48 Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022
Chapter 4 Non-regenerative Bus Supply Configuration
10. Verify that the DC bus cable/bus bars are adequately sized for the total rated DC bus current.
The total rated DC bus current is calculated by dividing the total rated AC output current from step 8 by 0.9. In this example, 2354.0 A RMS /
0.9 = 2616 A DC.
The standard PowerFlex 755TM DC bus bar is capable of 3000 A DC. All DC bus bars in the common DC bus lineup must have the same amp
rating. See PowerFlex 755TM System DC Bus Ratings on page 99
for more information about the DC bus bar ratings and options.
The chosen PowerFlex 755TM non-regenerative supply, composed of two dual-density (2X) modules, meets the required heavy duty (HD)
continuous DC amps required for this example. Additional non-regenerative supply DC bus capacitor banks are required to the meet the
target 40 µF/A ratio requirements for this example.
Section Name Drive Product Cat. No.
DC Bus
Capacitance
(µF)
(1)
(1) See Appendix A for internal and maximum capacitance values.
Notes
Drive 1 PF755TM 20G…D1K6 45000 frame 10, HD
Drive 2 PF755 20G…D096 4500 frame 5, HD
Drive 3 PF755TM 20G…D960 18000 frame 9, HD
Drive 4 PF755 20G…D022 1020 frame 2, HD
Drive 5 Kinetix 5700
2198-S086
2198-CAPMOD-DCBUS-IO
560
2240
drive capacitor module
Bus Supply PF755TM non-regen 20JEH…D1K3
20JEH…D1K3
30000 quantity of 2 2X modules
quantity of 1 2X cap bank
Max DC Bus Capacitance 301400 0.2 sec precharge ramp time
Additional Capacitance 0 µF
Total External Capacitance
(2)
(2) The calculated total external DC bus capacitance does not include the PowerFlex 755TM bus supply internal bus capacitance.
71320 µF
Total DC Bus Capacitance 101320 µF
Precharge OK
IMPORTANT The PowerFlex 755TM non-regenerative bus supply does not contain
overload protective devices. Ensure that you provide AC overload
protective devices that will protect the non-regenerative supply and
associated AC and DC conductors and bus bars.
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