PowerFlex Digital DC Drive User Manual -
Publication 20P-UM001C-EN-P - July 2008
C-28
Application Notes
Field Current Regulator Tuning Examples
Figure C.5 Increase in the field current with oscillation
Non-optimal response of the regulator.
Top: Par 500 [Field Ref Pct]
Bottom: Par 234 [Fld Current Pct]
Figure C.6 Too high of a time constant on the field
The reduction of the field current depends on the field time
constant. Therefore, the regulator has no influence on the flux
current.
Top: Par 500 [Field Ref Pct]
Bottom: Par 234 [Fld Current Pct]
Figure C.7 Increase in the field current without
oscillation
This graph, as compared to the graph in Figure C.5, shows an
increase in [Fld Reg Kp] from 2% to 10% with [Fld Reg Ki] = 5%.
Top: Par 500 [Field Ref Pct]
Bottom: Par 234 [Fld Current Pct]
