Introduction to the manual20Terms and abbreviationsTerm/Abbreviation DefinitionABRC Brake chopper control boardADPI Diagnostics and panel interface boardAGDR Gate driver control boardAGPS Power supply board for IGBT gate driver boards. Used in implementation ofthe optional Prevention of unexpected start-up function.AIBP Input bridge protection boardAIMA I/O module adapter.AINP Input bridge control boardAINT Main circuit boardAPOW Power supply boardASTO Safe torque off boardDDCS Distributed drives communication system; a protocol used in optical fibercommunication.DTC Direct torque controlEMC Electromagnetic compatibilityEMI Electromagnetic interferenceIGBT Insulated gate bipolar transistorIT system Type of supply network that has no (low-impedance) connection to ground/earth.NAIO Analogue I/O extension moduleNDIO Digital I/O extension moduleNRFC EMC filter boardNTAC Pulse encoder interface modulePE Protective earthPELV Protective extra low voltagePOUS Prevention of unexpected start-upRDCO Satellite board that mounts on the RMIO board to increase the number ofDDCS channels available.RDCU Drive control unitRFI Radio-frequency interferenceRMIO Supply/motor control and I/O boardRRIA Resolver adapter moduleRTAC Pulse encoder adapter moduleSTO Safe torque offTHD Total harmonic distortionTN system Type of supply network that provides a direct connection to ground (earth).