Diagram Notes:
• AC and DC circuit protection devices are required but not shown. See AC and DC Circuit
Protection Devices on page 53 for more information.
• The bus supply must be sized to power all inverters connected to the DC bus. See DC Bus
Capacitance Calculation Method on page 87 for more information.
• Additional DC bus capacitance may be required. See Appendix A
for more information.
• Additional DC bus conditioner units may be required. See Table 1 on page 19
.
• If inverter DC input disconnect devices are used, the inverter must have a precharge circuit.
• High-resistance grounded power sources require a ground fault indicator filter. See
Appendix B
for more information.
• Delta secondary power sources require a Zig-Zag Transformer and ground fault resistor (GFR)
to convert the ungrounded power system to resistance grounded. See Appendix B
for more
information.
Solid Grounded AC Supply
3-Phase
AC Supply
Isolation
Transformer
Common DC Bus Configuration
Bus Supply Converter
Precharge
Bus
Cond
PowerFlex 755TM
Regenerative Bus Supply
Cap
Bank
DC
Disconnect
Kinetix 5700
Servo Drives
Single Dual
Common
Mode Cores
AC InverterAC Inverter
Precharge
Isolation
Transformer
3-Phase
AC Supply
High Resistance Grounded AC Supply
Ground Fault
Detector and
Filter
Ungrounded AC Supply
Isolation
Transformer
3-Phase
AC Supply
Ground Fault
Detector and
Filter
Zig-Zag
Transformer
Cap
Module
Bus
Module
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