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

Multiple-functional Buttons

The front-panel keypad puts all essential controls within reach in a compact, logically grouped layout. Color-coded buttons make operation unambiguous at a glance. The central rotary dial handles both speed adjustment and numeric parameter entry. A multifunction shortcut key can be reassigned to jog mode, frequency-source switching, or a custom function to suit the application — reducing operator steps without rewiring.

Clear LED Display

Positioned above the keypad for clear sightlines from normal working distance, the LED screen shows real-time operating data including output frequency, current, voltage, and motor RPM. During parameter setup, it confirms each value as it is entered; on a fault, it displays the fault code immediately and holds it for diagnosis. The last three fault events are stored in the history log and retrievable directly from the keypad — no laptop or external tool required.

Durable Housing

Precision-formed ventilation slots run the full height of both side panels, maximizing airflow across the internal heatsink and power components. The internal cooling fan draws air through the base and exhausts it from the top in a directed chimney path, keeping IGBTs and capacitors within their rated temperature range even at sustained full load. Fan speed is thermally modulated — quieter at light load, full speed when conditions demand — extending bearing life and reducing unnecessary noise.

Features

• Built-in PID Controller: The integrated PID controller accepts signals from sensors (such as pressure, temperature, or flow) and automatically adjusts the output to maintain set values. This enables the creation of a closed-loop control system without external controllers, simplifying system architecture and enhancing control precision.
• Automatic Energy-Saving Operation: The V/F curve is automatically optimized based on the actual load; output voltage is reduced during light-load conditions to minimize energy waste. This results in significant power savings during long-term operation of variable-load equipment like fans and pumps.
• High Starting Torque: It delivers 150% of rated torque at 1Hz, ensuring powerful low-frequency startup. It handles heavy-load starts without stalling or tripping, making it ideal for equipment requiring high starting torque, such as mixers, conveyors, and hoists.

Use Cases

• Water Supply & HVAC: Constant-pressure water supply, pumps, fans, cooling towers, and HVAC circulation systems; PID closed-loop control ensures stable pressure and flow.
• Industrial Processing: Air compressors, conveyor belts, mixers, food processing machinery, woodworking routers, and stone cutters; vector control ensures high torque at low speeds.
• Agriculture & Outdoor: Agricultural irrigation, sprinkler systems, car washers, rolling shutters, and barrier gates; compatible with single-phase power supply and offers flexible installation.
• Lifting & Transport: Small lifting equipment, hoists, and conveyor lines; ensures smooth startup and reduces inrush current.
• Energy-Saving Retrofits: Variable-load equipment such as fans and pumps; automatic energy-saving operation for long-term electricity cost reduction.
• Closed-Loop Control Applications: Motor speed control systems requiring PID closed-loop operation via pressure, temperature, or flow sensors.

Application Scenarios

HVAC

Industrial Printing

Conveyor Belts

Air Compressors

Q1: Can a 380V three-phase motor be used directly with a VFD that accepts a single-phase 220V input?

It depends on whether the motor supports reconfiguration. Most dual-voltage (380V/220V) motors can be switched from a star (Wye) connection to a delta connection by reconfiguring the links in the terminal box, allowing them to operate with a 220V three-phase output. If the motor nameplate specifies only 380V, it cannot be used directly; you would need to replace the motor or use a step-up transformer.

Q2: Can a single-phase to three-phase VFD drive a single-phase motor?

No. The three-phase output of a VFD is designed for three-phase asynchronous motors and cannot be connected to single-phase motors (i.e., motors with capacitors).

Q3: Can a VFD be used as a variable-frequency power supply?

No. A VFD outputs a pulsed square wave with high harmonic content; its voltage and frequency change proportionally and cannot be adjusted independently, so it does not meet the requirements of a standard AC power supply. In principle, it is intended solely for speed control of three-phase asynchronous motors and cannot serve as a general-purpose power supply.