![Rockwell Automation Allen-Bradley PowerFlex 700AFE Скачать руководство пользователя страница 168](http://html.mh-extra.com/html/rockwell-automation/allen-bradley-powerflex-700afe/allen-bradley-powerflex-700afe_user-manual_1475494168.webp)
168
Rockwell Automation Publication 20Y-UM001F-EN-P - April 2017
Appendix C
Application Notes
Paralleling AFEs
The power of the AFE input group can be increased by connecting several
groups in parallel. Paralleling refers to AFE units connected on the same input
transformer and the same DC bus. No communication between the units is
required—they work independently.
Paralleling is typically used when the power range of one frame size is not
enough, or when redundancy is needed. For additional information, see Drives
in Common Bus Configurations, publication
Guidelines for AFEs in IP20 2500 MCC Style Enclosure
Follow these guidelines for paralleling AFEs in IP20 2500 MCC Style
enclosures:
• For AFEs in IP20 2500 MCC Style enclosures, a maximum of two AFEs
of the same power size (for example, two Frame 10 AFEs) and same
voltage class can be paralleled.
• Each AFE must have its own LCL filter.
• Each AFE must have its own short circuit protection on AC and DC
sides. See
for fusing information. When paralleling, you
must check the sufficient short circuit capacity of the system.
• Derate the AFE units by 5% of their power rating.
• Configure the following parameters for parallel operation:
– Set Parameter 42 - [Modulation Type] to ‘3’.
– Set Parameter 82 - [Ground I Lvl] to 100%.
– Set Parameter 85 - [Droop] to 5% for current sharing of the AFEs.
– Set Parameter 86 - [PWM Synch] to ‘1’ to reduce circulating currents
between AFEs connected to the same DC bus and fed from the same
power source.
• If one of the paralleled AFEs is isolated from the AC and DC voltages,
you must isolate the AC input and DC output. The AC input can be
isolated with a circuit breaker or a disconnect switch. Contactors are not
suitable for isolating the AC input because they cannot be locked in the
safe position. The DC output can be isolated with a disconnect. A load
isolation switch or safety isolation switch can be used to isolate the
precharging circuit from the AC input.
• Each AFE must use a separate precharging circuit, precharging control
switch, DC bus output fusing, and main contactor.
Each AFE controls its own precharging and main contactor. Therefore,
it is possible to disconnect the AFE when other parallel AFEs are
powered up but not modulating.
Содержание Allen-Bradley PowerFlex 700AFE
Страница 8: ...8 Rockwell Automation Publication 20Y UM001F EN P April 2017 Table of Contents Notes ...
Страница 124: ...124 Rockwell Automation Publication 20Y UM001F EN P April 2017 Chapter 4 Programming and Parameters Notes ...
Страница 136: ...136 Rockwell Automation Publication 20Y UM001F EN P April 2017 Chapter 5 Troubleshooting Notes ...
Страница 158: ...158 Rockwell Automation Publication 20Y UM001F EN P April 2017 Appendix A Supplemental Information Notes ...
Страница 164: ...164 Rockwell Automation Publication 20Y UM001F EN P April 2017 Appendix B HIM Overview Notes ...
Страница 180: ...180 Rockwell Automation Publication 20Y UM001F EN P April 2017 Index by number 120 linear list 120 viewing 163 ...
Страница 184: ...184 Rockwell Automation Publication 20Y UM001F EN P April 2017 Index Notes ...
Страница 185: ......