Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022 17
Chapter 2
Regenerative Bus Supply Configuration
This system uses a PWM-controlled IGBT converter for full regeneration of power to the AC line. The regenerative bus supply puts energy back onto
the distribution system instead of dissipating energy with resistor braking technology. This configuration provides low AC line harmonics and can be
used to meet IEEE-519 when used with the appropriate filtering.
Supported Products
At the time of publication, the following products are supported.
Typical System Configurations
This section describes typical configurations for the PowerFlex 755TM regenerative bus supply. The common DC bus configuration includes one
regenerative bus supply powering one or more inverters that are shown in this chapter’s supported products table.
It’s recommended that a dedicated isolation transformer is used that only supplies AC power to the regenerative bus supply. If other non-linear
(diode/SCR rectifiers) or active front end (AFE) AC loads are connected to the secondary of the isolation transformer, additional line reactors may be
required. See AC Power System Resonance Conditions on page 20
for more information.
The PowerFlex 755T regenerative bus supply can be used with solid grounded, high-resistance grounded and ungrounded AC power sources. Solid
grounded and resistance grounded power sources are recommended for typical grid powered AC sources to improve electrical safety, ease of
ground fault detection, and to reduce unbalanced voltages.
Ungrounded (floating ground) AC power sources are typically used for shipboard isolated power systems that aren’t earth grounded.
Resistance grounded and ungrounded (floating ground) power sources may require additional user supplied circuits and optional bus conditioners
(-P50 or -P51).
Bus Supply Products Voltage Class Supported Inverters Inverter DC Bus Overvoltage Trip
(1)
(1) DC bus voltage control methods may be required to limit the maximum routine system DC bus voltage to less than the lowest inverter DC bus overvoltage trip level. See
Appendix D
for more information.
PowerFlex 755TM Regenerative Bus
Supply (20J…)
(2)
Frames 6…15
(3)
(2) PowerFlex 755TM bus supply converter input type (position 5 of catalog number) = 6 (frame 6…7 Regenerative and Low Harmonic AFE, 755TM Bus Supplies) or F (frame 8…15
Regenerative and Low Harmonic AFE, 755TM Bus Supplies).
(3) PowerFlex 755T regenerative bus supply frame 6 is a panel mounted device that requires additional external AC input power conditioning equipment. If frame 6 regenerative bus
supplies are used, see the Installation Manual, publication 750-IN100
, for additional installation and external device information.
400/480V AC
400/480V AC PowerFlex® 750-Series: frames 2…7
(4)(5)
(4) PowerFlex 750-Series input type (position 5 of catalog number) = 1 (frames 2…4 AC input with precharge, includes DC terminals) or, 4 (frames 5…7 DC input with precharge).
(5) At this time, frame 1 drives aren’t recommended for use with common DC bus systems.
815V DC
400/480V AC PowerFlex 755TM: frames 8…15
(6)
(6) PowerFlex 755TM input type (position 5 of catalog number) = D (common bus with DC precharge) or E (common bus without DC precharge). If DC input disconnect switches are
applied to inverters, you must select code 'D' common bus with DC precharge.
815V DC
Kinetix 5700 single-axis servo drives: (2198-Sxxx-ERSx) 810V DC
Kinetix 5700 dual-axis servo drives: (2198-Dxxx-ERSx) 810V DC
600/690V AC
600V AC PowerFlex 750-Series: frames 3…5
(4)(7)
(7) 600V AC frame 3…5 inverters can’t be used on 690V AC systems. See Appendix D for more information.
1013V DC
600/690V AC PowerFlex 750-Series: frames 6…7
(4)
1162V DC
600/690V AC PowerFlex 755TM: frames 8…15
(6)
1172V DC
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