Rockwell Automation Publication 750-RM004A-EN-P - April 2018 29
Selection Considerations Chapter 1
Figure 4 - PowerFlex 755TR/TL Drive, Frame 8, 505 A, Normal Duty, Catalog Code ‘F/G…D505’,
Integral and Recommended External AC Input Fuses
Example #2: External DC Input Branch Circuit Protection Device Compatibility Check
The following screen captures show the external circuit protection fuses
required for a PowerFlex 700S DC input Frame 10, Normal Duty, 650V DC,
460 A, IP21 Rittal, catalog code ‘J460’ and the equivalent PowerFlex 755TM
common bus inverter, frame 8, normal duty, 650V DC, 505 A, catalog current
code ‘D/E…D505’.
The PowerFlex 700S drive did not have factory-installed DC input fusing and
should have had 900 A, non-time delay (Bussman) user-supplied branch circuit
fuses.
The PowerFlex 755TM common bus inverters have integral 1400 A high speed
semiconductor fuses and may not require external branch circuit protection
devices. If external branch circuit fuses are required or reused, the continuous
DC input current is 558A DC so the recommended fuse rating should be
700…1400 A, non-time delay fuses.
The existing external branch circuit protection fuses can be reused.
Figure 5 - PowerFlex 700S, IP21 Rittal Frame 10, 460 A, Normal Duty, Catalog Code ‘J460’,
Required External DC Input Fuses
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