Rockwell Automation Publication 750-RM004A-EN-P - April 2018 21
Selection Considerations Chapter 1
DC Input Inverter Considerations
PowerFlex 700S DC input drives are not supplied with precharging circuits. If
required, you must add the precharge circuits. PowerFlex 755TM common bus
inverters can be ordered with or without precharge circuits.
See the DC Input Electrical Cross Reference
on page 51 for PowerFlex 755TM
common bus inverter selection information.
DC power and control circuit busbars may not be available, standard, or
optional for PowerFlex 700S DC input drives and PowerFlex 755TM common
bus inverters. Use the following table to identify the existence and rating of DC
power and control busbars.
IMPORTANT If you have DC input PowerFlex 700S drives it is important to understand if
precharge circuits are used so you can choose the correct PowerFlex 755TM
common bus inverter precharge configuration. It is the responsibility of the
designer to make sure that the correct PowerFlex 755TM common bus
inverter precharge configuration is chosen. If you have concerns about your
DC input common bus PowerFlex 700S drive system configurations consult
an Authorized Rockwell Automation Distributor specialist, Solution Partner,
Recognized System Integrator or Rockwell Automation account manager to
discuss PowerFlex 700S DC input drive migration solutions.
ATTENTION: Applying a PowerFlex 755TM common bus inverter without
precharge with an existing common bus inverter DC disconnect or with no
method of safely precharging the DC bus capacitors in the drive may result in
serious damage to the DC bus supply and PowerFlex 755TM common bus
inverters.
WARNING: Failure to properly apply this equipment may cause dangerous
over currents, possible explosion, and arc flash conditions that can lead to
personal injury or death.
Table 2 - Power and Control Busbar Rating Comparison
Description PowerFlex 700S DC Input PowerFlex 755TM Common Bus Inverter
DC Power
Busbars
— (s) frames 8…10; 3000 A DC
(s) frames 11…12; 4700 A DC
(o) frames 8…10; 4700 A DC, specify power option code (-P46)
Control Power
busbars
— (s) Primary control 240V AC, 1 PH, 100 A
(s) Auxiliary 24V DC, 100 A
(s) User 120/240V AC, 1 PH, 100 A
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