Medium Voltage VFD 6kV / 10kV for 200-12,000 kW Motors – CFV9000A Series

Medium Voltage VFD 6kV / 10kV for 200-12,000 kW Motors – CFV9000A Series

The CFV9000A is a medium voltage VFD for 6 kV and 10 kV squirrel-cage asynchronous and synchronous motors from 200 kW to 12,000 kW. It combines a high-speed DSP control core, space voltage vector control and power-unit series multi-level technology, producing a multiplexed SPWM sine-wave output from 0-6 kV (or 0-10 kV). Harmonic levels are far below the IEEE 519 standard and input power factor exceeds 0.95, so no external harmonic filters, power factor correction or output filters are required. Two quadrant versions are offered: 2-quadrant F types for 200-12,000 kW and 4-quadrant T types for 200-2,000 kW with higher overload. Efficiency exceeds 98% at rated output. The drive is IP31 rated, forced air-cooled, and CE certified.

Key Features

• High-speed DSP control core with space voltage vector control
• Power-unit series multi-level topology for direct 6 kV / 10 kV output
• Harmonic levels much lower than the IEEE 519 standard – no external harmonic filter needed
• High input power factor (>0.95) and good output waveform quality – no power factor compensation or output filter required
• Efficiency > 98% at rated output
• 2-quadrant (F) and 4-quadrant (T) versions with different overload capacity
• Electromagnetic coupling with multi-channel optical-fiber transmission for high-voltage isolation
• Touch-screen HMI showing input/output voltage and current, set values, unit fault status, transformer status and unit bus voltage
• Local, remote and upper-computer control modes with 4-20 mA analog setpoint
• Complete protection: motor overcurrent, machine over/under voltage, unit overcurrent/overvoltage/overtemperature, unit input phase loss, optical-fiber communication fault
• Acceleration and deceleration time settable separately, 0.01-6000.0 s
• All-in-one (Y) cabinet with switch cabinet included, or separate cabinet type

Technical Specifications at a Glance

Model Selection: 89 Ratings from 250 kW to 5,000 kW

Each CFV9000A rating is defined by output capacity (kVA), adapted motor power and rated output current. Select by voltage class (6 kV or 10 kV), quadrant type (F or T) and the motor rated current. Separate cabinet types are shown first; the all-in-one (Y) type includes the switch cabinet. Dimensions and weight depend on the selected options.

6 kV 2-quadrant (F), separate cabinet

Model code explanation: CFV9000A-1250-10K-T = CFV9000A series (perfect harmonic-free VFD); 1250 = rated output capacity in kVA; 10K = output voltage 10 kV (6K = 6 kV); T = 4-quadrant (F = 2-quadrant); add Y for the all-in-one cabinet type. 4-pole motors are standard; 6-12 pole motors are selected by current.

6 kV 4-quadrant (T), separate cabinet

10 kV 4-quadrant (T), separate cabinet

6 kV 2-quadrant (F), all-in-one (switch cabinet included)

10 kV 2-quadrant (F), all-in-one (switch cabinet included)

Note: the manufacturer reserves the right to modify the product; size and weight change with user requirements and options. Non-standard configurations are available on request.

Space Vector Control and Multi-level Power Units

The CFV9000A uses high-speed DSP control with space voltage vector control and power-unit series multi-level technology. Multiple low-voltage power cells are connected in series to synthesize the 6 kV or 10 kV output directly, using multiplexed SPWM to produce a near-sinusoidal waveform. This is the topology that gives MV drives low dv/dt, low motor heating and clean output without external filters.

Harmonic Performance and Power Factor

The harmonic index of the CFV9000A is much lower than the IEEE 519 standard, and the input power factor exceeds 0.95 at typical operating points. As a result, no additional harmonic filters, power factor compensation devices or output filters are needed – a significant saving in project cost, footprint and maintenance compared with 12-pulse or other drive topologies.

2-Quadrant (F) vs 4-Quadrant (T) Versions

2-quadrant F types cover 200-12,000 kW and are designed for loads that run in one direction, with overload capacity of 105% continuous, 130% for 1 minute and 150% for 3 seconds. 4-quadrant T types cover 200-2,000 kW and handle regenerative loads that must run in both directions or return energy, with 150% continuous, 180% for 1 minute and 250% instantaneous protection – the right choice for hoists, downhill conveyors and test stands.

Motor Protection Package

Protection functions include motor overcurrent, whole-machine overvoltage, whole-machine undervoltage, unit overcurrent, unit overvoltage, unit overtemperature, unit input phase loss and optical-fiber communication failure. Each power unit is monitored individually, and its status is shown on the touch screen, so a developing fault in one cell is detected before it shuts down the whole drive.

HMI and Control Modes

Local control is available from the touch screen or the cabinet door switch; remote external control and upper-computer operation (optional) are also supported. Frequency setpoint can come from the touch screen digital setting, multi-speed setting, or an external analog signal (DC 4-20 mA). The touch screen displays input/output voltage, input/output current, set values, fault status of each unit, running status, transformer status and unit bus voltage. Relay outputs indicate running/stop, fault and alarm status.

High-Voltage Isolation

High-voltage isolation uses electromagnetic coupling with multi-channel optical-fiber transmission between the control board and the power units. This keeps the low-voltage control circuitry safely separated from the 6-10 kV main circuit, the same approach used in industrial MV drives, and it eliminates the insulation issues of single-point trigger designs at higher voltage levels.

Environmental and Installation Requirements

The CFV9000A is IP31 rated with forced air cooling, for indoor installation away from direct sunlight, corrosive or conductive gas, dust, water droplets and vibration. Operating temperature is -10 to +40 °C, humidity 20-90% RH non-condensing, vibration up to 5 m/s² (below 0.6 g), and altitude below 1000 m (high-altitude versions can be customized). Storage temperature -20 to +65 °C.

Applications

The CFV9000A is used for fans, water pumps, compressors and belt conveyors in general duty, and for compactors, crushers, extruders, mixers, mills and kilns in heavy-duty processes – typical in power plants, water supply, mining, cement, metallurgy and petrochemical plants where 6 kV / 10 kV motors require variable speed with high efficiency and low harmonics.

FAQ

What is the difference between a medium voltage VFD and a low voltage VFD?

A medium voltage VFD connects directly to 6 kV or 10 kV mains and drives motors above 200 kW, using series multi-level power cells instead of a single inverter stage. Low voltage VFDs such as the XFC550 vector VFD or the XFC500 pump VFD cover 380-480 V motors from 1.5 kW to 450 kW. The choice is decided by the motor voltage and power – for 6-10 kV motors, a medium voltage drive is required.

Medium voltage VFD or medium voltage soft starter?

If the MV motor runs at fixed speed and only needs smooth starting, a medium voltage soft starter such as the CMV series is the lower-cost solution. If the process needs variable speed or energy saving on fans, pumps and conveyors, the CFV9000A VFD recovers its higher first cost through electricity savings, typically within a short payback period.

Which motors can the CFV9000A drive?

Three-phase squirrel-cage asynchronous and synchronous motors rated 6 kV or 10 kV, from 200 kW to 12,000 kW (2Q) and 200-2,000 kW (4Q). 4-pole motors are standard; 6-12 pole motors are selected according to the motor current.

What is the difference between the 2-quadrant and 4-quadrant versions?

The 2-quadrant F version drives one-direction loads and provides 105% continuous / 130% 1 min / 150% 3 s overload. The 4-quadrant T version supports bidirectional and regenerative operation with 150% continuous / 180% 1 min / 250% instantaneous overload, for hoists, downhill conveyors and similar loads that return energy.

Does the drive need external harmonic filters or power factor equipment?

No. The multi-level topology keeps harmonics far below the IEEE 519 standard and the input power factor exceeds 0.95, so external harmonic filters, power factor compensation devices and output filters are not required.

What protection functions are built in?

Motor overcurrent, whole-machine overvoltage, whole-machine undervoltage, unit overcurrent, unit overvoltage, unit overtemperature, unit input phase loss and optical-fiber communication failure. Each power unit is individually monitored via the touch screen.

What are the installation and environmental requirements?

IP31 rated, forced air-cooled, indoor installation. Ambient temperature -10 to +40 °C, humidity 20-90% RH non-condensing, vibration below 0.6 g, altitude below 1000 m (high-altitude versions can be customized).

Can the CFV9000A be customized?

Yes. High-altitude versions, non-standard cabinets and option changes (bypass cabinet, connection cabinet, control options) are available on request; dimensions and weight change accordingly.

Request a Quotation

Send your motor nameplate data (power, voltage, current, motor type, application) via the contact page and we will confirm the matching CFV9000A rating, quadrant type, cabinet option and delivery time. For project references see our project page, and for company background see our about page.