How to Determine the Inverter Capacity?

As a Variable Speed Drive Manufacturers, share with you. Reasonable capacity selection itself is an energy-saving and consumption-reducing measure. According to existing information and experience, there are three simpler methods:

1) The actual power of the motor is determined. First determine the actual power of the motor to select the capacity of the inverter.

2) Formula method. When a frequency converter is used for multiple motors, it should be satisfied: at least the influence of the starting current of one motor must be considered to avoid the frequency converter from over-current tripping.

3) Inverter based on motor rated current method.

Frequency Inveter

The process of selecting the inverter capacity is actually the best matching process between the inverter and the motor. The most common and safer is to make the capacity of the inverter greater than or equal to the rated power of the motor, but the actual matching should consider the motor’s The difference between the actual power and the rated power is usually because the selected capacity of the equipment is too large, but the actual required capacity is small. Therefore, it is reasonable to choose the inverter according to the actual power of the motor. Avoid using an excessively large inverter and increase the investment. For light loads, the inverter current should generally be selected according to 1.1N (N is the rated current of the motor), or according to the maximum motor power indicated by the manufacturer in the product that matches the output power rating of the inverter.

Main power

1) Power supply voltage and fluctuations. Special attention should be paid to adapt to the setting value of the inverter's low-voltage protection, because in actual use, the grid voltage is more likely to be low.

2) Main power frequency fluctuation and harmonic interference. This interference will increase the heat loss of the inverter system, resulting in increased noise and reduced output.

3) When the Frequency Inveter and the motor are working, their own power consumption. When designing the main power supply of the system, both power consumption factors should be taken into consideration.