Siemens 6SR41 series Product User Manual page 29

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