The Mitsubishi FR-A540-3.7K is a 3-phase transistorized inverter delivering 3.7 kW (5 HP) motor output with variable frequency control across 0.2 to 400 Hz. Engineered for industrial motor speed regulation, this AC drive accepts 380–480 VAC input at 50/60 Hz and outputs rated current of 9 A. Advanced magnetic flux vector control provides high-torque performance from ultra-low speeds, stabilized by on-line auto-tuning via RISC processor. The drive supports keypad programming, RS-485 communication, and up to three internal option cards for PLC integration including CC-Link protocol. Soft-PWM control minimizes acoustic noise. Housed in an IP20 enclosure measuring 150 mm W × 260 mm H × 140 mm D (7.50 lbs), it operates at ambient temperatures to 50°C with forced-air cooling.
Technical Specifications
• Motor Output: 3.7 kW (5 HP)
• Input Power: 3-phase, 380–480 VAC, 50/60 Hz
• Output Frequency: 0.2–400 Hz
• Rated Output Current: 9 A (120% and 150% overload rated)
• Output Voltage: Proportional to input voltage
• Control Method: Magnetic flux vector control with soft-PWM
• Enclosure Rating: IP20
• Dimensions: 150 mm W × 260 mm H × 140 mm D (10.20 × 5.90 × 5.50 in)
• Weight: 3.5 kg (7.50 lbs)
• Maximum Ambient Temperature: 50°C (up to 450 K); 40°C (530–1050 K)
• Cooling: Forced air
– Key Features
• Advanced flux vector control ensures high-precision speed regulation independent of motor temperature
• Ultra-low speed high-torque delivery from 0.2 Hz
• On-line auto-tuning for rapid motor parameter optimization
• Parameter user group function for selective parameter control
• Soft-PWM control suppresses acoustic noise
– Typical Applications
Variable speed motor control in industrial process control, pump/fan drives, conveyor systems, and machinery requiring precise low-speed torque.
– Compatibility & Integration
• Keypad interface with programmable parameters
• RS-485 communication port
• Three internal option card slots
• PLC integration via CC-Link protocol
• Support for pulse train, analog, and digital I/O signals
