1.5 kW Frequency Inverter, 1-Phase 220V to 3-Phase 380V

Ventilation Slots

Deep, evenly spaced ventilation slots run the full height of both side panels, maximizing the cross-sectional area available for airflow without compromising enclosure rigidity. This forced-air circulation keeps power electronics — IGBTs, capacitors, and the control board — within their rated temperature range even during sustained full-load operation. The result is stable performance across an ambient temperature range of –10°C to +40°C and a design life that is not shortened by thermal cycling.

Multi-Function Keypad

The front-panel keypad is laid out for fast, unambiguous operation in a noisy workshop environment. Color-coded buttons separate function groups clearly. The LED display shows output frequency, output current, output voltage, motor RPM, and DC bus voltage in real time. During commissioning, the same display shows parameter codes and values; during a fault, it immediately displays the fault code so the operator can identify and address the cause without connecting a laptop or consulting a log.

Rugged Industrial Casing

The enclosure is fabricated from heavy-gauge cold-rolled steel with a textured powder-coat finish, providing IP20 protection against solid objects and a surface resistant to the oils, cutting fluids, and cleaning agents common in workshop environments. The enclosure does not flex when terminal screws are torqued or when the unit is subject to low-frequency vibration near compressors and heavy machinery. Integrated mounting flanges with pre-drilled holes accept M4 screws directly into a steel panel or DIN-rail adapter bracket. 

Features

1. Dual-Phase and Voltage Conversion: Accepts single-phase 220V–240V and outputs three-phase 380V / 400V / 415V (selectable), eliminating the need for a separate step-up transformer or rotary phase converter.
2. Soft Start — Replaces a Dedicated Soft Starter: Ramps motor current smoothly from zero, cutting starting current to a fraction of the direct-on-line value. This reduces thermal stress on windings, mechanical shock on couplings, and voltage dips on the supply circuit — without the need for a standalone soft starter unit.
3. Terminal Control — Replaces an AC Contactor: Forward, reverse, and stop commands can be wired to external switches or a PLC, replacing the AC contactor arrangement typically used for motor switching. Multi-speed presets (up to 16 segments) support sequenced or zoned operation.
4. Automatic Current Limiting: Actively monitors output current during acceleration and continuous operation, reducing frequency if the load approaches the overload threshold. Prevents nuisance tripping on loads with variable torque demand — compressors cycling on-load, saws entering a cut, pumps against varying head.
5. Automatic Energy Saving: Continuously optimizes the V/F curve based on actual load, reducing magnetizing current and core losses during light-load periods. Particularly effective for centrifugal fans and pumps where load varies with the cube of speed.
6. Automatic Voltage Regulation (AVR): Compensates for input voltage fluctuations, keeping output voltage constant. Protects motors from the heating and efficiency loss caused by undervoltage, and from insulation stress caused by overvoltage — important in rural or industrial areas with unstable grid supply.
7. RS-485 Modbus-RTU Communication: Full remote control and monitoring via Modbus registers: set frequency, start/stop, read output current, voltage, fault codes, and run status.

Use Cases

• Commercial Refrigeration Compressors: Single-phase 220V sites running 1.5 kW compressor motors benefit from soft start (eliminating contactor wear and supply dips) and automatic current limiting (preventing nuisance trips during pressure build-up). The drive's automatic restart function maintains operation after brief power interruptions without manual intervention.
• Dust Extraction and Industrial Ventilation: Variable-speed control of 1.5 kW extraction fans matches airflow to actual process demand — full speed during machining, reduced speed during idle periods — cutting energy consumption and reducing noise compared to fixed-speed operation. AVR protects fan motors on sites with fluctuating supply voltage.
• Agricultural Grain Augers and Feed Conveyors: Remote locations with single-phase supply only can now run three-phase auger motors. Terminal control via an external switch replaces the contactors that would otherwise be required, and multi-step speed presets allow different feed rates to be selected without touching the drive.
• Woodworking Thicknessers and Wide-Belt Sanders: The 1.5 kW rating covers the feed-roller and conveyor drives on medium-size thicknessers. Variable speed allows feed rate to be matched to timber species and cut depth, reducing tear-out and extending abrasive life. Soft start eliminates the mechanical jerk that causes workpiece slippage on belt sanders.

Application Scenarios

Industrial Mixing

CNC Workshop

Agricultural Irrigation

Wood Processing

Q1: Can I use this drive to replace both a soft starter and an AC contactor on an existing installation?

Yes — this is one of the key use cases for this drive. The soft-start ramp replaces a dedicated soft starter, and the FWD/REV/STOP terminal inputs replace the AC contactor and forward/reverse switching arrangement. The result is fewer components in the control panel, simpler wiring, and motor protection built into a single unit.

Q2: My site has an unstable supply voltage — sometimes dropping to 190V. Will the drive still operate?

The drive's input tolerance is 220V ±15%, giving a lower limit of approximately 187V. At voltages below this threshold, the drive may trip on undervoltage. If your supply regularly dips below 200V, consider an upstream voltage stabilizer. The built-in AVR handles normal fluctuations (±15%) without affecting output voltage or motor performance.

Q3: How do I wire an external pressure switch to control a pump automatically?

Connect the normally-open contact of the pressure switch between the FWD terminal and COM. Set P0.03 = 1 (run command from terminal) and P4.08 = 0 (2-wire control mode 1). When pressure falls below the switch setpoint, the contact closes, the drive starts, and ramps the pump up. When pressure is restored and the switch opens, the drive stops. For smooth pressure maintenance without a mechanical switch, use the built-in PID with a pressure transmitter instead.

Q4: Is the output voltage truly 380V, or is it limited by the 220V input?

The drive uses a boost rectifier topology specifically designed for this conversion. The internal DC bus is charged to a voltage higher than the input, and the three-phase inverter stage synthesizes a genuine 380V (line-to-line RMS) output. This is distinct from a standard single-to-three-phase VFD, which can only output voltage equal to or less than its input — and why this model carries a price premium over same-power drives that output 220V three-phase.

Q5: What circuit breaker rating do I need on the input supply?

At 1.5 kW output and approximately 90% efficiency, input power is around 1.67 kW. On a 220V single-phase supply, this corresponds to roughly 7.6 A continuous. Allow for starting transients and recommend a 16 A MCB (Type C characteristic, which tolerates brief inrush currents) on a dedicated circuit. Do not share the circuit with other large loads.