DC-bus operation Introduction Terminology and abbreviations used 7 7.1 7.1.1 7.1 Introduction 7.1.1 Terminology and abbreviations used DC bus: The energy store in the controller or supply module from which the controller modulates the AC voltage for the motor. The DC buses of several controllers can be networked. DC bus: ElectricalconnectionoftheDCconnectionsofseveralcontrollersviacableor busbar. DC-voltage level: DC-voltage level in the DC bus DC-supply module: Module with AC mains connection used to supply the DC bus of a drive system with DC voltage. Regenerative power supply module: DC-supply module with additional power regeneration into the AC mains.
Multi-axis controllers (Multi Drive): Controllers for connection to a DC bus. Multi-axis controllers have no AC mains connection and no brake chopper. Single-axis controllers (Single Drive): ControllersforconnectiontoanACmainsoraDCbus.Single-axiscontrollers have an integrated brake chopper. Brake chopper: Switching element in the controller used to dissipate excess energy via a brake resistor. Brake resistor: High-performance resistor used to convert excess energy in the DC-bus into heat. Braking operation: Motoroperationingeneratormodewithenergyfeedbackfromthemotorto the controller. Mains chokes:
Inductances for damping conducted harmonic interferences which may arise from reloading the DC bus and the switching frequency of the inverter. RFI filters: RFI filters are capacitive accessories for compliance with the requirements acc. to EN 61800-3 for conducted interference emission. RFI filters can be directlyconnectedupstreamofthepowersupplymodules.RFIfiltersarealso called EMC filters. Mains filters: Mains filters reduce the conducted interference emission into the mains for compliance with the requirements acc. to EN 61800-3. Mains filters are a combination of mains choke and RFI filter in one housing. 7.1-1 EDS94SPP101 EN 3.1-04/2007