What Makes the 1756-PA72K the Backbone of Your ControlLogix Chassis?
Is your ControlLogix chassis sitting idle because the power supply failed? The Allen-Bradley 1756-PA72K is the AC power supply module that keeps your 1756 backplane alive. It accepts a nominal 120-240 Volts AC input and delivers a maximum output of 75 Watts at 60 Celsius. This is a practical, ready-to-ship solution for oil, gas, and industrial automation sites that cannot afford downtime.
Key Parameters That Matter on the Plant Floor
The 1756-PA72K operates across an 85-265 Volts AC range, so it tolerates the voltage swings common in remote oil and gas installations. Input frequency spans 47-63 Hertz, matching standard industrial power worldwide. Maximum input power is 100 Watts. The module provides current capacity of 1.5 Amps at 1.2 Volts DC, 4 Amps at 3.3 Volts DC, 10 Amps at 5.1 Volts DC, and 2.8 Amps at 24 Volts DC. Hold-up time reaches 5 cycles at 85 Volts AC and 6 cycles at 120, 200, or 240 Volts AC, giving your processor time to ride through brief interruptions.
| Specification | Value |
|---|---|
| Input Voltage | 120-240 Volts AC |
| Voltage Range | 85-265 Volts AC |
| Input Power | 100 Watts |
| Input Frequency | 47-63 Hertz |
| Output Power | 75 Watts at 60 Celsius |
| Current Capacity | 1.5 A at 1.2 VDC; 4 A at 3.3 VDC; 10 A at 5.1 VDC; 2.8 A at 24 VDC |
| Dimensions | 5.5 x 4.4 x 5.7 inches |
| Weight | 2.5 pounds (1.1 kilograms) |
| Operating Temperature | 32-140 Fahrenheit (0-60 Celsius) |
Where the 1756-PA72K Fits in Oil and Gas Automation
This module mounts on the left side of a 1756 chassis and plugs directly into the backplane. It is compatible with chassis Series A or B, including the 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17. In upstream oil and gas, the 1756-PA72K often powers ControlLogix racks that manage pump stations, wellhead monitoring, and pipeline pressure control. The wide 85-265 Volts AC range means the same module works on 120 VAC and 240 VAC feeds without reconfiguration. For midstream compressor stations, the 75 Watt output at 60 Celsius supports dense I/O configurations in compact panels. When a power supply fails, a fast-dispatch spare from Oil AutoTech keeps your line running.
Installation and Wiring Essentials
Mount the 1756-PA72K on the left side of the chassis. Use 14 AWG solid or stranded copper wire rated for 194 Fahrenheit or greater, with maximum insulation of 3/64 inches. Tighten conductor screws to 5 pounds on an inch. The module has an open enclosure, so install it inside a protective enclosure that requires a tool to access. Keep ambient temperature at or below 60 Celsius and humidity between 5 and 95 percent non-condensing. The 1756-PA72K carries a T4 North American temperature code.
Reliability and Maintenance for Critical Processes
Vibration tolerance is 2G at 10 to 50 Hertz, and shock ratings are 30G operating and 50G non-operating. These values suit the mechanical stress found on skids and offshore platforms. Inspect connections periodically and verify that enclosure cooling paths remain clear. Because the 1756-PA72K is a non-redundant supply, many operators keep a spare on the shelf. Oil AutoTech offers hands-on technical selection help and quick worldwide delivery for spares when you need them.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
FAQ
What input voltage does the 1756-PA72K require?
It accepts a nominal 120-240 Volts AC input and operates across an 85-265 Volts AC range.
How much output power does the 1756-PA72K provide?
It delivers a maximum of 75 Watts at 60 Celsius.
Which chassis work with the 1756-PA72K?
It fits Series A or B chassis, including the 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17.
What wire size should I use?
Use 14 AWG solid or stranded copper rated for 194 Fahrenheit or greater, with maximum insulation of 3/64 inches.
Can the 1756-PA72K handle voltage fluctuations?
Yes. The 85-265 Volts AC range and 47-63 Hertz input frequency cover common industrial supply variations.
