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Figure 16: Current behaviour in the uncontrolled phase
Conventional method:
Symmetrical control with high DC components
New process from Eaton (Moeller):
Asymmetrical control without DC components
￫
With single-phase connected three-phase motors with
capacitors (Steinmetz circuit), system conditions always cause
an elliptical rotating field which cannot be completely
compensated by the asymmetrical trigger control.
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
1 Device series DS7
1.14 Function
31
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