The FR-D720-070-NA is Mitsubishi Electric’s 1.5 kW single-phase 200 V input compact inverter from the FREQROL FR-D700 series — providing variable frequency drive for three-phase AC motors at 1.5 kW continuous rated output (7.0 A) from a single-phase 200–240 VAC power supply, the mid-range model in the FR-D720 single-phase 200 V sub-series designed for cost-effective variable speed motor control in light-duty machine automation, conveyor drives, and HVAC fan applications where the FR-D700’s simplified feature set and competitive pricing are preferred over the more advanced FR-E700 or FR-A700 series. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the FR-D720-070-NA?
The FR-D720-070-NA is a FREQROL FR-D700 series variable frequency inverter providing 1.5 kW rated output from single-phase 200–240 VAC input — the «D720» designating the FR-D700 series with single-phase 200 V input, «070» the capacity code corresponding to 1.5 kW rated output (7.0 A continuous), and «NA» identifying the North American UL/cUL-certified specification. The FR-D700 series is Mitsubishi’s entry-level VFD range, positioned below the FR-E700 (with advanced magnetic flux vector control and built-in RS-485 Modbus) for applications where basic V/F (volts-per-hertz) speed control is adequate and the advanced functions of the FR-E700 are not required. The FR-D720-070-NA implements V/F control with optional simple magnetic flux vector control enabling improved low-speed torque compared to pure V/F — adequate for general-purpose conveyor, fan, and pump loads where precise speed regulation is not critical. The built-in operation panel provides frequency setting, run/stop control, and parameter access directly on the inverter front panel. Digital inputs (3 programmable), analog speed reference input (0–5 VDC or potentiometer), and relay output provide the basic machine interface capability for standalone variable speed operation — unlike the FR-E700 series, the FR-D700 does not include built-in RS-485 Modbus RTU communication as standard, requiring the optional FR-A7NC or similar communication option for network integration.
Key Technical Specifications
- Model: FR-D720-070-NA
- Rated Output Power: 1.5 kW
- Rated Output Current: 7.0 A
- 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: V/F control (simple magnetic flux vector optional)
- Digital Inputs: 3 programmable inputs
- Analog Inputs: 1 speed reference (0–5V or potentiometer)
- Digital Output: 1 relay contact
- Communication: None built-in (optional RS-485 communication card available)
- 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. 0.8 kg
Series Comparison & Selection Guide
The FREQROL FR-D700 series is Mitsubishi’s entry-level VFD range, differentiated from the FR-E700 and FR-A800 by its simplified control and reduced built-in functionality — the key differences that determine which series to specify. The FR-D720-070-NA (FR-D700, 1.5 kW, single-phase 200 V) provides basic V/F variable speed control with 3 digital inputs, 1 analog input, and 1 relay output — adequate for simple variable speed applications where speed accuracy is not critical and PLC communication is not required. The equivalent FR-E700 model (FR-E720-080-NA, 1.5 kW, single-phase 200 V) adds advanced magnetic flux vector control for improved low-speed torque, built-in RS-485 Modbus RTU for PLC integration, 5 digital inputs versus 3, and a wider frequency setting range — at higher cost. For straightforward single-phase 1.5 kW applications where PLC communication is not required and V/F speed control is adequate (fans, pumps, conveyors with consistent loads), the FR-D720-070-NA’s lower cost makes it the appropriate selection. For applications requiring Modbus RTU PLC integration, torque accuracy at low speed (below 20 Hz), or 5-input terminal configuration, the FR-E720-080-NA is the correct specification. Above 2.2 kW single-phase output, the FR-D720 series does not extend — for 1.5 kW three-phase 400 V supply applications, the FR-D740-070-NA provides equivalent functionality from three-phase input.
Maintenance Tips
The FR-D720-070-NA’s cooling fan (present on 1.5 kW and larger models) has a rated bearing life of approximately 30,000 hours at 40°C ambient — replace the fan every 3–4 years in continuous-duty applications regardless of observed condition to avoid overtemperature shutdown from fan bearing failure. The cooling fan is accessible from the inverter rear panel — verify the replacement fan’s air flow direction matches the original (intake from bottom, exhaust from top) before installation, as reverse-orientation fans provide significantly reduced cooling effectiveness. The DC bus electrolytic capacitors in the FR-D720-070-NA have a rated service life of approximately 10 years at 40°C ambient — for inverters above 7 years of service, monitor for signs of capacitor degradation: increased output voltage ripple, unexplained trip events at startup or under heavy load acceleration, and visible physical bulging of capacitor tops visible through the inverter’s ventilation openings. For FR-D720-070-NA units operating in high-temperature environments (ambient above 40°C), reduce the inverter’s carrier frequency (parameter Pr.72) to the minimum acceptable for the application — lower carrier frequency reduces IGBT switching losses and heat generation, extending capacitor and IGBT junction temperature within the thermal limits. Maintain the inverter’s air intake filter (if installed in a panel with filter) on a monthly inspection schedule — a clogged intake filter causes the inverter’s internal temperature to rise above the rated limit even when the ambient temperature is within specification, generating overtemperature (OHT) alarms during normal operation.
Frequently Asked Questions
Q: Can the FR-D720-070-NA be used to drive a 1.5 kW motor from a single-phase 120 VAC supply?
A: No. The FR-D720-070-NA is rated for 200–240 VAC single-phase input — 120 VAC single-phase input is outside the specified input voltage range and would result in inadequate DC bus voltage for proper motor control at rated speed. For 120 VAC supply applications, a step-up transformer to 200–240 VAC is required before the FR-D720-070-NA input, or a 120 VAC-rated inverter (if available from the product line) should be specified.
Q: What is the difference in output current between the FR-D720-070-NA (1.5 kW) and the next model up FR-D720-100-NA (2.2 kW)?
A: The FR-D720-070-NA provides 7.0 A rated output current at 1.5 kW; the FR-D720-100-NA provides 10.0 A at 2.2 kW. For a motor with nameplate rated current of 7.0 A or below, the FR-D720-070-NA is the correctly sized inverter. If the motor’s rated current exceeds 7.0 A (which would indicate a motor rated above 1.5 kW at 200 V), the FR-D720-100-NA or larger must be specified — using an undersized inverter causes persistent OC (overcurrent) or OL (overload) trips at rated motor load.
Q: Does the FR-D720-070-NA support regenerative braking for loads that overspeed the motor during deceleration?
A: The FR-D720-070-NA includes a built-in braking transistor circuit that activates during motor deceleration to dissipate regenerative energy in an external braking resistor — connect an appropriate external braking resistor to the P and PR terminals on the FR-D720-070-NA for regenerative braking capability. Without an external braking resistor, regenerative energy during deceleration raises the DC bus voltage until the OV (overvoltage) protection activates and trips the inverter, preventing controlled motor deceleration on high-inertia loads.
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