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How To Choose The Right VFD For Motor

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Generally, constant torque applications usually need super-heavy or heavy-duty VFDs (such as conveyor, lifting equipment, compressor and crusher). For v ariable torque applications (such as fans and pumps), ordinary frequency converters are enough.

 

The current overload rating of super -heavy load inverter is usually 150% for 2 minutes, and it can run continuously at 115% current . C urrent overload rating of heavy load inverter is 150% for 60s, and it can run continuously at 1 00 % current . Ordinary load inverters are robust to fans and pumps, 120% of rated output current for 60s, and it can run continuously at 1 00 % current . ERSAN VFDs can fully meet various load requirements.

 

After the inverter is matched with the motor, you have to ensure that the full load rated current value of the motor must be less than or equal to the full load rated current value of the inverter. The inverter is a rated current equipment, and the specifications should be based on the full load current and rated voltage, not just based on horsepower. Don’ t use motor usage factor when selecting equipment according to the full load current of the drive on the motor nameplate.

 

In current market, each VFD will be showed both heavy load and normal load ratings.

 

Such as one frequency drive show: rated power is 15KW, heavy load, overload is 150%; rated load is 18.5KW, normal load, overload is 120%. It has two full load current ratings.

 

For example: The nameplate of V76-T3-15G/18R5P is showed “15G / 18R5G” and “32A / 38A” .

 

Through Ac drives programming, users can select normal load mode or heavy load mode, and select current and overload ratings.

 

 

Constant torque applications include conveyors, compressors and cranes .

Variable torque applications include pumps and fans .