW single-phase 200 V AC variable frequency drive from Mitsubishi Electric’s FREQROL-D700 series, designed for compact single-phase input applications including small conveyor drives, pump controls, fan speed regulation, and general-purpose motor speed control in light industrial and commercial environments. The «070» in the part number denotes the rated current of 7.0 A output, «S» identifies the single-phase 200 V AC input variant, and «NA» confirms the North American market specification with UL and cUL certification. Available now at Atlantech Drives with worldwide express delivery and 12-month warranty — complete our quote form for pricing and availability.
What Is the FR-D720S-070-NA?
The FR-D720S-070-NA belongs to Mitsubishi Electric’s FREQROL-D720S sub-series, which accepts single-phase 200–240 V AC input and outputs three-phase 200–240 V AC to drive standard three-phase induction motors from a single-phase supply — a significant advantage in residential, light commercial, and retrofit applications where three-phase power is unavailable. The drive delivers a rated output current of 7.0 A, corresponding to a 0.75 kW (1 HP) motor at 200 V, with an overload capacity of 150% for 60 seconds and 200% for 3 seconds to handle motor starting transients. The FR-D720S-070-NA includes a built-in EMC filter (Class C2 equivalent) and a built-in braking transistor for connection of an external braking resistor, enabling controlled deceleration in applications where load inertia would otherwise cause overvoltage trips on rapid speed reductions. Control is via the front-panel parameter unit (FR-PU07 compatible), onboard digital I/O terminals, or an optional RS-485 communication board for Modbus RTU or Mitsubishi’s proprietary CC-Link interface.
Key Technical Specifications
- Rated Output Power: 0.75 kW (1 HP)
- Input Voltage: Single-phase 200–240 V AC, 50/60 Hz
- Output Voltage: Three-phase 200–240 V AC (variable)
- Rated Output Current: 7.0 A
- Overload Capacity: 150% for 60 s / 200% for 3 s
- Output Frequency Range: 0.2–400 Hz
- Control Method: Sinusoidal PWM (V/f control, Advanced magnetic flux vector)
- Built-in EMC Filter: Yes (Class C2 equivalent)
- Built-in Braking Transistor: Yes (external resistor required)
- Communication: RS-485 (via optional FR-D7xS-02-NA option board) — Modbus RTU, Mitsubishi protocol
- Digital Inputs: 4 (STF, STR, RH, RM/RL — programmable)
- Analogue Input: 0–5 V DC / 0–10 V DC / 4–20 mA (terminal 2 and 4)
- Certification: UL 508C, cUL, CE
- Ambient Operating Temperature: -10 °C to +50 °C (no condensation)
- Dimensions (W × H × D): 68 × 128 × 112 mm
- Weight: Approx. 0.8 kg
Typical Industrial Applications
The FR-D720S-070-NA is particularly valued in retrofit and small machine applications where single-phase 200 V power is the only available supply. In commercial kitchen ventilation, the drive controls exhaust fan speed based on a 0–10 V DC analogue signal from a CO₂ or temperature sensor, reducing noise and energy consumption during low-demand periods without the cost of a three-phase power installation. In small woodworking and metalworking shops, the drive enables variable speed control of three-phase spindle motors and dust extraction fans powered from a standard single-phase workshop supply. In agricultural irrigation systems, the FR-D720S-070-NA drives submersible pump motors at variable speed to match flow demand, avoiding the mechanical stress of across-the-line starting on pump impellers and reducing peak current demand on rural single-phase supply networks. In conveyor and material handling applications at mezzanine loading stations, the built-in braking transistor — connected to an FR-ABR braking resistor — provides controlled deceleration of loaded belt conveyors without the overvoltage faults that occur when load inertia back-feeds energy into the DC bus during deceleration. The advanced magnetic flux vector control mode improves low-speed torque performance compared to basic V/f drives, making the FR-D720S-070-NA suitable for constant-torque loads such as extruders and mixers that require full torque at speeds below 10 Hz.
Expert Tips
When connecting a three-phase motor to the FR-D720S-070-NA from a single-phase supply, verify that the motor’s nameplate current rating does not exceed the drive’s 7.0 A output rating — the drive output rating, not the motor kW rating, is the binding constraint. Single-phase input drives have a higher input current than equivalent three-phase input drives for the same output power; the FR-D720S-070-NA draws approximately 9.8 A from the single-phase supply at full load, so the upstream circuit breaker and wiring must be sized for this input current, not the motor current. For Modbus RTU communication, the optional FR-D7xS-02-NA communication board must be installed — the base unit has no serial communication terminals. Modbus RTU register mapping for FR-D700 series drives follows Mitsubishi’s FR-D700 Instruction Manual Appendix, which differs from the standard Modbus register conventions used by some SCADA drivers; always use Mitsubishi’s published register table rather than generic Modbus VFD templates. If the drive trips on E.OV3 (overvoltage during deceleration) with the braking transistor enabled, the connected braking resistor value is too high — reduce the resistance value to increase the braking energy dissipation rate, staying within the minimum resistance value specified in the FR-D720S hardware manual for the 0.75 kW frame to avoid transistor damage.
Frequently Asked Questions
Q: Can the FR-D720S-070-NA accept three-phase input if single-phase power is not available?
A: No. The FR-D720S sub-series is designed exclusively for single-phase input. For three-phase 200 V AC input at 0.75 kW, the correct model is the FR-D720-070-NA (without the «S» suffix). The input rectifier and capacitor bank in the FR-D720S are sized for single-phase current; connecting three-phase input will result in incorrect DC bus voltage and potential component damage.
Q: Does the FR-D720S-070-NA support encoder feedback for closed-loop speed control?
A: No. The FR-D720S series supports open-loop V/f and advanced magnetic flux vector control only — it does not have an encoder input. For closed-loop vector control with encoder feedback (required for precise speed regulation at low speeds or for torque control applications), Mitsubishi recommends the FREQROL-A800 or F800 series with the optional encoder feedback board.
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