Intelligent energy recovery for maximum efficiency
The AX8820 universal regenerative unit is used to feed regenerative energy back into the supply network. It is compatible with the AX8000 multi-axis servo system, AX5000 digital compact servo drives, and third-party devices. The energy is regenerated sinusoidally, preventing the grid distortions that are common with block-shaped regeneration. For effective energy management, the regenerative energy is initially stored in the DC link. The recovery into the supply network does not begin until shortly before the overvoltage threshold of the connected devices is reached. Multiple energy regeneration modules can be operated in parallel to ensure the regenerative power is optimally adapted to the requirements of the machine. No EtherCAT communication is required to carry out energy recovery. EtherCAT is used only for parameterization – for example, to adjust voltage levels for connected devices. Using EtherCAT extended diagnostics, it is possible to analyze the actual regenerative energy. The online data can be used to record the timing of the machine processes. This allows operators to analyze whether staggering the machine processes could improve machine efficiency.
Braking resistors
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-BWxx external braking resistors can be connected to the system. The Motion Designer can calculate the braking power for a system with multiple drives and determine whether the internal capacitance and braking power are adequate for the application. If necessary, the Motion Designer proposes a suitable braking resistor.
Braking resistors for control cabinet installation
- AX2090-BW50-xxxx for AX5000
- AX2090-BW80-xxxx for AX8000
Braking resistors in IP65
- AX2090-BW65-xxxx for all systems
