Product Description:

The 21.H6.ACU-11B0 is a drive module produced by KEB for the H6 Combivert Multi-Axis Drives series. It is installed in electrical cabinets where multiple servo or induction motor axes must operate in coordination. The module connects to higher-level PLCs through an EtherCAT system bus and follows the CiA 402 application profile for motion-control state management. Within an automated production line, the unit supplies controlled three-phase power to connected motors, supporting accurate speed and torque regulation. Its multi-axis architecture also allows several drive modules to exchange power through a shared DC bus, reducing the number of separate supply connections required in the cabinet.

The power section is designed for a nominal mains voltage of 400 V. It draws a continuous current of 90 A under rated load and permits a maximum current of 162 A during dynamic events such as rapid acceleration. Current monitoring trips at 194 A to protect the power semiconductors from excessive electrical stress. The overtemperature threshold is 80 °C, and thermal derating begins when the heat sink approaches this limit. A fixed carrier frequency of 4 kHz sets the pulse-width modulation switching rate and affects motor noise, switching losses, and waveform quality. Cabinet airflow must remove the 89 W of internal power loss generated by the control electronics. The enclosure has an IP20 protection rating, so the module must be installed inside a closed electrical cabinet that prevents direct contact and limits the entry of solid objects.

The module has a width of 200 mm, allowing multiple axis modules to be arranged in the same cabinet without using excessive horizontal space. Under rated operating conditions, the inverter delivers 45 kW of active power to support demanding motor loads. It presents an apparent power of 62 kVA to the supply, which must be considered when selecting upstream feeders, protective devices, and transformers. Power dissipation at full continuous output reaches 641 W through the heat sink. Cabinet ventilation must remove this thermal load while maintaining the permitted internal air temperature and adequate clearance around the cooling surfaces. The compact footprint and shared bus arrangement support closely spaced installation, but unobstructed airflow remains necessary around each module.