28 Rockwell Automation Publication 750-RM004A-EN-P - April 2018
Chapter 1 Selection Considerations
Example #1: External AC Input Branch Circuit Protection Device Compatibility Check
The following screen captures show the external circuit protection fuses that
are required for a PowerFlex 700S AC input frame 10, normal euty, 480VAC,
460 A, IP21 Rittal, catalog code ‘D460’ and the equivalent PowerFlex 755TL/
TR frame 8, normal duty, 480V AC, 505 A, catalog current code ‘F/G…D505’.
The PowerFlex 700S drive did not have factory-installed DC input fusing and
should have had either 600…1000 A time delay or 600…1300 A non-time
delay user-supplied branch circuit fuses.
The PowerFlex 755TL/TR drives have integral 900 A high speed
semiconductor fuses and may not require external branch circuit protection
devices. If external branch circuit fuses are reused or required, the
recommended fuse rating per the table should be 650…800 A time delay or
650…1500 A non-time delay fuses.
The existing external branch circuit protection fuses can be reused.
Figure 3 - PowerFlex 700S, IP21 Rittal Frame 10, 460 A, Normal Duty, Catalog Code ‘D460’,
Required External AC Input Fuses
IMPORTANT Figure 3 and Figure 4 are for illustrative purposes only. Do not use these for
fuse selection.
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