ALLEN BRADLEY 1756-PA72 POWER SUPPLY

Dependable Power Delivery with the Allen-Bradley 1756-PA72 Power Supply Module

The Allen-Bradley 1756-PA72 is a reliable standard power supply module designed for ControlLogix systems. It plays a crucial role in providing stable power to the modules mounted within the chassis. Positioned on the left side of the chassis, this unit initiates power distribution to all modules in the rack.

This module supports an input voltage range of 85 to 265 volts AC, making it highly adaptable to global industrial environments. Whether you’re operating on 120V or 240V lines, the 1756-PA72 can adjust without requiring manual voltage selection. This auto-ranging capability adds convenience and reduces setup time.

The nominal input voltage is rated at 120/240VAC, and it operates within a frequency range of 47 to 63 Hertz. This wide tolerance makes it suitable for a variety of installations, especially those where voltage or frequency fluctuations might occur.

Its power output capacity is rated at 75 watts when operating at 60°C, ensuring consistent performance even under warm environmental conditions. This makes the unit dependable in applications where elevated temperatures are common.

In terms of current distribution, the module delivers 4 amps at 3.3V DC, 10 amps at 5.1V DC, and 2.8 amps at 24V DC. This multi-voltage support makes it ideal for ControlLogix chassis that contain modules requiring different voltage levels for operation.

The 1756-PA72 can handle up to 30 amperes of inrush current, helping to protect the system during power-up. This feature is essential for preventing startup-related voltage drops or system instability in larger installations.

With an input power requirement of 100 watts, the module strikes a good balance between energy consumption and output efficiency. It provides sufficient power to drive the chassis without overloading your facility’s power system.

One of the key advantages of this module is its hold-up time—up to 6 cycles at various voltage levels. This helps maintain power briefly during short interruptions, ensuring smooth operation and system integrity.

Built for ControlLogix Series A or B chassis, the 1756-PA72 fits easily and securely into place. Its installation is straightforward and tool-free, simplifying both upgrades and new installations in industrial automation setups.

In terms of dimensions, the module measures 14 x 11.2 x 14.5 cm, or approximately 5.51 x 4.41 x 5.71 inches. This compact size makes it easy to fit into control cabinets without occupying excess space. It’s also lightweight at just 0.95 kg (2.10 lbs), which aids in hassle-free handling and mounting.

The module does not feature an external enclosure, making it suitable for protected environments such as closed control cabinets. This open-style design supports efficient cooling and airflow around the component.

It maintains reliable operation across a wide temperature range of 0 to 60°C (32 to 140°F). Whether installed in a climate-controlled panel or on a shop floor with fluctuating temperatures, it maintains consistent functionality.

The 1756-PA72 also includes an isolation voltage rating of 250 volts continuous, which enhances protection against transient voltages and contributes to long-term module durability. It plays a key role in maintaining the integrity of sensitive components connected within the system.

By positioning this power supply on the left side of the chassis, it becomes the core source of power for the entire ControlLogix system. Its role is foundational, as no module can operate without a stable and clean power source like the 1756-PA72.

Whether you're running motion control, process automation, or machine control applications, this power supply ensures that your system starts with a reliable base. It serves both low and moderate power requirements efficiently.

Thanks to Rockwell Automation’s engineering quality, the Allen-Bradley 1756-PA72 is trusted in facilities where downtime is costly and performance consistency is a must. It’s been built and tested for rugged industrial use.

The lack of a built-in enclosure means it should be installed in accordance with proper industrial standards. When housed in a well-ventilated panel, it remains stable and helps protect connected devices from the effects of unstable power.

With the ControlLogix platform’s modularity, this power supply easily integrates with various processors, communication modules, and I/O cards. It’s flexible enough to meet the needs of both small and large-scale systems.

Because it is a standard module in Allen-Bradley's ControlLogix family, it is widely available and supported globally. Replacement parts and technical documentation are easy to source, making maintenance and system scaling straightforward.

In summary, the Allen-Bradley 1756-PA72 is a dependable power supply module built for tough industrial conditions. Its wide input range, efficient power output, and compact footprint make it a preferred choice for automation professionals.