The control requirements for electric drive equipment require accurate positioning and precise stopping in the fastest possible time. During the stopping process, the regenerative energy generated by the inertia operation of the motor will cause the bus voltage of the frequency converter to be too high, resulting in the breakdown of the module due to the high bus voltage of the frequency converter. In order to prevent the breakdown of the module due to the high bus voltage of the frequency converter, it is necessary to configure discharge resistors (also known as regenerative resistors) on the bus of the frequency converter
Install discharge resistors for frequency converters in the following equipment scenarios
1. Elevator
2. Servo drive for X, Y, and Z axes of mechatronics equipment
3. Some precision controlled equipment
The discharge resistor is configured for the frequency converter in the following device drive scenarios
The operation of some devices does not require the location and timing of braking, and does not require the configuration of discharge resistors (regenerative resistors)
1. Fan
2. Water pump
3. High speed trains
After the frequency converter microprocessor issues a stop command, these devices stop due to the lack of time and position requirements for stopping the equipment. The motor stops by inertia, and the regenerative energy of the motor winding is exhausted by the motor winding coil during the stopping process.
Configuration of discharge resistor, resistance value and power
Taking the configuration of the Yaskawa frequency converter series as an example:
1. Inverter power 2.2KW: Resistance configuration 300W250 ohms
2. Inverter power 3.7KW: resistor configuration 500W150
3. Inverter power 5.5KW: resistor configuration 500W100
4. Inverter power 7.5KW: resistor configuration 800W80
5. Inverter power 11KW: resistor configuration 1000W50
6. Inverter power 15KW: resistor configuration 1500W40
7. Inverter power 18.5KW: resistor configuration 4800W30
8. Inverter power 22KW: resistor configuration 4800W30
9. Inverter power 30KW: resistor configuration 5000W20
