52 Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022
Chapter 5 Paralleling Two PowerFlex 755TM Regenerative Bus Supplies
• There are practical limitations to the current carrying capacity of the system bus bars and other components. When considering paralleling
modules perform calculations for the total bus supply DC current and make sure the system requirements do not exceed the PowerFlex
755TM common DC bus system bus bar rating (standard = 3000 A DC, option -P46 = 4700 A DC). See PowerFlex 755TM System DC Bus Ratings
on page 99 for more information about PowerFlex 755TM DC bus bar ratings.
Load Sharing Two PowerFlex 755TM Regenerative Bus Supplies
• An isolation transformer is required to isolate the two PowerFlex 755TM regenerative bus supplies. The transformer kVA must be equal to or
greater than the PowerFlex 755TM regenerative bus supply's input kVA.
• The system impedance must be less than 10%.
• AC source and DC Bus configuration must be symmetrical when installing a parallel PowerFlex 755TM regenerative bus supply system.
• Parameter 13:45 [DC Bus Ref Sel] must be set to 2 'Droop Ctrl' on each of the PowerFlex 755TM regenerative bus supplies.
• Verify that the PE-B Jumpers are configured properly. For more information, see the PowerFlex 750-Series Products with TotalFORCE Control
Installation Instructions, publication 750-IN100
.
AC Power System Resonance Conditions
See AC Power System Resonance Conditions on page 20 for more information.
Kinetix 5700 Servo Drives
See Kinetix 5700 Servo Drives on page 22 for more information.
Sizing Bus Supply
See Basic Sizing of the Regenerative Bus Supply on page 23 for more information.
Dynamic Bus Control
See Dynamic Bus Control for Large Capacitor Bank Applications on page 21 for more information.
ATTENTION: It’s critical that the DC Bus configuration is symmetrical to
ensure that there are no impedance differences seen by the two
PowerFlex 755TM regenerative bus supplies.
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