When the rate reference of a frequency converter is minimized, the electric motor that is managed by the converter functions as a generator and also brakes. When an electric motor serves as a generator, it supplies power back to the regularity converter. This energy is collected in the intermediate circuit of the converter.
The feature of a brake resistor is to give a lots on the intermediate circuit throughout braking, therefore making sure that the stopping power– the energy from the motor– is soaked up by the brake resistor. If a brake resistor was not used, the intermediate circuit voltage of the regularity converter would certainly proceed to increase, till it suitable defense. The benefit of using a brake resistor is it makes it possible for braking of a heavy load– as an example a conveyor belt– swiftly.
Braking resistors can develop an essential component of the frequency converter or they can be put outside the regularity converter, in which case the regularity converter needs to come with terminals that allow you to connect a brake resistor. Built-in options might conserve you some room, however putting the brake resistor outside the converter also provides a number of important benefits:
The dimension and sort of the brake resistor can be selected as required, depending upon as an example the braking cycle
The brake resistor can be placed outside the panel or cupboard that holds the regularity converter, minimizing the demand for (added) cooling
The braking power can be (re-) used.
There is no getting too hot of the electronic parts in the frequency converter, also if the brake resistor is strained.
The needs for brake resistors vary in various applications. Essential information includes:.
Brake obligation cycle, resistance as well as brake resistor power ability.
Drive minimum resistance.
Always seek advice from a frequency converter expert prior to selecting a brake resistor.