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Frequency conversion speed generally have the following 3 programs can be applied:
High and high way, that is, using 10kV (6kV) voltage level inverter, directly from the power grid l0kV (6kV) power supply, motor selection of high voltage motor;
The first is high low high, high voltage power supply into low-voltage power supply. The low-voltage inverter frequency after the step-up motor selection of high-voltage motor;
High and low, that is, with a separate transformer, the l0kV (6kV) high pressure to 380V, the use of low-voltage inverter, low-voltage motor.