Energy management

Brake resistor

During the braking process of the 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 in order 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 done by applying the DC link voltage to brake resistors in order to convert excess energy into heat and thus to safely limit the DC link voltage. An integrated brake resistor is installed in our power supply modules as an option. If this is insufficient, AX2090-BWxx external brake 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 brake resistor.

Brake resistor for control cabinet installation

• AX2090-BW50-xxxx for AX5000
• AX2090-BW80-xxxx for AX8000

Brake resistor in IP65

• AX2090-BW65-xxxx for all systems