Abstract
After more than 20 years of operation and numerous modifications, a substantial modernisation of the inboard pellet injection system on ASDEX Upgrade was carried out. This enhancement was necessary to meet new functional requirements and to benefit from technical progress as well. New requirements are the integration in discharge control system, variation of settings of pellet train parameters during one discharge, temperature control of ice extrusion and overcome process limits caused by out-dated vacuum components. The programmable logic controller system is now fully migrated to S7-300 using High Speed Boolean Processor FM352-5 to replace hard-wired logic elements and enable flexible control of process parameters. First applications on ASDEX Upgrade concerning high density operation and ELM control are presented to confirm usefulness of implemented features.
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