Rockwell Automation Publication 750-RM004A-EN-P - April 2018 31
Selection Considerations Chapter 1
Other Power Circuit Considerations
If your application requires the use of AC input contactors, motor output
contactors, bypass contactors, or other power circuit devices, refer to the
appropriate sections of the PowerFlex 750-Series Products with TotalFORCE
Control installation manual, publication 750-IN100
. It is important to ensure
that interrupting the AC input and/or motor output circuits of the PowerFlex
755T product is handled correctly to prevent malfunctions, damage, and
operational issues with the equipment.
Control Power
The PowerFlex 700S IP20/IP21/IP54 enclosed AC and DC input do not have
a factory supplied source of 120V AC or 240V AC control power. If 120V AC
or 240V AC control power was required for user installed electrical equipment
an external protected 120V AC or 240V AC power supply was required. The
PowerFlex 700S IP20/IP21/IP54 enclosed drives do not support control
power distribution busbars.
PowerFlex 755T products include standard control busbars for primary
control 240V AC 1 phase 50/60 Hz, auxiliary 24V DC busbars and User 120/
240V AC. Note the following regarding control power requirements:
• Primary 240V AC control power is required.
– PowerFlex 755TL/TR IP21/IP54 enclosed drives include standard
240V AC, 1 PH, 50/60 Hz control circuit transformer(s).
– PowerFlex 755TM common bus inverters IP21/IP54 require an
external user-supplied and protected 240V AC, 1 PH, 50/60 Hz
power supply. See Table 5 on page 33
. The PowerFlex 755TM
common bus inverter cannot be supplied with an optional internal
control transformer.
• 24V DC auxiliary control power is not required for basic operation of
the PowerFlex 755T products. The 24V DC auxiliary control power is
used to maintain logic and communication power if the 240V AC
primary control power is shut down. If 24V DC auxiliary power is used,
a properly sized external 24V DC power supply must be provided by the
user to energize the Auxiliary 24V DC busbars. Auxiliary 24V DC
power supply requirements must be calculated by the user. See
Specification and Features Comparison
on page 35 for PowerFlex 755T
auxiliary 24V DC power supply requirements.
• User 120/240V AC control power is not required for operation of the
PowerFlex 755T products. The User 120/240V AC busbars are not
used by the PowerFlex 755T products and if energized by a user-
supplied power supply is available for user-installed control devices.
IMPORTANT Refer to Wiring and Grounding Guidelines for Pulse-width Modulated
(PWM) AC Drives, publication DRIVES-IN001
, for detailed installation
planning guidelines.
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