24 Rockwell Automation Publication 750-RM004A-EN-P - April 2018
Chapter 1 Selection Considerations
Power Source Grounding
The PowerFlex 755TL/TR drive safety ground (PE terminal) must be
connected to the power system ground. Ground impedance must conform to
the requirements of national and local industrial safety regulations and/or
electrical codes. Check the integrity of all ground connections periodically.
PowerFlex 700S AC input drives could be used with various grounding
methods. PowerFlex 755TL/TR drives can be used with similar grounding
methods. There are special considerations depending on the power source
grounding method. A single point (PE only) grounding scheme should be
used. Some applications may require alternate grounding schemes. These
applications include installations with long distances between drives or drive
line-ups, which could cause large potential differences between the drive or
line-up grounds. See Wiring and Grounding Guidelines for Pulse-width
Modulated (PWM) AC Drives, publication DRIVES-IN001
, for more
information.
Use Table 3
as a guide to required power conditioning options for the
PowerFlex 755TL/TR drives. This table only refers to power conditioning as it
applies to AC power source grounding.
If you are using DC input common bus inverters, the power conditioning
requirements for the various grounding methods depend on the bus supply
converter being used. If you are using a PowerFlex 700AFE bus supply, see
Drives in Common Bus Configurations application technique, publication
DRIVES-AT002. If you are using a PowerFlex 755TM bus supply, refer to
Drives in Common Bus Configuration with PowerFlex 755TM Bus Supplies
application technique, publication DRIVES-AT005
.
Table 3 - AC Power Source Grounding Comparison
Power Source Grounding Method PowerFlex 755 TL/TR Drive Considerations
Wye secondary, X0 solid ground • DC Bus Conditioner not required.
• 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
• Specify power option code (–P50) DC Bus
Conditioner. The drive is factory-shipped with the DC
Bus Conditioner(s) installed within the drive
enclosure.
• 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
• Specify power option code (–P50) DC Bus
Conditioner. The drive is factory-shipped with the DC
Bus Conditioner(s) installed within the drive
enclosure.
• Power filter jumpers; PE-A/PE-A1/PE-A2, and PE-B1
jumpers must be set per publication 750-IN100
.
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