SFC Static Frequency Converter

High-quality input waveform

Perfect output waveform

•  Multi-pulse rectification eliminates the need for additional power factor correction and harmonic suppression devices.
• Automatic pre-charge power limits transformer inrush currents.
• The total harmonic distortion (THD) of the input current remains well below the national standard limit of 5%, while maintaining the inverter input power factor close to 1, significantly improving the quality of the grid-side power supply.

Multi-Level Superposition for Voltage Sinusoidal Waveform Output

•  Produces a high-quality sinusoidal waveform without torque pulsations caused by harmonic components from frequency converters, even at low speeds.
•  Features a low dv/dt, eliminating the need for special insulation for motors and cables and avoiding motor replacement.
   

Name

Item

Specification

Input

Power Supply

3-phase 6kV/10kV, Frequency: 50/60Hz

Input voltage range

Voltage：-10%～+10%;Frequency;±2%

Output

Rated Voltage

3-phase 6kV/10kV,Frequency：50/60Hz

Frequency

modulation range

50/60Hz

Setting resolution

0.01 Hz

Overcurrent capability

120% of rated output current,1m/Every10m;

150% of rated output current for instantaneous protection

Control

Control method

V/F control with PG vector control and without PG vector control.

Synchronous switching

The frequency converter follows the voltage phase and frequency of the power grid, achieving a state of grid connection and smooth switching from frequency converter to power frequency without impact.

Torque compensation

Automatic torque boost during startup to reach above 150%.

Slip compensation

Compensates for speed drop under load to enhance mechanical robustness.

Upper and lower frequency limits

Upper and lower frequency limits can be set.

Skip frequency

Skip frequency can be set in 3 groups.

Speed tracking during restart

The inverter can automatically search for the motor speed and smoothly restart operation when

the motor is coasting due to power loss.

Acceleration and deceleration time

Acceleration and deceleration time can be independently set from 0.1 to 3600 seconds.

Control

Acceleration and

deceleration profile

types

Linear or S-curve profiles can be selected to meet various application requirements.

Operating modes

Local operation, on-site operation, remote operation.

Stopping methods

Option to choose between coasting stop or deceleration stop.

PID closed-loop

control

Can be applied to various closed-loop control systems such as flow, pressure, temperature, and

more.

Neutral drift

By bypassing a power unit and using neutral drift technology, the three-phase output stays balanced. This guarantees maximum output power even after bypassing a unit. In case of a single-unit failure, the system can operate in bypass mode without impacting regular production operations.

Automatic unit

bypass

When a unit malfunctions, the inverter can automatically bypass the faulty unit and continue operating using neutral drift technology without the need for manual intervention. If more than two units are bypassed, users simply need to operate at a reduced capacity as necessary.

Power failure

restart

In the event of an abnormal power outage, the inverter can automatically restart and restore to its pre-power loss state once the grid is restored within the set time, without the need for manual intervention.

Frequency setting

Analog input signal setting: Configurable via a 4-20mA current signal. Multiple frequency segment selection settings.

Fieldbus

Modbus,Tcp/ip,PROFIBUS-DP