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Frequency converters 350.0 kW

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350 kW Variable Frequency Drives (VFD)

A 350 kW variable frequency drive (VFD) is a high-power electronic device for controlling the speed and torque of AC induction motors in demanding industrial environments. Drives of this power class deliver smooth acceleration, precise speed regulation, and significant energy savings under continuous duty. Full catalog: Variable Frequency Drives (VFD).

Industrial Applications for 350 kW VFDs

350 kW drives are used across the following industries:

  • Pumping stations and water supply — main line pumps, pressure booster stations, and mine dewatering systems requiring smooth starting and variable flow control.
  • Ventilation and compressors — mine main ventilation fans, centrifugal compressors. Variable speed control reduces energy consumption by 30–50%.
  • Cranes and hoisting equipment — bridge cranes, gantry cranes, port cranes, mine hoists, and heavy conveyors. These applications require vector control and a braking module to hold the load at standstill.
  • Metallurgy and heavy machinery — rolling mills, crushers, ball mills, and mixers.
  • Oil, gas, and chemical industry — process pumps, gas compressors, and petrochemical plant drives.

350 kW VFD Models

Three models rated 350 kW (G-duty) / 400 kW (P-duty) are available in stock, all with 3×380 V input:

Model Brand / Series Rated Current (G/P), A Max Freq., Hz Vector Control Application
AC70-T3-355G/400P Veichi AC70 670 / 750 400 Yes Pumps, fans, general-purpose drives
AC310-T3-355G/400P-L Veichi AC310 670 / 750 600 Yes Heavy-duty drives, hoisting equipment, compressors
GD200A-350G/400P-4 INVT GD200A 650 400 — Pumps, fans, general industrial loads

All three models are designed for 3×380 V three-phase supply with IP20 enclosure rating. P-mode allows connection of motors up to 400 kW under light-duty conditions (120% overload).

Other Power Ratings

If 350 kW does not match your requirements, browse adjacent power ratings: 315 kW (6 models), 280 kW (5 models), 250 kW (7 models), 400 kW (2 models).

Warranty and Support

All 350 kW VFDs come with the manufacturer's official warranty. Delivery throughout Ukraine via Nova Poshta, Ukrposhta, or road freight. Contact our engineers for technical consultation, motor compatibility check, and delivery terms — free of charge.

Frequently Asked Questions

What is a variable frequency drive and how does it work?

A VFD is an electronic device that converts AC mains voltage to DC (rectifier stage), then back to AC with adjustable frequency and amplitude (inverter stage). By varying the output frequency from 0 to 600 Hz, it smoothly controls the rotational speed of an AC induction motor from standstill to rated speed and beyond, while limiting starting current to 1.5× rated.

How do I size a VFD for my motor?

The VFD power rating should equal or exceed the motor nameplate power. For pumps and fans (variable torque), select based on the motor rating. For conveyors, cranes, and crushers (constant torque or heavy starting), choose one power step above — for example, for a 4 kW conveyor motor, we recommend a 5.5 kW VFD. Also verify that the motor's rated current does not exceed the VFD's current rating.

Can I run a three-phase 380V motor from a single-phase 220V supply?

Yes, you need a VFD with single-phase 220V input and three-phase 380V output, such as the Veichi AC70E or AC10 T/S2 variant. Power is limited to 2.2–4 kW depending on the series. The VFD not only starts the motor but also provides soft starting, speed control, and overload protection.

What is the difference between scalar and vector control?

Scalar control (V/f) maintains a constant voltage-to-frequency ratio — a simple, reliable method for pumps, fans, and compressors. Vector control (SVC, FOC) calculates motor current and flux vectors in real time, delivering 150–200% rated torque at low frequencies. Vector control is essential for conveyors, elevators, extruders, cranes, and CNC machine tools.

Why do I need an EMC filter in a VFD?

An EMC (electromagnetic compatibility) filter reduces high-frequency interference that the VFD generates in the power supply and airwaves. It is mandatory for facilities with sensitive equipment (medical, laboratories, server rooms), residential buildings, and when the cable between VFD and motor exceeds 25 m. The Veichi AC10, Delta VFD-E, and INVT GD20 models include a built-in Class C3 EMC filter.

How much energy does a VFD save?

On pumps and fans, savings range from 20% to 60% depending on the load profile. Power is proportional to the cube of speed (P∝n³): reducing speed by 20% halves energy consumption. If equipment typically operates at 70–80% of rated speed, average savings are approximately 40%. Payback period for a VFD on a pumping station is 6 to 18 months.