Leader & Harvest is a professional variable frequency drive manufacturer in China, providing VFD, which is also known as AC driver and medium voltage frequency inverter. Variable frequency drive is mainly used for adjusting or changing the frequency of alternating currents applied to electrical motor. Our VFD systems are available in different voltage and current ratings ...

A variable frequency drive, which is also called VFD, is used for controlling the frequency of the electrical power supplied to AC electric motor, thus controlling the rotational speed of the motor. Variable frequency drives are also known as adjustable frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives. These drives are sometimes also called variable voltage variable frequency (VVVF) drives, for the voltage is varied along with frequency. A variable frequency drive system generally consists of an AC motor, a controller and an operator interface.

Power generation: induced draft fans, forced draft fans, condensate exhausting pump, boiler feed water pumps, primary fan, secondary fan, circulating pump, mill fan, slurry pump, mill .
Metals: dusting fans, slurry pump, feeding pump, furnace fans, compressor, mill
Cement: fan, discharge fan, waste gas fan, dust collecting fan, dust removing fan, mill.

Multi-level voltage source VFD with the technology of cascade-connected power cells can directly output medium voltage, i.e. 3kV, 3.3kV, 4.16kV, 6kV, 6.6kV, 10kV and 11kV. VFD is composed of phase-shifting transformer, power cells and controller.

At soft start status, VFD will start and accelerate to the frequency of power grid regardless of the given frequency. When the output frequency of VFD reaches the frequency of power grid (set in main interface), then the output of VFD will become 0, at the same time VFD sends ' transfer to power grid' command.

1 Rated output current is □□□A, including 3 digital bits.
2 Rated output voltage: 03－3kV; 03.3－3.3kV; 04.16－4.16kV; 06－6kV; 06.6－6.6kV; 10－10kV; 11－11kV.
3 Control mode: A- asynchronous motor; S-synchronous motor; VA-asynchronous motor vector control; VS- synchronous motor vector control; FVA-asynchronous motor

Leader & Harvest is a main variable frequency drive manufacturer in China. 10 years experience taught us how to provide superior frequency converters. Now, our company has been guaranteed by ISO9001 and ISO14001 certificates. Our products have been exported to Europe, North America, South America, Africa

Leader & Harvest is a main variable frequency drive manufacturer in China. 10 years experience taught us how to provide superior frequency converters. Now, our company has been guaranteed by ISO9001 and ISO14001 certificates. Our products have been exported to Europe, North America, South America, Africa

The factory locates in Yangfang Industry Zone, a part of Zhongguancun Science & Technology Park, with convenient transportation. There are about 300 workers and 60% employees are college degree. Company attaches importance to training, which is base of "quality assurance, dispatch in time".

Beijing Leader&Harvest Electric Technologies Co., Ltd was established in 1998. It is a high-tech enterprise with annual growth rate of more than 50%. The headquarter locates in Zhongguancun Science&Technology Park with area of 40000m2. There are 700 employees and about 500 sets of advanced producing equipments and detecting instruments ...