Mitsubishi FR-D740-3.7K-CHT FREQROL-D700 3.7kW 3‑Phase 400V AC Drive

Mitsubishi Electric FREQROL-D700 FR-D740-3.7K-CHT is a compact high‑performance frequency inverter for controlling three‑phase induction motors. Rated output 3.7 kW (5 HP) at 380‑480 V, 3‑phase input. General‑purpose magnetic flux vector control delivers 150% starting torque at 1 Hz for demanding low‑speed applications. Built‑in brake transistor, RS‑485 Modbus‑RTU communication, and Safe Torque Off (STO) safety function. IP20 enclosure, forced air cooling.

Applications:

• Fan, pump, and blower speed regulation in HVAC and water treatment

• Conveyor and material handling systems

• Packaging machinery and food processing equipment

• Textile and woodworking machinery

• General OEM machine automation

Core Specifications:

• Motor power: 3.7 kW (5 HP)

• Output current: 8.0 A

• Output capacity: 7.2 kVA

• Input voltage: 3‑phase 380‑480 V AC, 50/60 Hz (permissible fluctuation 325‑528 V AC)

• Output voltage: 3‑phase 380‑480 V AC (max.)

• Output frequency range: 0.2–400 Hz

• Overload capacity: 150% for 60 s, 200% for 0.5 s (inverse‑time characteristic)

• Control methods: V/F control, general‑purpose magnetic flux vector control, optimum excitation control

• Starting torque: ≥150% at 1 Hz (vector control)

• Built‑in brake transistor: Yes

• Safety function: STO (Safe Torque Off) – SIL2/PLd (EN ISO 13849‑1 Category 3, EN 62061, IEC 61508)

• Communication interface: RS‑485 (Modbus‑RTU, Mitsubishi inverter protocol)

• Terminal block type: Screw clamp

• Enclosure rating: IP20

• Cooling method: Forced air cooling

• Dimensions (W × H × D): 108 mm × 128 mm × 165.5 mm

• Weight: approx. 1.5 kg

• Operating temperature: –10 °C … +50 °C

Advanced Specifications:

• Carrier frequency: Soft‑PWM / adjustable high carrier frequency PWM

• Acceleration/deceleration time: 0.1–3600 s (linear or S‑curve)

• Multi‑speed operation: Up to 16 pre‑set speeds

• PID control: Built‑in for closed‑loop process control

• Auto‑tuning: Offline auto‑tuning for motor parameters

• Functions: 15‑segment speed setting, triangular wave function, regeneration avoidance, slip compensation, droop control, password protection

• Protection functions: Overcurrent, overvoltage, undervoltage, overload (electronic thermal), output short‑circuit, earth fault, heatsink overheat, input phase loss, output phase loss, CPU fault, brake transistor alarm

• Parameter setting tools: FR Configurator (PC software via RS‑485)

System Integration:

• This inverter belongs to the Mitsubishi Electric FREQROL‑D700 series.

• Three‑phase 380‑480 V AC input directly supplies three‑phase output for standard induction motors.

• RS‑485 communication via PU connector supports Modbus‑RTU and Mitsubishi inverter protocol for parameter setting, monitoring, and control.

• Parameter setting and monitoring via integrated digital dial/keypad, optional FR Configurator software, or FR‑PA07 enclosure surface operation panel.

Standards & Compliance:
Refer to manufacturer official documentation for certification and compliance details.

Related Products:

• FR‑PA07 – Enclosure surface operation panel (optional, requires FR‑CB20□ connection cable)

• FR‑PU07 – Parameter unit with numeric keypad and multi‑language display (optional)

• FR‑CB20□ – Parameter unit connection cable

• FR‑ABR‑1.5K – Braking resistor for FR‑D700 series (3.7 kW)

• FR‑D700 series DC reactor – Optional for harmonic suppression