1. Energy consumption type
This method is to connect a braking resistor in parallel in the DC circuit of the inverter, and control the on/off of a power tube by detecting the DC bus voltage. When the DC bus voltage rises to about 700V, the power tube is turned on, and the regenerative energy is passed into the resistor, which is consumed in the form of thermal energy, and then the DC voltage rises to be avoided. Since the regenerative energy is not used, it is an energy-consuming type. It is also an energy-consuming type, and it is different from DC braking in that it consumes energy on the braking resistor outside the motor, and the motor will not overheat, so it can work more frequently.
2. Parallel DC bus absorption type
It is suitable for multi-motor drive systems (such as drafting machines), in which each motor needs a frequency converter, multiple frequency converters share a grid-side converter, and all inverter parts are connected to a common DC bus. In this system, there are often one or several motors operating normally in the braking state, and the motor in the braking state is dragged by other motors to generate regenerative energy, which is then absorbed by the motor in the electric state through the parallel DC bus. In the case that it cannot be completely absorbed, it is consumed by a common braking resistor. Some of the renewable energy here is absorbed and used, but not fed back into the grid.
3. Energy feedback type
The grid-side converter of the energy regenerative type is reversible, and when there is renewable energy generated, the reversible converter will feed the regenerative energy back to the grid, so that the renewable energy can be used thoroughly. However, this method has high requirements for the stability of the power supply, and once the power failure is suddenly, it will produce inverter overthrow.
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Specifications for the use of power converters
Operating regulations for power inverters
Maintenance & Installation
Work according to the weight of the product.
The number of inverter boxes cannot be stacked in excess of the specified number.
Install according to the user manual.
Do not open the case during transport.
Do not place ...
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The five stages of mastery of PLC technology
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一、变频器工作温度较高
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