Inverter Braking Resistor Calculation

Leave the watts entry blank or enter a value if you prefer to reduce the options.

Inverter braking resistor calculation.

Man on bike 60kg man 20kg bike 15mph or 7m s. Minimum resistance ohms. Kinetic energy m v2 2 e g. Peak braking power 0 w.

Calculating braking resistor value r v dc switch on p peak ppeak motor power rating x maximum torque x efficiency motor power rating. The calculator will list the best combinations of resistors and connection arrangements. Please note braking power is conservatively stated slightly overstated motor and drive efficiency is considered 100. Average braking power 0 w.

Use drive power rating if unknown maximium torque typically 100 to 200 use 1 5 if unknown motor efficiency typically 0 8 to 0 98 use 0 95 if unknown. Brake time or duty cycle and the total cycle time. They will reduce the braking power proportionally and hence increase the stop times for any given load. The minimum ohms are set by the drive manufacturer and will produce braking power at the peak rating of the drive or its braking module.

To calculate the right size of the resistor you need the characteristic data of the load cycle. Due to production tolerance and temperature coefficient the recommended resistance value is significantly higher than the minimum resistance value. Furthermore you need the brake power pbr and the minimum resistance value rmin which is defined by the vfd. Enter the minimum brake resistor ohms required by the inverter.

Average braking power 0 w. Brake resistor calculator instructions for use. How do you calculate the stopping energy put into a dynamic braking resistor. Ohms dc bus volts 2 peak power higher ohmic values can be used.