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First of all, we should know that the inverter is not normally used in any situation, so it is necessary for users to know more about the load, the environment requirements and the frequency converter. It is divided into seven areas of attention:
1 、 long term low speed rotating, because the motor calorific value is higher, the fan cooling ability reduces, therefore must use to increase the reduction ratio the way, or uses the 6 stage electrical machinery, causes the electric machinery to run in the higher frequency nearby.
2, the installation site must conform to the standards of inverter environmental requirements, otherwise easily lead to failure or shorten the service life; between inverter and motor driving distance is generally not more than 50 meters, if the longer distance is required to reduce the carrier frequency or increase the output options to the normal operation of reactor.
3, load type and frequency converter selection: the motor drive load is not the same, the frequency converter requirements are not the same.
4, fan and pump load is the most common: on the inverter for the most simple, as long as the inverter capacity is equal to the capacity of the motor can be (air compressor, deep water pump, mud pump, the rapid change of the need to increase the capacity of the music fountain).
5 crane class load: this kind of load is characterized by a great impact at startup, so the inverter has a certain margin. At the same time, the elbow will be energy feedback, so you should use the brake unit or share the bus.
6, uneven load: some of the load is sometimes light, sometimes heavy, at this time should be in accordance with the heavy load to select frequency converter capacity, such as steel rolling machinery, grinding machine, mixer and so on.
7, large inertia load: such as centrifuges, presses, cement plant rotary kiln, such load is very large, so it may start oscillation, motor slowdown when there is energy feedback. A slightly larger frequency converter should be used to speed up starting and avoid oscillation. Eliminate the feedback energy with the brake unit.
