FR-A840-3.7K-1 MITSUBISHI Variable Frequency Inverter 3 X 230V AC -20% +20
FR-A840-3.7K-1 Description
The FR-A840-3.7K-1 is a high-performance, three-phase industrial inverter from Mitsubishi Electric’s FREQROL-A800 series. It is designed for reliable and precise speed and torque control of 3.7 kW induction motors in heavy‑duty and general industrial applications. Equipped with advanced sensorless vector control, high overload capability, and rich communication functions, this drive ensures stable operation, high efficiency, and easy system integration. It is widely used in machinery, material handling, fans, pumps, and various processing equipment requiring high-performance motor control.
FR-A840-3.7K-1 Key Features
- Advanced sensorless vector control for high torque at low speed and precise speed regulation
- Supports V/F control, PM motor control, and multiple control modes to suit different loads
- Strong overload capacity: 150% for 60 seconds and 200% for 3 seconds for heavy-duty operation
- Wide output frequency range up to 590 Hz for high-speed applications
- Built-in RS-485 communication port supporting Modbus RTU and Mitsubishi protocol
- Optional fieldbus compatibility: CC-Link, PROFIBUS, DeviceNet, EtherNet/IP, etc.
- Comprehensive built-in protection: overcurrent, overvoltage, undervoltage, overheating, phase loss, stall prevention, and output short-circuit protection
- Automatic tuning function for quick and accurate motor parameter identification
- User-friendly operation panel with clear parameter setting and status monitoring
- Compact structure with forced-air cooling for stable long-term operation
- High noise immunity and adaptability to harsh industrial environments
FR-A840-3.7K-1 Materials & Applications
Materials
- Housing: High-strength, flame‑retardant engineering plastic (UL94 V-0)
- Heat sink: Extruded aluminum alloy for efficient heat dissipation
- Power devices: High-reliability IGBT power modules
- Internal PCB: Industrial-grade FR-4 glass epoxy board
- Terminals: Nickel-plated copper screw terminals for stable connection
- Cooling system: Long-life DC fan with temperature-controlled speed
Typical Applications
- Conveyors, mixers, crushers, and material handling equipment
- Fans, pumps, compressors, and HVAC systems
- Machine tools, spindles, and feed axes
- Packaging, printing, and textile machinery
- Extruders, winding machines, and tension control systems
- Food and beverage processing equipment
- General industrial machines requiring high-performance drive control
FR-A840-3.7K-1 Important Parameters
| Parameter |
Specification |
| Part Number |
FR-A840-3.7K-1 |
| Brand |
Mitsubishi Electric |
| Series |
FREQROL-A800 |
| Type |
Three-phase industrial inverter |
| Input Voltage |
3-phase AC 380–480 V, 50/60 Hz |
| Applicable Motor Rating |
3.7 kW |
| Rated Output Current |
8.2 A |
| Output Voltage |
0–input voltage (3-phase AC) |
| Output Frequency Range |
0.2–590 Hz |
| Control Method |
Sensorless vector control, V/F control, PM motor control |
| Overload Capacity |
150% for 60 s; 200% for 3 s |
| Starting Torque |
150% at 0.3 Hz (sensorless vector) |
| Cooling Method |
Forced air cooling |
| Protection Degree |
IP20 |
| Operating Temperature |
-10 °C to +50 °C |
| Storage Temperature |
-20 °C to +65 °C |
| Humidity |
5–95% RH (non-condensing) |
| Communication |
RS-485 (Modbus RTU), optional fieldbus |
| Dimensions (W×H×D) |
150 × 260 × 170 mm |
| Weight |
Approx. 4.6 kg |
| Certifications |
CE, UL, cUL, RoHS |
| Status |
In production |
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