Device for measuring the electrically isolated from the converter of a three-phase current asynchronous motor - - current picked up with a tool bit by conscious

摘要

The measurement value determination lies at the intermediate circuit potential. The potential separation is carried out across a voltage frequency converter in conjunction with a light conductor transmission. The digitally processed measurement signal allows synchronisation with external controls. The current is measured directly across a shunt instead of the known current transformer. ADVANTAGE - Voltage fluctuations in intermediate circuit have no influence on current value determination and high protection against interference is achived. Signal transmission is also free of electromagnetic and HF interferences.