Technical description

When braking a motor load, kinetic energy is converted and routed as electrical energy via the DC bus into the DC link capacitor. Depending on the drive system, the capacitors installed directly in the drive or in the power supply module store this energy to make it available to the system for new acceleration processes. The increasing DC link voltage must be limited if the capacitance of the capacitors in the system is not sufficient. This is achieved by applying the DC link voltage to braking resistors, converting excess energy into heat and safely limiting the voltage in the process.

An integrated braking resistor is installed in our power supply modules as an option. If this is insufficient, AX2090-BW65 external braking resistors can be connected to the system. With the help of the Motion Designer, the braking power for a system – consisting of several drives – can be calculated and it is possible to determine whether the internal built-in capacitance and the braking power is sufficient for the application. If necessary, the Motion Designer proposes a suitable braking resistor.

The AX2090-BW65 series braking resistors have an IP65 protection rating.