44 Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022
Chapter 4 Non-regenerative Bus Supply Configuration
5. Verify that the chosen PowerFlex 755TM non-regenerative bus supply is capable of precharging the total connected DC bus capacitance.
• The PowerFlex 755TM non-regenerative bus supply maximum DC bus capacitance data and precharge delay settings are taken from
Table 13 on page 72
.
The total connected DC bus capacitance is 101420 µF. Sum the PowerFlex 755TM non-regenerative module maximum DC bus capacitance
values for one 1X module and two 2X modules. With a 0.2 second precharge ramp time, the total maximum DC bus capacitance is 81700 µF
+ 150700 µF + 150700 µF = 383100 µF. This exceeds the total connected capacitance of 101420 µF; the PowerFlex 755TM non-regenerative
bus supply precharge delay time can be set to 0.2 seconds or higher.
The chosen PowerFlex 755TM non-regenerative bus supply is capable of precharging the total connected DC bus capacitance.
The chosen 480V AC PowerFlex 755TM non-regenerative supply, composed of two dual-density 2X modules and one single-density 1X module, meet
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 8, HD
Drive 2 PF755 20G…D096 4600 frame 6, HD
Drive 3 PF755TM 20G…D960 18000 frame 8, HD
Drive 4 PF755 20G…D022 1020 frame 5, HD
Drive 5 Kinetix 5700
2198-S086
2198-CAPMOD
560
2240
ND,
Cluster capacitor module
Bus Supply
PF755TM Non-regen
20JEH…D1K3
20JEH…D1K3
20JEH…D740 30000
quantity of 2, 2X modules
quantity of 1, 1X module
quantity of 1, 2X cap bank
Max External Capacitance 383100 0.2 sec precharge
Additional Capacitance 0 µF
Total External DC Bus Capacitance
(2)
(2) The calculated total external DC bus capacitance does not include the PowerFlex 755TM bus supply internal bus capacitance.
71420 µF
Total DC Bus Capacitance 101420 µF
Equivalent Total AC Output Amps
(3)
(3) Equivalent Total AC Output Amps is calculated by multiplying the Total Rated DC Amps * 0.9
2336.4 A RMS
Precharge OK
This System target µF/A Ratio 40 µF/A
This system calculated µF/A Ratio 43.4 µF/A
µF/A ratio OK 0 µF additional required
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