Rockwell Automation Publication 750-RM003A-EN-P - April 2018 23
Selection Considerations Chapter 1
See Table 3 to assist with modifying the existing installation and as a guide to
required power conditioning options for the PowerFlex 755TM bus supply.
This table only refers to power conditioning. There are also considerations for
the types of common bus inverters that are compatible. For more information,
refer to Drives in Common Bus Configuration with PowerFlex 755TM Bus
Supplies application techniques, publication DRIVES-AT005
for common
bus inverter drive compatibility.
Table 3 - Power Source Grounding Comparison
Power Source Grounding Method Existing PowerFlex 700AFE External Circuit
Modifications that may be required
PowerFlex 755TM Bus Supply Considerations
Wye secondary, X0 solid ground • Remove external DC Bus Conditioner unit(s).
• Remove Common Mode Choke at the DC output of the
AFE.
• Remove Common Mode Chokes at the DC input to
common bus inverter drives.
• Retain Common Mode Chokes at the AC output of the
common bus inverter drives.
• DC Bus Conditioner included as required.
• Confirm if external DC bus capacitor banks are
required and of the correct value. Remove/add/
modify per publication DRIVES-AT005
.
• Retain or install Common Mode Chokes at the AC
output of PowerFlex 750-series common bus inverter
as recommended in publication DRIVES-AT005.
• Power Filter Jumpers; PE-A/PE-A1/PE-A2, and PE-B1
jumpers installed per publication 750-IN100.
Wye secondary, X0 resistance grounded with ground
fault indicator
• Remove the external DC Bus Conditioner unit(s).
• Remove the Common Mode Choke at the DC output of
the AFE.
• Remove Common Mode Chokes at the DC input to
common bus inverter drives.
• Retain Common Mode Chokes at the AC output of the
common bus inverter drives.
• Specify power option code (–P50) DC Bus Conditioner.
The bus supply is factory-shipped with the DC Bus
Conditioner(s) installed within the enclosure.
• Confirm if external DC bus capacitor banks are
required and of the correct value. Remove/add/
modify per publication DRIVES-AT005.
• Retain or install Common Mode Chokes at the AC
output of PowerFlex 750-series common bus inverter
as recommended in publication DRIVES-AT005.
• Power filter jumpers; PE-A/PE-A1/PE-A2, and PE-B1
jumpers must be set per publication 750-IN100.
Delta secondary, ungrounded with artificial ground (zig-
zag) transformer and ground fault indicator
• Remove the external DC Bus Conditioner unit(s).
• Remove the Common Mode Choke at the DC output of
the AFE.
• Remove Common Mode Chokes at the DC input to
common bus inverter drives.
• Retain Common Mode Chokes at the AC output of the
common bus inverter drives.
• Specify power option code (–P50) DC Bus Conditioner.
The bus supply is factory shipped with the DC Bus
Conditioner(s) installed within the enclosure.
• Confirm if external DC bus capacitor banks are
required and of the correct value. Remove/add/
modify per publication DRIVES-AT005.
• Retain or install Common Mode Chokes at the AC
output of PowerFlex 750-series common bus inverter
as recommended in publication DRIVES-AT005.
• Power filter jumpers; PE-A/PE-A1/PE-A2, and PE-B1
jumpers must be set per publication 750-IN100.
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