There is no need to connect the braking unit within 75KW, but directly connect the braking resistor, B/DC and B-. When the DC bus is overvoltage, the switch tube is turned on, and the electric energy is converted into heat energy through the resistor and consumed. Above 75KW, it is necessary to connect the braking unit first and then the braking resistor.
The braking unit is connected to B/DC and DC-, and the braking resistor is connected to the terminal of the braking unit. When the brake unit connected to both ends of DC bus detects overvoltage, the switch tube inside the brake unit is turned on, and the electric energy is also converted into heat energy through the resistor and consumed.
Extended data:
Precautions:
1. In the installation position, the braking resistor cannot be installed in the same control cabinet as the inverter, which is to avoid problems and failures caused by the heating of the inverter.
2. The inverter can't be put together with other equipment that is prone to fever. Of course, the braking resistance should not be too far away from the frequency converter, and it should be kept within five meters, not more than ten meters at most.
3. In the design of resistance cabinet, the heat dissipation of braking resistance must be considered and sufficient heat dissipation must be ensured. First, you need to reserve enough space.
4. It is necessary to drill the cooling holes. When the braking resistor is frequently connected, a cooling fan is required. When the resistance box and frequency conversion cabinet are more than five meters, twisted pair is needed.
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