Rockwell Automation 1768-PA3_PB3 CompactLogix Power Supplies Installation Instructions User Manual
Page 6
6 1768 CompactLogix Power Supplies
Publication 1768-IN001B-EN-P - July 2006
1768-PA3 Power Supply
The 1768-PA3 power supply is a dual-input power supply that operates in multiple
ranges. The 1768-PA3 offers the following input power supply options:
• 85...265V ac
• 108...132V dc
1768-PB3 Power Supply
The 1768-PB3 power supply is a single-input power supply. The 1768-PB3 offers
the following input power supply range:
• 16.8...31.2V dc
About the Power Supplies in a CompactLogix System
The CompactLogix system is set up differently than other Logix systems. The
following are considerations specific to the CompactLogix system:
• Both the 1768-PA3 and the 1768-PB3 power supplies require that a 1768
CompactLogix controller be installed in the same bank as the power supply
before the system is powered.
The power supply sends 24V dc to the controller located either immediately to the
right of the power supply or immediately to the right of the communication and
motion modules.
Power
Supply
Communication or
Moti
on Modul
e
Communication or
Moti
on Modul
e
Controller
1769
I/O
Module
1769
I/O
Module
Power supply provides 24V dc power to
controller through the backplane.
1768 CompactLogix System
Controller provides 5V dc
to communication and
motion modules.
Controller provides
5V/24V dc to 1769 I/O
modules.