Single-Phase Variable Frequency Drive ZEST 0.75kW 3.8A

ZEST ZQ280AS0D7 single-phase variable frequency drive is a frequency inverter rated at 0.75kW with an output current of 3.8A, designed for smooth speed control of 230V three-phase motors. Its single-phase power supply allows a suitably configured three-phase drive system to be used in workshops and facilities without a 400V three-phase supply. SVC vector control, torque regulation and automation functions allow motor operation to be adapted to process requirements.

Key Advantages of the ZEST ZQ280AS0D7 Variable Frequency Drive

• 230V single-phase power supply – enables control of a 230V three-phase motor without access to a 400V three-phase mains supply.
• SVC vector control – provides improved motor control during changes in speed and load.
• Torque Boost and slip compensation – support torque generation at low frequencies and help reduce speed loss under load.
• Adjustable ACC/DEC ramps – provide smooth starting and controlled deceleration, reducing sudden mechanical loads.
• FWD/REV and JOG – enable reversal of the direction of rotation and momentary drive operation during setup.
• Multi-speed and Simple PLC – allow the use of preset speeds and the execution of simple operating sequences.
• PID controller – automatically adjusts speed based on a signal from a suitable sensor.
• RS485/Modbus RTU – enables integration with compatible controllers and industrial automation systems.

230V Variable Frequency Drive for Three-Phase Motors

ZEST ZQ280AS0D7 allows a suitably selected 230V three-phase motor to be controlled using a single-phase electrical supply. This is a useful solution for workshops and workstations where a 400V three-phase power supply is unavailable.

The variable frequency drive regulates output frequency and voltage, allowing smooth adjustment of motor speed without the need to change mechanical gear ratios.

SVC Vector Control and Torque Regulation

The inverter supports scalar V/F control and SVC vector control, allowing the drive's operating characteristics to be adapted to changing loads. Vector control helps regulate motor torque, particularly when operating at lower speeds.

The Torque Boost function supports torque generation at low frequencies, while slip compensation helps reduce the drop in rotational speed as mechanical resistance increases. These functions are useful for machine tool drives, conveyors and feed mechanisms.

Controlled Starting, Direction Reversal and Braking

Adjustable ACC/DEC ramps allow the motor acceleration and deceleration times to be set. Gradual speed changes help reduce jerking and sudden loads on drive components.

The FWD/REV function allows the direction of rotation to be reversed, while JOG enables momentary drive operation at a preset speed. The inverter also offers DC Braking, which assists motor stopping by applying direct current.

The built-in braking system supports the connection of a suitably selected external braking resistor, extending the options for controlled stopping of drives with higher inertia.

Process Automation – Multi-speed, Simple PLC and PID

Multi-speed enables the use of previously programmed speeds, while Simple PLC allows simple operating sequences to be executed without manually setting each successive stage.

The built-in PID controller automatically adjusts speed based on a signal from a suitable sensor. This function can be used in pumping and ventilation systems that require process parameter regulation.

External Control and Modbus RTU Communication

Programmable digital inputs and analogue signals enable drive control using external push buttons, a potentiometer and compatible control systems.

The RS485/Modbus RTU interface enables data exchange with suitable PLC controllers, transmission of commands and reading of available motor operating information.

Applications of the ZEST ZQ280AS0D7 Variable Frequency Drive

The 230V single-phase variable frequency drive with three-phase output is suitable for appropriately matched drives used in:

• Lathes and milling machines – spindle speed regulation.
• Drilling and grinding machines – adjusting rotational speed to suit the machining operation.
• Conveyors – regulating material conveying speed.
• Pumps and fans – adjusting output by changing rotational speed.
• Mixers and feed mechanisms – speed control and execution of repeatable operating cycles.

Technical Specifications

ZEST ZQ280AS0D7 – Motor Speed Control and Drive Automation

The ZEST ZQ280AS0D7 variable frequency drive combines a 230V single-phase power supply with SVC vector control, torque regulation and automation functions. The frequency inverter enables controlled operation of three-phase motors in workshop and industrial applications.