Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 306)

306 Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Appendix C Application Notes
Field Current Regulator Tuning Examples
Figure 84 - Increase in the field current with oscillation
Non-optimal response of the regulator.
Top: Par 500 [Flux Ref Pct]
Bottom: Par 234 [Fld Current Pct]
Figure 85 - 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 [Flux Ref Pct]
Bottom: Par 234 [Fld Current Pct]
Figure 86 - 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 [Flux Ref Pct]
Bottom: Par 234 [Fld Current Pct]