Overview
2.3 Perfect Harmony Features
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
27
● Control confirms firing from:
– Output voltage divider
– Output Hall Effect current transducer
● No two cells ever switch at the same time
● Cell switching rate is low compared to effective switching frequency of VFD:
– Typically 600 Hz carrier frequency per pole, results in 1200 Hz switching frequency
per cell
● VFD effective switching frequency is simply the cell switching frequency times the number
of cells per phase
● Switching rate is constant over the entire output frequency range
● Default control is an open flux vector control:
– V/Hz and closed loop (i.e., encoder) control modes also available
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