Inverter Braking Resistor Calculation

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. Due to production tolerance and temperature coefficient the recommended resistance value is significantly higher than the minimum resistance value. Stop energy remember friction drag etc all work in your favour remember first of all to convert everything into the right units.

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Peak braking power 0 w.

Inverter braking resistor calculation.

To calculate the right size of the resistor you need the characteristic data of the load cycle. 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. Furthermore you need the brake power pbr and the minimum resistance value rmin which is defined by the vfd.

Minimum resistance ohms. Leave the watts entry blank or enter a value if you prefer to reduce the options. Please note braking power is conservatively stated slightly overstated motor and drive efficiency is considered 100. Average braking power 0 w.

Metres kilograms seconds and for rotational energy radians. Enter the minimum brake resistor ohms required by the inverter. They will reduce the braking power proportionally and hence increase the stop times for any given load. Brake resistor calculator instructions for use.

Man on bike 60kg man 20kg bike 15mph or 7m s. How do you calculate the stopping energy put into a dynamic braking resistor. Kinetic energy m v2 2 e g. Max resistance 0 ohms.

Brake time or duty cycle and the total cycle time. Ohms dc bus volts 2 peak power higher ohmic values can be used. 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. Average braking power 0 w.

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