Calculate your braking resistor
Use the braking resistor calculator to determine the proper braking resistor for your variable frequency drive.
Sizing your braking resistor - how it works
In a nutshell:
- Enter parameters
- Calculate required continous power
- Find the right Product
Explained in detail:
During regenerative braking, the electric motor feeds the braking energy into the DC link of the frequency converter, causing the DC link voltage to rise. A braking resistor absorbs this energy and converts it into heat: some of it immediately, the rest after the braking process is complete and the resistor has cooled down.
The characteristic data of the load cycle (duty cycle/braking time and cycle duration) are therefore important for the design of the braking resistor.
In addition, you need the braking power PBr, i.e., how quickly the energy is dissipated, and the minimum resistance value Rmin, which is specified by the frequency converter.
Due to manufacturing tolerances and temperature coefficients, the resistance value we recommend is significantly higher than the minimum resistance value. A safety margin of approx. 20% is calculated here (R = 1,2 x Rmin). This prevents possible damage to the converter components due to excessive currents.
Note for the calculator
This calculation is an approximation for the right sizing of the braking resistor.
For a detailled sizing please contact the FRIZLEN sales team under or +49-(0)7144-8100-0 or under sales(at)frizlen.com.