A variable frequency drive controls motor speed during operation by adjusting its output frequency and voltage. A soft starter primarily manages motor starting and, depending on the model, stopping; choose a VFD when the application requires ongoing speed adjustment.

Start with the motor’s voltage, horsepower or kW, and nameplate full-load current, then confirm the available supply voltage and phase. Check the drive’s output-current and overload ratings for the application, along with installation conditions, enclosure requirements and any required derating.

ATV12 serves small-machine applications, ATV320 covers a broad range of machine requirements, and ATV340 addresses higher-performance machine needs. For HVAC, consider ATV212 or ATH230; for process applications, start with ATV600 for pumps and fans or ATV900 for demanding equipment such as conveyors and mills. Final selection depends on the specific model and operating requirements.

Selected Altivar models support single-phase input with three-phase motor output, subject to Schneider Electric’s model-specific selection and derating requirements. Check the exact catalogue number and applicable documentation: single-phase input capability does not mean the drive can operate a single-phase motor.

Identify the existing drive’s complete catalogue number and record the motor data, supply voltage, control connections and communication requirements. Confirm the proposed replacement’s ratings, dimensions, braking options and configuration requirements before ordering; a newer drive with the same horsepower may require installation or control changes.