Mitsubishi FR-D720-0.4K | FR-D700 Series Variable Frequency Drive (VFD)

Product Overview

The FR-D720-0.4K (FRD72004K) is a compact, high-performance micro-inverter from Mitsubishi Electric’s FR-D700 series. Designed for an applicable motor capacity of 0.4 kW (1/2 HP), this drive is the industry standard for small-scale automation where space is at a premium but reliability is non-negotiable.

The FR-D720 series features advanced General-purpose Magnetic Flux Vector Control, which ensures high starting torque (150% at 1 Hz) for demanding loads like conveyors, packaging machines, and fans. With integrated safety functions (Safe Torque Off) and a specialized spring-clamp terminal architecture for vibration-resistant wiring, the FR-D720-0.4K provides a sophisticated yet user-friendly solution for three-phase motor control using a 200V input.

Technical Configuration

The FR-D700 series is engineered for longevity and ease of integration:

• Magnetic Flux Vector Control: Provides excellent torque performance even at low speeds, ensuring smooth startups for heavy mechanical loads.

• Built-in Safety Function: Includes an integrated emergency stop circuit (Safe Torque Off) that complies with global safety standards, reducing the need for external contactors.

• Compact "Side-by-Side" Mounting: The ultra-slim design allows multiple inverters to be installed touching each other, significantly reducing cabinet size.

• Spring-Clamp Terminals: High-reliability control terminals that simplify wiring and ensure maintenance-free operation in high-vibration environments.

• Enhanced Reliability Components: Equipped with long-life cooling fans (10-year design life) and capacitors, minimizing the total cost of ownership.

Technical Specifications

Technical FAQs

Can I run this 3-phase inverter on a single-phase 220V household supply?

The FR-D720 is specifically rated for a 3-phase input. While the inverter will technically power up on single-phase power, it will likely trigger a "Phase Loss" or "Under-voltage" alarm (UVT) under load. For dedicated single-phase 220V input applications, the FR-D720S series is the appropriate choice.

How do I adjust the motor speed manually?

The drive features an integrated "Digital Dial" on the front cover. Simply turn the dial to adjust the frequency (Hz) and press the center of the dial to "SET" the value. Alternatively, you can connect an external 5k Ohm potentiometer to terminals 10, 2, and 5.

What should I do if I see an "E.OC1" error?

E.OC1 indicates "Overcurrent during acceleration." This usually happens if the acceleration time (Parameter 7) is too short for the load or if the motor is stalled. Try increasing the acceleration time or checking the motor for mechanical blockages.

Engineering & Installation Guide

Wiring and Terminal Protection

Use the integrated spring-clamp terminals for control signals to ensure they do not vibrate loose over time. For the main power (R/L1, S/L2, T/L3) and motor output (U, V, W), ensure you use insulated crimp terminals. To comply with EMC directives, keep the motor cable as short as possible and use shielded cable if the VFD is located near sensitive sensors.

Parameter Commissioning

For most standard applications, you only need to set three basic parameters:

1. Pr. 1 (Maximum Frequency): Set to match your motor's rated speed (e.g., 60 Hz).

2. Pr. 7 (Acceleration Time): Default is 5s; increase if the motor starts too abruptly.

3. Pr. 9 (Electronic Thermal Overload): Set this to the rated current listed on your motor's nameplate to prevent burnouts.

Thermal Considerations

Since the 0.4K model is self-cooling (natural convection), it does not have an internal fan. It relies on the ambient air inside the cabinet. Ensure the drive is mounted vertically and maintain a clearance of at least 5 cm above and below the unit. If the cabinet ambient temperature exceeds 40°C, consider adding an external ventilation fan to the enclosure.