Nowadays, there are many brands in the market for variable frequency power supply products, but there are actually very few manufacturers. Some are just under the banner of manufacturers, but they are not real manufacturers. We can identify it through our business license, and we can also go to the factory to see if it is the real manufacturer. It would be better to personally go outside the factory to see if it really has production capacity, so that we can rest assured.
1、 You should choose based on your own load environment, especially rational, capacitive, and resistive loads. It's not just about choosing the maximum power of the load, as there is a starting strike current. Based on the characteristics and examples of the load, it is appropriate to choose the capacity and equipment layout of the variable frequency power supply.
(1) Fans and water pumps are relatively common loads: the request for frequency converters is relatively simple, and only the capacity of the frequency converter is needed, which is the capacity of the motor.
(2) Crane type load: The characteristic of this type of load is that it has a significant impact during startup, which requires the frequency converter to have a certain margin. At the same time, when placing heavy objects under the elbow, there will be energy feedback, which requires the application of braking units or the adoption of a shared busbar method.
(3) Uneven load: Some loads may be light or heavy, and the capacity of the frequency converter should be selected according to the environment of the heavy load, such as steel rolling machine machinery, crushing and destruction machinery, mixer, etc.
(4) Large inertia loads: such as centrifuges, punches, and rotary kilns in cement plants. These types of loads have a large inertia and can oscillate during startup, while there is energy feedback when the motor accelerates.. A slightly larger capacity frequency converter should be used to accelerate the start and avoid oscillation. The common braking unit cancels the feedback energy.
2、 According to the device environment, the protection layout of the variable frequency power supply should be adapted to its device environment. This requires consideration of environmental temperature, humidity, dust, acidity, alkalinity, corrosive gases, and other factors. This is seriously related to whether the variable frequency power supply can operate for a long time, safely, and reliably. Variable frequency power supplies should be avoided from being placed in direct sunlight, rain, or damp places. Please keep away from sources of fire and low temperatures when placing variable frequency power supplies to prevent excessive mechanical temperature transfer. The necessity of frequency conversion power supply is to stop regular maintenance, so as to extend the service life of frequency conversion power supply. If you don't take good care of a good equipment, even the best product will turn into scrap iron, which will lose its weight.
