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Drives for scanners - Australia

VARIABLE FREQUENCY DRIVES

Australia

Variable frequency drive (VFD: http: //www.vfds.org ) shall automatically reduce its carrier frequency to reduce the heat sink temperature if the temperature of the variable frequency drives heat sink rises above normal levels. As the variable frequency drives heat sink temperature returns to normal, the variable frequency drive shall automatically increase the carrier frequency to its set switching frequency. This assures the highest possible carrier frequency for a quiet motor with no need to de-rate the VFD. IGBT VFD installations in heavily residential areas are examples of where consideration to an EMI filter might be given to solve possible AM radio and TV interference problems. Other examples are hospitals that use CAT scanners or NMR machines off the same power source. VFD based equipment that must meet European CE conformity standards must also use an EMI/RFI filter connected to the VFD input.

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