Braking Resistor Calculations

If you have all the mechanical variables of your system and have a deceleration application you should use the energy method. Braking resistor calculator you can use the following two calculators to help size your brake resistor.

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Calculating braking resistor power simple version p motor power x max torque x duty cycle motor power rating.

Braking resistor calculations. This will ensure that the minimum power rating of the resistor will always be sufficient. Typical braking applications are intermittent d 1. Use drive power rating if unknown maximum torque typically 100 to 200 use 15 if unknown for a 22kw drive with 40 duty cycle and unknowns p 2200 x 15 x 04 1320 w.

2 for braking times below 120 seconds take the average power to be dissipated in the busiest 120 seconds. To calculate the right size of the resistor you need the characteristic data of the load cycle. The braking resistor is switched on by a separate control unit activated by a sensor which is monitoring the voltage level of the dc bus and switching on the braking resistor when this voltage rises above some preset trigger level as a result of the reverse power flowing into the drive.

Brake time or duty cycle and the total cycle time. 3 do not exceed 10 x the resistor. The larger caged resistors 1 for brake times of 120 seconds and over continuously rate the resistors at the power returning from the load see note b.

A braking resistor will compensate this energy and convert it to thermal energy. The duration of the braking period determines the temperature rise of the resistor as determined by the thermal time constant of the resistor manufacturer specified.

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