FR-D740-160-NA is a 7.5 kW three-phase 400 V AC variable frequency drive from Mitsubishi Electric’s FREQROL-D700 series, providing robust motor speed control for medium-duty industrial applications including pumps, fans, compressors, and conveyor systems operating on 380–480 V AC three-phase supplies. The «160» in the part number denotes the rated output current of 16.0 A, «D740» identifies the three-phase 400 V class variant of the D700 series, and «NA» confirms North American UL/cUL certification. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the FR-D740-160-NA?
The FR-D740-160-NA is the 7.5 kW member of the FREQROL-D740 three-phase 400 V drive family. Compared to the FR-D720S-070-NA single-phase variant, the FR-D740 series operates on three-phase 380–480 V AC input, accepts a significantly higher power motor load, and is constructed in a larger frame body with enhanced thermal management for continuous industrial duty. At 7.5 kW, the FR-D740-160-NA is positioned at the upper end of the D700 series power range — above this power level, Mitsubishi’s FREQROL-E800 or A800 series provide the appropriate platform with enhanced communication and control features. The drive’s 16.0 A rated output current delivers 150% overload for 60 seconds and 200% for 3 seconds, handling motor starting in high-inertia applications. The built-in braking transistor allows direct connection of an external braking resistor (FR-BR or FR-ABR series) for applications requiring rapid deceleration, such as textile winders and centrifuge drives. Unlike smaller D700 frame sizes, the FR-D740-160-NA does not include a built-in EMC filter as standard — an external line filter (FR-BSF01 or equivalent) must be specified separately when CE or UL EMC compliance is required for the installation.
Key Technical Specifications
- Rated Output Power: 7.5 kW
- Input Voltage: Three-phase 380–480 V AC, 50/60 Hz
- Output Voltage: Three-phase 380–480 V AC (variable)
- Rated Output Current: 16.0 A
- Overload Capacity: 150% for 60 s / 200% for 3 s
- Output Frequency Range: 0.2–400 Hz
- Control Method: Sinusoidal PWM (V/f, Advanced magnetic flux vector)
- Built-in EMC Filter: Not included (external filter required for EMC compliance)
- Built-in Braking Transistor: Yes (external resistor required)
- Communication: RS-485 via optional FR-D7x-02-NA option board (Modbus RTU, Mitsubishi protocol)
- Digital Inputs: 4 programmable (STF, STR, RH, RM/RL)
- Analogue Input: 0–5 V / 0–10 V / 4–20 mA
- Certification: UL 508C, cUL, CE (without EMC filter)
- Ambient Operating Temperature: -10 °C to +50 °C
- Dimensions (W × H × D): 108 × 260 × 121 mm
- Weight: Approx. 2.2 kg
Compatibility & System Integration
The FR-D740-160-NA is compatible with standard IEC and NEMA three-phase induction motors rated at 7.5 kW / 10 HP at 400–480 V. For permanent magnet (IPM) motor control, the FR-D700 series does not support IPM motor vector control — this requires upgrading to the FR-F800 (fan/pump) or FR-A800 (general purpose) series with the IPM motor control parameter set. The drive’s analogue input (terminal 2: 0–10 V or 4–20 mA; terminal 4: 4–20 mA with AU signal) integrates directly with standard PLC analogue output modules such as the Mitsubishi Q62DA or third-party 4–20 mA DAC outputs for remote speed reference, enabling closed-loop process control when combined with a flow or pressure transmitter feedback signal processed in the PLC. For network-integrated installations, the optional FR-D7x-02-NA board adds an RS-485 port supporting Modbus RTU (up to 247 slave addresses, 19,200 bps maximum) and Mitsubishi’s proprietary computer link protocol, allowing the drive to be controlled and monitored from a SCADA system, Q-series PLC with QJ71C24N serial module, or a Modbus RTU master without additional gateway hardware. The FR-D740-160-NA’s relay output (terminals A, B, C) provides a fault output signal compatible with PLC digital input modules for integration into machine safety and alarm management systems.
Maintenance Tips
The FR-D740-160-NA contains electrolytic capacitors on the DC bus whose capacitance degrades over time, typically requiring replacement after 10 years of continuous operation at rated load and 40 °C ambient. Mitsubishi provides a capacitor life estimation function accessible via the drive’s parameter monitor (Pr.259 — capacitor life display) which estimates remaining capacitor life based on accumulated operating time and thermal history; monitor this parameter during annual maintenance inspections and plan a drive replacement or capacitor reconditioning service before the estimated life expires. Clean the cooling fins and internal fan annually in dusty environments — blocked airflow is the leading cause of premature drive failure due to thermal overstress of the IGBT module. The internal cooling fan on the FR-D740-160-NA frame is field-replaceable; Mitsubishi publishes the replacement fan part number in the FR-D700 Maintenance Manual and recommends replacement every 10 years or when the fan bearing noise becomes audible. If the drive displays E.THM (motor thermal protection trip) repeatedly despite correct motor sizing, verify that the motor thermal time constant parameter (Pr.9 — Electronic thermal O/L relay) is set to the motor nameplate current, not the drive’s rated current — a common misconfiguration that causes nuisance thermal trips on lightly loaded motors with long acceleration ramps.
Frequently Asked Questions
Q: Does the FR-D740-160-NA include a built-in EMC filter, and is one required for CE compliance?
A: The FR-D740-160-NA at 7.5 kW does not include a built-in EMC filter. For CE compliance with EN 61800-3 Category C2 (industrial environment, second environment), an external line filter such as the Mitsubishi FR-BSF01 or a third-party equivalent must be installed on the input supply. For Category C1 compliance (residential environment, first environment), a higher-attenuation filter and additional shielded cable practices are required — consult the FR-D700 EMC Installation Guidelines for the specific filter selection table by drive frame size.
Q: Can the FR-D740-160-NA be used for pump control with automatic PID regulation?
A: Yes. The FR-D700 series includes a built-in PID controller (activated via Pr.128 — PID action selection) that accepts a process variable feedback signal on the analogue input terminal 4 (4–20 mA) and a setpoint from terminal 2 or a fixed parameter value, automatically adjusting output frequency to maintain the target process value. This eliminates the need for an external PLC PID function block for simple single-loop pressure or flow control applications, though more complex multi-loop or cascade control still requires a PLC.
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