It is essential to make the right decision while selecting the variable frequency drive. Ensure to consider the current selection and voltage together with the name since it is called an adjustable speed drive, variable speed drive, inverter, and Micro drive. The work of VFD is to take the ac power source and ensure the conversion of it to dc power. The drive speed control portion uses the dc voltage for the creation of dc pulses using a variance frequency to drive the motor output at speed depending on the poles designed for the motor operating with 50 Hz or 60 ac supply voltage. The other thing will involve the selection of VFD size. This should be based on the current maximum motor at the peak demand and not based on motor horsepower. Stopping, constant starting and dynamic loads affect. You will, therefore, need to use the peak demand current. Learn more about the AC drive by clicking here. It is necessary to make sure the drive is handling any overload conditions you will expect during intermittent extra loading or startup. You may choose to upsize your drive to make sure the one you select can handle it. Various applications experience overload conditions that are temporary because of impact loading and starting requirements. Many drives of AC operate using 150 percent overload in 60 seconds. Therefore when the application needs an overload that is greater than that you will require to oversize the AC drive. There is an effect on cooling when it comes to the altitude of using the VFD. When there is increase in the altitude you will find the air is becoming less dense. On the other hand, the decrease in air density will decrease air cooling properties. It is necessary to oversize the drive when the altitude is higher for compensation for reducing the cooling. Click for more information about the AC drives. There is a significant heat amount generated by the AC drives. This can cause the internal enclosure temperature to exceed the drive rating temperature. You will, therefore, require cooling or ventilation. The other important thing is to have the calculations or measurements for the expected maximum ambient temperature. The other essential thing is to get the lowest carrier frequency that will be handled by your motor. It is necessary to choose the default carrier frequency since it will work better. However when you need the reduction of audible noise the power consumption, or heat dissipation you must be able to modify the drive carrier frequency. For more information, click on this link: https://en.wikipedia.org/wiki/Variable-frequency_drive.
0 Comments
Leave a Reply. |
|