When buyers request a VFD quotation, many only provide one detail, the motor power. "I need a VFD for a 250 kW motor." But motor power is not enough to recommend the right Variable Frequency Drive.
Selection of a suitable VFD depends on motor data, load type, site environment and control requirements. If information is missing, the quotation may be incorrect and the chosen drive may not be the one that will actually be used in practice.
1. Motor Nameplate Information
The first thing to do is check the motor nameplate. Buyers should specify motor power, rated voltage, rated current, frequency and speed.
Of these details, the rated current is particularly important. Two motors of the same power can have different current ratings. When selecting a VFD by kW or HP alone, wrong sizing, overheating or trips can happen.
If you can, please send a clear photo of the motor nameplate. This helps engineers to verify the suitability of VFD capacity faster and reduce selection error.
2. Load Type and Application
The VFD should be selected based on the machine it is controlling. Different drive configurations may be needed for a pump, fan, compressor, conveyor, crusher and mixer.
Pumps and fans are usually focused on speed control, flow adjustment and energy saving. Conveyors, crushers and compressors may need more torque and overload capacity.
Before asking for a quote, tell the supplier what equipment the motor will drive and how the machine operates. This assists in determining whether a standard VFD, heavy duty VFD, bypass cabinet, braking unit or other accessory is required.
3. Site Conditions
A VFD in a real industrial environment. Drive performance may be affected by temperature, humidity, dust, altitude, ventilation and stability of the power supply.
Protection of cabinet and cooling design are important for mining, cement, metallurgy, petrochemical plants and water treatment projects such as. Some projects may require input reactors, output reactors, harmonic filters or special enclosure design.
Providing site information helps prevent future problems like overheating, nuisance trips, unstable operation and a shortened component lifetime.
4. Control and Project Requirements
Buyers should also explain the control requirements before purchasing a VFD For example, does the system require constant pressure control, remote control, PLC communication, speed feedback, bypass operation, or multiple motor control?
It is also good to give the project country, standards needed, installation location and expected delivery time.
To get a faster and more accurate quote on VFDs please have the following information ready:
Motor power, voltage, rated current, load type, application industry, working hours, starting frequency, site environment, control requirement.
If you are not sure what VFD is right for your project send us your motor nameplate and application information. Our engineers can help to check the correct configuration and recommend a suitable VFD solution.
