90 Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022
Appendix A Electrical Ratings, Recommended Protective Devices, and DC Bus Capacitance
Example Two DC Bus Capacitance Calculation
Machine Characteristics
Attribute Value
System Voltage 600V AC
Duty Rating Normal Duty (ND)
Inverter/Drive Products Mixed; PowerFlex 750, 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 20G1D3E1K1 10 1045 23250
2 PowerFlex 755TM 20G1D3E242 8 242 4650
3PowerFlex 755 20G11NE9P03 9 1500
4 PowerFlex 755 20G14NE012 6 12 2600
5 PowerFlex 755 20G11NE022 3 22 1500
6 PowerFlex 755 20G11NE027 4 27 1800
7 PowerFlex 755 20G14NE042 6 42 2600
8 PowerFlex 755 20G14NE052 5 52 3600
Totals 1451 41500
Bus Supply PowerFlex 755TM Regenerative Bus Supply 20JxF…E1K5 10 – 23250
External Capacitance 0
Total 64750
Additional Capacitance Calculations
Target µF/A Ratio 28 µF/A 600/690V AC
Calculated µF/A Ratio 44.6 µF/A
Additional Capacitance Required 0 µF Bus Capacitance OK
Sample Bill of Material
Cat. No. Qty. Description
PN-50085 or ER-101011 1 Ground Fault Indicator Filter
Zig-zag transformer 1 Contact Rockwell Automation or a transformer manufacture for recommendations.
20J1F3E1K5LNDNNNNN-P50 1
PowerFlex 755T Bus Supplies, Air Cooled, Regenerative & Low Harmonic Bus Supply (PowerFlex 755TM), Type 1/IP21, Floor
Mount, LD - 1452 HP (1670 A), ND - 1279 HP (1471 A), HD - 1091 HP (1255 A), 600V AC, 3 PH, Frame 10, Standard EMI Protection,
Door Mounted HIM (20-750-C6S) & TotalFORCE Control
20G1D3E1K1LNDNNNNN-C12 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD -
1250 HP (1220 A), ND - 1100 HP (1045 A), HD - 1000 HP (980 A), 600V AC, 3 PH, Frame 10, Standard EMI Protection, Door Mounted
HIM (20-750-C6S) & TotalFORCE Control
20G1D3E242MNANNNNN 1
PowerFlex 755T Drives, Air Cooled, Common Bus Inverter with DC Precharge (PowerFlex 755TM), Type 1/IP21, Floor Mount, LD -
300 HP (295 A), ND - 250 HP (242 A), HD - 200 HP (192 A), 600V AC, 3 PH, Frame 8, Standard EMI Protection & Reflected Wave
(dV/dT) Filtering, No HIM & TotalFORCE Control
20G11NE9P0AA0NNNNN 1
PowerFlex 755 AC Drive, with Embedded EtherNet/IP, Air Cooled, AC Input with DC Terminals, Open Type, 9 A, 7.5 HP ND, 5 HP
HD, 600V AC, 3 PH, Frame 3, Filtered, CM Jumper Removed, DB Transistor, Blank (No HIM)
HSJ15 2 600VAC 15 A Class J HS Fuse
1321-M048 1 Common Mode Choke, 45 A, Open Style
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