Choosing the right inverter braking resistor is necessary to ensure the braking effect and avoid equipment damage:
Firstly, the braking power should be calculated and the correct braking curve should be drawn; then the braking cycle and braking power should be determined according to the braking curve; according to the determined braking power and braking cycle, the reference voltage, resistance and other conditions should be selected appropriately. Braking resistor; the selected braking resistor should not be lower than the value specified in the selection manual, otherwise the inverter will be damaged directly! This should be stated when selecting the resistor.
Sometimes the braking power is not well determined, or to ensure safety, you can choose a resistor with a large braking power; the MM4 series braking resistors provided by Siemens standard transmission products are 5% braking cycle resistors, so when selecting It should be noted that the braking cycle is selected in parameter P1237; P1240 should also be set to 0 to disable the DC voltage controller.
The calculation of the braking cycle is sometimes confusing. In fact, a 5% braking cycle means that the braking resistor can consume 100% of the power in 12 seconds and then need to cool for 228 seconds. Of course, if the braking time is less than 12 seconds, or the power consumed is less than 100%, the inverter will calculate the i2t of the braking resistor. If the braking period is greater than 5%, the 440 allows a higher braking period to be set, but it is actually difficult to accurately calculate the braking situation. For example, a frequency converter brakes for 5 seconds per minute and brake power is 50%. In this case, it is generally recommended to select a resistor that is slightly larger than the theoretical calculation, and set a higher braking period accordingly in parameter P1237.
An example is given below for reference:
Assume that a 7.5 kW inverter requires 5 brakes per minute for 2 seconds and a braking power of 50%. Braking 5 times per minute, 2 seconds each time is equivalent to braking for 40 seconds in 240 seconds, and 50% of the braking power is converted to 20 seconds in time. Therefore, the braking cycle can be calculated as follows: 20/240ï‚»8%, so the braking power after the conversion is 625w, so the braking resistor of 750w is selected, and the braking cycle is set to 10% in P1237.
2*5*50%/60=7.5/Brake resistor power and then choose the big one
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