The Allen-Bradley 1756-PA72 is a standard AC power supply module designed for the ControlLogix 1756 chassis system. It provides regulated backplane power to support CPU modules, communication modules, and I/O modules installed in the chassis. The unit accepts a wide AC input range and converts it into multiple DC backplane voltages required by ControlLogix components.
Features
Designed for ControlLogix 1756 chassis systems
Universal AC input range: 85-265V AC
Provides 75W of total output power at 60 degC
Supports multiple backplane voltage rails: 5.1V DC, 3.3V DC, 24V DC, and 1.2V DC
Built-in diagnostic indicators for system monitoring
Integrated protection against electrical noise and voltage fluctuations
Applications
Assembly and bottling lines
CNC and precision metalworking machines
Material handling systems, including conveyors and robotic palletizers
Process skids for chemical, water, and oil/gas industries
Automotive robotics and welding cells
Technical Specifications
Model
1756-PA72
Input Voltage Range
85-265V AC
Nominal Input Voltage
120/240V AC
Input Frequency
47-63 Hz
Max Input Power
100 W
Output Power
75 W at 60 degC
Output Current (3.3V DC)
4 A
Output Current (5.1V DC)
10 A
Output Current (24V DC)
2.8 A
Operating Temperature
0 to 60 degC
Isolation Voltage
250V Continuous
Installation Guidelines
Ensure the ControlLogix chassis is properly mounted and grounded according to Rockwell Automation guidelines.
The power supply must be installed in the dedicated leftmost slot of the chassis.
Align the module's circuit board with the chassis card guides.
Slide the module until it is flush with the chassis and the backplane connector is fully seated.
Secure the module by tightening the top and bottom Phillips head screws to a torque of 0.8 N-m (7 lb-in).
Keep the protective label on the top vents during panel fabrication to prevent metal shavings from entering the unit.
FAQ
What is the input voltage range of the 1756-PA72?
The module supports a universal input range of 85-265V AC (nominal 120/240V AC) at 47-63 Hz.
Where should it be installed in the chassis?
The module must be installed in the leftmost slot of the ControlLogix chassis. This slot is dedicated to the power supply and does not occupy a standard I/O slot.
What is the maximum power output?
The total output power is 75 W at 0–60 degC. Ensure the combined power consumption of all modules in the chassis does not exceed the power supply's rated capacity.
