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The 1756-PA75R ControlLogix AC Redundant Power Supply provides a robust and scalable power solution for high-availability industrial automation systems. This high-efficiency module ensures continuous, uninterrupted power to the ControlLogix chassis, effectively eliminating single points of failure. Designed for easy integration and seamless hot-swapping, it delivers maximum uptime for critical process, motion, and discrete applications.
All regulated voltages necessary for any ControlLogix module to operate in the chassis
Limited hold-up time for fluctuations in incoming line power
Enables orderly system shutdown by signaling modules in the chassis of imminent voltage failure
The Allen-Bradley 1756-PA75R is an AC redundant power supply module for Rockwell Automation ControlLogix systems. In industrial applications that do not tolerate power interruptions—such as continuous petrochemical refining, power plant boiler control, and pharmaceutical production lines—even a momentary control system shutdown can cause production loss or safety hazards. This module is engineered specifically for these continuous uptime requirements. Operating in pairs online, two 1756-PA75R modules utilize internal control logic to establish a dual hot-standby setup. Under normal operations, both units share the chassis load; if one unit fails due to power loop disruption, upstream breaker trips, or internal component damage, the other instantly assumes the full backplane load. This configuration eliminates single points of failure in the power supply, ensuring continuous control system operation.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1756-PA75R ControlLogix AC Redundant Power Supply Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas Exploration
Used in Emergency Shutdown (ESD) systems for offshore drilling platforms and onshore gathering stations to ensure the control system remains powered during main supply switchovers or failures.
Petrochemical & Refining
Used in Distributed Control Systems (DCS) for continuous reaction units like catalytic cracking and distillation columns, preventing process interruptions and raw material spoilage caused by power flickers.
Thermal & Nuclear Power Generation
Used in Boiler Management Systems (BMS) and turbine control systems to ensure power generating units remain stably controlled and safely operated during main grid fluctuations.
Iron & Steel Metallurgy
Used in blast furnace blower control, continuous casting lines, and cooling systems in high-voltage/high-heat zones to prevent molten metal solidification and equipment damage during power failures.
Semiconductor & Wafer Fabrication
Used in cleanroom Environmental Control Systems (HVAC) and specialized gas delivery setups, ensuring wafer photolithography and etching processes remain in an absolutely stable environment.
Pulp & Paper Industry
Used in continuous tension and speed control systems for Fourdrinier paper machines and large pulpers, avoiding paper breaks and material jamming caused by power fluctuations.
When using the 1756-PA75R, ensure it is configured in pairs with a 1756-PSCA2 adapter and 1756-CPR2 redundant cables. Each power supply must be connected to an independent AC power source to achieve true supply redundancy. During online hot-swapping, never disconnect or remove both power supplies simultaneously. Additionally, regularly inspect the front panel LED status and maintain proper ventilation to prevent dust buildup and overheating.
The Allen-Bradley 1756-PA75R is a highly reliable AC redundant power supply module designed for ControlLogix systems, featuring off-chassis mounting and hot-swappable, 0 ms hot-standby capabilities to ensure uninterrupted power in critical industrial environments. You can find more information about this product on the Allen-Bradley website.
The 1756-PA75R is a ControlLogix AC Redundant Power Supply manufactured by Allen-Bradley.
What is the main function of the 1756-PA75R?
It provides internal operating power to modules in a ControlLogix chassis and ensures uninterrupted system operation during a single power supply failure through redundant configuration.
How to use redundant power products like the 1756-PA75R?
Typically, two 1756-PA75R modules must be used in pairs and connected to a single 1756-PSCA2 redundant power supply chassis adapter via dedicated 1756-CPR2 redundant cables before connecting to the chassis.
Does the 1756-PA75R support hot-swapping?
Yes. In a running redundant system, you can directly replace one failed power supply without shutting down the PLC system.
What is the difference between 1756-PA75R and 1756-PB75R?
The difference lies in the input power type: 1756-PA75R uses Alternating Current (AC) input, while 1756-PB75R uses Direct Current (DC, usually 24V) input.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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