Mitsubishi Electric FR-D720-5.5K FR-D700 Series Variable Frequency Drive

Description

Managing motor speed and torque requirements in demanding industrial configurations, the Mitsubishi Electric FR-D720-5.5K acts as a high-reliability compact micro-drive within the FR-D700 Series. Engineered for three-phase 200V applications, this 5.5 kW digital inverter provides exceptional motor control accuracy through advanced magnetic flux vector control, making it ideal for packaging, conveying, and processing machinery. Its ultra-compact footprint supports side-by-side mounting to maximize control cabinet space efficiency, while integrated Modbus RTU communications ensure seamless integration into factory automation networks.

Features

• Magnetic Flux Vector Control: Achieves reliable starting torque of 150% at ultra-low speeds (1 Hz) for heavy startup loads.
• Integrated Safety Stop: Features emergency stop capabilities compliant with EN ISO 13849-1 Category 3 / PLd for reliable machine interlocks.
• Modbus RTU Built-in: Control and monitor drive parameters over a standard RS-485 serial network via the integrated RJ45 interface.
• Spring Clamp Control Terminals: High-reliability vibration-proof wiring connections that reduce commissioning times.
• Energy Saving Mode: Advanced excitation control dynamically optimizes motor current relative to load demand.

Applications

• Conveyor Systems: Precise acceleration and deceleration control for material handling lines.
• Pumps and Fans: Flow regulation and energy optimization in HVAC and cooling loops.
• Packaging Equipment: Variable speed drive control for continuous feed and wrapping systems.
• Machine Tools: Spindle and feeder speed management for automated production machinery.

Technical Specifications Table

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The FR-D720-5.5K acts as the direct mechanical and functional replacement for the legacy FR-S520-5.5K series. When upgrading, note that the control logic terminal arrangement differs slightly. The default parameter map requires verification, especially regarding terminal assignment settings (Pr. 178 to Pr. 182) if your older application used custom external logic interlocks.

Application Pitfalls & Engineering Notes

When running continuous high-torque applications at low speeds, standard induction motors run hotter due to reduced internal fan speed. To protect the motor, verify that parameter 9 (Electronic thermal O/L relay) is configured to match standard or constant-torque motor curves. For high-inertia loads like large exhaust fans, rapid deceleration can trigger regenerative overvoltage trips (E.OV3). Ensure a deceleration time (Pr. 8) is sufficiently configured, or install an external brake unit and brake resistor, making sure to enable parameter 30 to allow generative absorption.

Commissioning & Wiring Tips

The front-facing RJ45 jack is not an Ethernet port. It is a dedicated RS-485 serial communication port configured for the PU (Parameter Unit) and Modbus RTU communication. Plugging an active Ethernet cable from a switch or router directly into this port will damage the internal transceiver. To ensure reliable communication noise-immunity over longer distances, always use shielded twisted-pair cables with the shield grounded strictly at the controller side.

Installation Guidelines