Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022 89
Appendix A Electrical Ratings, Recommended Protective Devices, and DC Bus Capacitance
Example One DC Bus Capacitance Calculation
Machine Characteristics
Attribute Value
System Voltage 480V AC
Duty Rating Normal Duty (ND)
Inverter/Drive Products PowerFlex 755TM
Drive and System Data
Drive # Product Family Cat. No.
Frame
Size
AC Output
Amps RMS
(1)
(1) Data obtained from Appendix A.
Internal DC Bus
Capacitance (µF)
(1)
1 PowerFlex 755TM 20G1D3D302 8 302 9000
2 PowerFlex 755TM 20G1D3D430 8 430 9000
3 PowerFlex 755TM 20G1D3D545 8 545 15000
4 PowerFlex 755TM 20G1D3D710 8 710 15000
5 PowerFlex 755TM 20G1F3D960 9 960 18000
Totals 2947 66000
Bus Supply PowerFlex 755TM Regenerative Bus Supply 20JxF...D3K4 12 – 75000
External Capacitance 0
Total 141000
Additional Capacitance Calculations
Target µF/A Ratio 40 µF/A 400/480V AC
Calculated µF/A Ratio 47.8 µF/A
Additional Capacitance Required 0 µF Bus Capacitance OK
Sample Bill of Material
Cat. No. Qty. Description
20G1D3D302LNDNNNNN-C0-C12-P46 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD - 300
HP (361 A), ND - 250 HP (302 A), HD - 200 HP (248 A), 480V AC, 3 PH, Frame 8, Standard EMI Protection, Door Mounted HIM (20-750-
C6S) & TotalFORCE Control
20G1D3D430MNDNNNNN-C0-C11-P46 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD - 400
HP (485 A), ND - 350 HP (430 A), HD - 300 HP (361 A), 480V AC, 3 PH, Frame 8, Standard EMI Protection & Reflected Wave (dV/dT)
Filtering, Door Mounted HIM (20-750-C6S) & TotalFORCE Control
20G1D3D545LNANNNNN-P46 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD - 500
HP (617 A), ND - 450 HP (545 A), HD - 350 HP (454 A), 480V AC, 3 PH, Frame 8, Standard EMI Protection, No HIM & TotalFORCE Control
20G1D3D710MNANNNNN-P46 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD - 650
HP (765 A), ND - 600 HP (710 A), HD - 450 HP (545 A), 480V AC, 3 PH, Frame 8, Standard EMI Protection & Reflected Wave (dV/dT)
Filtering, No HIM & TotalFORCE Control
20G1D3D960LNDNNNNN-C12-P46 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD - 900
HP (1045 A), ND - 800 HP (960 A), HD - 700 HP (800 A), 480V AC, 3 PH, Frame 9, Standard EMI Protection, Door Mounted HIM (20-750-
C6S) & TotalFORCE Control
20J1F3D3K4LNDNNNNN 1
PowerFlex 755T Bus Supplies, Air Cooled, Regenerative & Low Harmonic Bus Supply (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD
- 2632 HP (3784 A), ND - 2436 HP (3501 A), HD - 2132 HP (3065 A), 480V AC, 3 PH, Frame 12, Standard EMI Protection, Door Mounted
HIM (20-750-C6S) & TotalFORCE Control
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