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

Ventilation Slots

Rows of precision-formed ventilation slots on the side panels work in tandem with the internal cooling fan to channel air continuously through the drive enclosure. 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

Dedicated keys for RUN, FWD (forward), REV (reverse), and STOP allow immediate motor direction and speed changes. The MENU and ENTER keys navigate the parameter tree, while the rotary dial enables fast numeric entry. A QUICK/JOG multifunction key can be reassigned for jogging, frequency switching, or custom shortcuts. The LED display shows output frequency, output voltage, output current, RPM, and fault codes in real time.

Rugged Industrial Casing

The enclosure is formed from heavy-gauge sheet steel with a powder-coat finish, providing IP20 protection against solid foreign objects and resistance to the knocks and vibration common in workshop and light-industrial environments. Reinforced mounting flanges accept standard DIN-rail or panel-mount installation. The robust construction shields internal PCBs and wiring from mechanical stress, ensuring reliable operation in conditions where a consumer-grade device would fail prematurely.

Features

1. Single-Phase In, Three-Phase Out: Accepts 220V–240V single-phase supply and outputs three-phase 380V / 400V / 415V (selectable), making three-phase equipment operable anywhere household power is available.
2. Vector Control for Low-Speed Torque: Sensorless vector control (SVC) maintains rated torque down to 1 Hz, suitable for applications requiring precise speed regulation at low RPM.
3. Built-In PID Controller: Closed-loop control of pressure, flow, or temperature using a standard 0–10V or 4–20mA sensor signal — no external PLC or controller required.
4. Wide Frequency Range: Output frequency adjustable from 0 to 1000 Hz, supporting both standard 50/60 Hz motor operation and high-speed spindle applications.
5. Automatic Voltage Regulation (AVR): Maintains constant output voltage even when the input supply fluctuates, protecting connected motors from voltage stress.
6. Comprehensive Motor Protection: Over-current, over-voltage, under-voltage, overheating, phase loss, and short-circuit protection with up to 30 fault codes and automatic reset.
7. Multiple Speed Control Methods: Keypad, analog voltage (0–10V), analog current (4–20mA), RS-485 Modbus, or 16-segment multi-step speed — combinable and switchable in operation.
8. Automatic Energy Saving: Optimizes the V/F curve in real time based on load, reducing power consumption during light-load periods.

Use Cases

• Water Pumps & Irrigation: Built-in PID enables closed-loop pressure or flow control for single-phase-powered pump installations. Running the pump at variable speed during low-demand periods reduces energy consumption and extends pump life.
• Woodworking Machines: Variable speed control allows precise feed-rate adjustment on lathes, band saws, and planers without mechanical speed changers. Soft start eliminates belt shock on startup.
• Small Air Compressors: Drives reciprocating and rotary compressors up to 0.75 kW, with pressure-switch integration via the FWD/COM terminals for automatic start/stop.
• Ventilation & HVAC Fans: Variable frequency operation matches fan speed to actual ventilation demand, cutting energy use significantly compared to fixed-speed operation.
• CNC Spindles & Machine Tools: Output frequency up to 1000 Hz supports high-speed spindle motors; RS-485 Modbus allows integration with CNC controllers and PLCs.
• Conveyors & Feeders: Soft-start capability eliminates belt jerk, reducing wear on mechanical components. Multi-step speed presets suit multi-zone conveyor systems.
• Food & Beverage Processing: Variable speed mixers, agitators, and auger feeders benefit from precise torque control at low RPM via sensorless vector control.

Application Scenarios

Industrial Mixing

CNC Workshop

Agricultural Irrigation

Wood Processing

Q1: How does this inverter differ from a standard single-to-three-phase VFD?

A standard single-to-three-phase VFD (such as the GK3000-2S series) outputs three-phase voltage at the same level as its input — typically 220V output from a 220V supply. This inverter (GK3000-CS series) steps the output voltage up to 380V, allowing it to drive standard industrial three-phase motors rated at 380V without any additional transformer. If your motor nameplate reads 380V Δ or 380V Y, choose this model.

Q2: Can I connect this inverter to a standard household 220V wall outlet?

Yes, provided the outlet and wiring are rated for the current demand. At 0.75 kW output and typical efficiency, the single-phase input current will be approximately 5–7 A. Verify that the circuit breaker, wiring, and socket are rated accordingly. We recommend a dedicated 10 A or 16 A circuit.

Q3: What output voltages are available?

The standard output is 380V three-phase. Factory configuration for 400V or 415V is available for an additional charge, covering markets where motors are rated at those voltages. Note that 440V and 460V output is supported only when the input supply is 240V.

Q4: Does this drive support closed-loop pressure or flow control for pumps?

Yes. The built-in PID controller accepts a 0–10V or 4–20mA feedback signal from a standard pressure or flow transmitter. No external controller is needed. Set the target setpoint via the keypad or analog input, connect the sensor to the AI1 terminal, and the drive will automatically adjust motor speed to maintain the target.

Q5: Can the motor run in reverse?

Yes. Press the REV key on the keypad or wire an external normally-open contact to the REV terminal to switch motor direction. Forward and reverse acceleration and deceleration times are independently configurable.

Q6: What protections are built in?

The drive includes over-current, over-voltage, under-voltage, overheating, phase loss, short-circuit, motor overload, and stall protection. Up to 30 fault codes are logged with operating-state snapshots, and the automatic reset function can restart the drive after a recoverable fault without manual intervention.