How to choose the inverter?
Parameters for choosing the frequency Converter is quite a lot and I gradually you will talk about basic are actually in the first place should pay attention. So your frequency Converter was denied the job because of excess temperature regime should pay attention to protection class to the inverter worked for a long time and steadily you will need a reliable heatsink or forced cooling. That is interesting, but if you use together with chastotnik advanced protection type IP 54, or higher class, it is possible to get a quality heatsink just to be sometimes impossible. In this case, the inverter is placed in a separate Cabinet with an additional system protection. In the control Cabinet dialed the equipment with a lower protection class and the entire Cabinet is forcibly cooling and ventilating. To one frequency Converter can be connected in parallel several engines. What does it do It is primarily necessary to minimize the cost management system for multiple asynchronous motors. The main thing to choose the inverter itself in power, its capacity should be at least 10% more of the total capacity in the load. The ends of the supply should be in this case very small, and the presence in the circuit of the motor throttle as appropriate. In any case, if the scheme is not implemented delay line switching control of each engine passes through the zero point, i.e. the first chastotnik is disabled, then the power wires are moved to a different engine and re-enabled the inverter to work. Now I think we need to say a few words about the regulatory process. In order to obtain the maximum value from the frequency Converter to optimally need to harmoniously adjust the frequency and the output voltage at the output of chastotnik.
output Voltage of the inverter is directly connected to the load. If the torque does not change in the process, the voltage on the stator is adjustable in proportion to the frequency (in this regulation called a scalar), but there is another vector regulation. But it is worth knowing that these two types of adjustment are simple, and there are more and more complex modes of adjustment.
And finally the main advantages of the drive with frequency conversion. This drive is a completely new way will allow you to look at the process control of an induction motor, because in addition to increasing efficiency provides a lot of additional positive aspects. The thing is that when such a Converter, many unnecessary elements in the control circuit just become redundant. Do not want to have to put the throttle nor the brake system, etc Braking system is implemented by creating a counter magnetic field in the stator of the induction motor. Basically just changing the relationship between frequency and voltage, without changing the mechanical parts in the control system, we have a completely new drive solution for the engine.
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