30 Rockwell Automation Publication 750-RM003A-EN-P - April 2018
Chapter 1 Selection Considerations
Control Power
The PowerFlex 700AFE IP20/IP21 enclosed DC bus supplies have a standard
internal control transformer. The control transformer is sized to supply
240VAC and 120V AC for the PowerFlex 700AFE only. The PowerFlex
700AFE does not support control circuit bus bars.
The PowerFlex 755TM bus supplies do not come with a standard internal
240V AC control transformer. The PowerFlex 755TM control bus system
includes as standard; primary control 240V AC bus bars, Auxiliary 24V DC
bus bars, and User 120/240V AC bus bars.
• 240V AC primary control power is required. 240V AC control power
can be supplied from an external source or from the optional control
transformer (option code –C1). If an external 240V AC power supply is
used, refer to Table 6 on page 31
. We recommend that the optional
internal control transformer is ordered with the PowerFlex 755TM bus
supply. If the control transformer option (-C1) is specified, the 240V
AC primary control power bus bars will be energized from the control
transformer.
• 24V DC auxiliary control power is not required for basic operation of
the PowerFlex 755TM bus supply. The 24V DC auxiliary control power
is used to maintain logic and communication power if the 240VAC
primary control power is shut down. If 24V DC auxiliary power is used,
you must provide an external properly-sized 24V DC power supply to
energize the auxiliary 24V DC bus bars. You must calculate auxiliary
24V DC power supply requirements. See Specification and Feature
Comparison on page 33 for PowerFlex 755TM auxiliary 24VDC power
supply requirements.
• User 120/240V AC control power is not required for operation of the
PowerFlex 755TM bus supply. The User 120/240V AC bus bars are not
used by the PowerFlex 755T product and if energized by a user-supplied
power supply is available for user-installed control devices.
Connections are made to the control bus bars using a 20-750-CTRLBUS-
CONN1 control bus connector. Taps from the control bus connector are rated
for 10 A.
External 240V AC control power requirements greater than 10 A total can be
made using the control bus connector, 0-750-MCTRLBUS-CONN2. This
connector is rated for 100 A to match the control bus rating.
To Next Page
Loading...
Need help?
General
