96 Rockwell Automation Publication 750-RM100A-EN-P - August 2019
Chapter 10 Droop Control for Parallel Operation of PowerFlex 755TM AFE Bus Supplies
Figure 39 - Shared Bus Supply
In this simple example, we want AFE bus supply #1 to provide roughly the same
amount of current and power to the shared bus as AFE bus supply #2. One
cannot be certain the impedance from the mains to the shared DC bus is the
same between AFE bus supply #1 and AFE bus supply #2. Any impedance
mismatch can lead to a mismatch in current and power delivery. If the path
through AFE bus supply #1 has a lower impedance, then AFE bus supply #1
delivers more power than AFE bus supply #2. Differences in loading can produce
issues with component wear and reliability, which can result in unplanned
downtime.
AFE Bus Supply
#1
AFE Bus Supply
#2
AC Mains
Shared DC Bus
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