22 Rockwell Automation Publication 750-RM004A-EN-P - April 2018
Chapter 1 Selection Considerations
The DC power busbars and control busbars within the IP21/IP54 enclosed
PowerFlex 755TM common bus inverters are not mechanically or electrically
compatible with the busbars in any PowerFlex 700S enclosures. A transition
enclosure may be required if the new PowerFlex 755TM common bus inverters
must interface electrically and mechanically with existing common bus
converter/inverter power and control busbars. Contact an Authorized
Rockwell Automation Distributor specialist, Solution Partner, Recognized
System Integrator or Rockwell Automation account manager to discuss
engineered solutions for these PowerFlex 700S migrations.
AC Input Drive Power Source
Considerations
PowerFlex 700S frame 9…14 AC input drives include a standard iron core AC
input line reactor and are typically powered from an isolation transformer with
a solid ground X0 connection. This is the recommended power source and
grounding method. See the existing PowerFlex 700S AC input power source
wiring diagrams to confirm the following power source electrical information:
•kVA
•primary voltage
•secondary voltage
•% impedance
• secondary winding configuration
• grounding method, solid ground X0, resistance grounded, ungrounded
• other electrical equipment powered from the secondary of the
transformer
All PowerFlex 755TL/TR drives have an active front end converter with LCL
filter. To ensure the PowerFlex 755TL/TR drives will operate reliably with the
existing power source consider the following recommendations around power
source sizing, grounding, and shared AC loads.
IMPORTANT When a PowerFlex 755TM common bus inverter and PowerFlex 755TM bus
supply are used together, the DC bus bar ratings must match. PowerFlex
755TM 3000 A and 4700 A busbars are not compatible with each other. If any
4700 A busbars are used, then all frame 8…10 drives and bus supplies must
have the 4700 A DC bus option (-P46) installed. See publication DRIVES-
AT005, for detailed information regarding PowerFlex 755TM DC busbar
compatibility.
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