Allen-Bradley 1769-PA4 CompactLogix Power Supply

Allen-Bradley 1769-PA4 CompactLogix Power Supply Product Introduction

The 1769-PA4 from Allen-Bradley is a robust AC power supply designed for the CompactLogix 1769 I/O system. This 1769-PA4 power supply converts 120/220V AC input into regulated DC backplane power, delivering 4.0A at 5V DC and 2.0A at 24V DC to connected processors and I/O modules. Its selectable input voltage range of 85 to 265V AC accommodates global power standards. Furthermore, this power supply can support up to eight modules on each side, totaling 16 modules for a single unit, making it an ideal choice for medium to large CompactLogix configurations.

Technical Specifications

The 1769-PA4 features a selectable input voltage range of 85 to 265V AC or 170 to 265V AC, with a nominal input of 120/220V AC. Its input frequency ranges from 47 to 63 Hz. Specifically, the power consumption is 200 VA at 120V AC and 240 VA at 240V AC, while power dissipation reaches 8W at 60°C. The current capacity is 4.0A at 5V DC and 2.0A at 24V DC, with a maximum inrush current of 25A at 132V AC. The 1769-PA4 also includes an internal replaceable fuse, compatible with Littelfuse 02153.15MXP or Wickmann 19195-3.15A. Additionally, the continuous isolation voltage from AC input to system is 265V, ensuring safe operation.

Mechanical and Environmental Parameters

Physically, the 1769-PA4 measures 118 x 70 x 87 mm (4.65 x 2.76 x 3.43 inches), increasing to 138 mm (5.43 inches) in height when including mounting tabs. It weighs approximately 525 g (1.16 lb) with shipping dimensions of 8 x 8 x 5 inches. Its open-style enclosure requires installation inside a protected cabinet. For wiring, this power supply accepts copper wire rated at 90°C, with solid wire from 22 to 14 AWG and stranded wire from 22 to 16 AWG. The operating temperature ranges from 0 to 60°C, with storage from -40 to 85°C, and a non-condensing humidity range of 5% to 95%. Moreover, the 1769-PA4 withstands operating shocks of 30G and vibrations of 5G at 10 to 500 Hz.

Installation and Mounting Guide

Mounting the Allen-Bradley 1769-PA4 is flexible, supporting both DIN rail and panel mounting options. First, select the correct input voltage range using the selector switch before energizing to prevent damage. Next, connect the power supply to adjacent modules using the tongue-and-groove slots and secure the bus lever. Importantly, the 1769-PA4 features a Power Supply Distance Rating of 8 modules, meaning any processor, communication, or I/O module must be within eight modules of this power supply. This power supply can power modules on both sides, allowing a maximum of 16 modules total. For configurations requiring more than 16 modules, add additional power supplies such as the 1769-PA2 or 1769-PB2. Always disconnect power before wiring and route input power cables from below the module.

Packaging List

Every shipment of the 1769-PA4 includes:

• One 1769-PA4 AC power supply module

• One removable terminal block with finger-safe cover

• One write-on identification label

Frequently Asked Questions (FAQ)

Q1: Which controllers are compatible with the 1769-PA4?
This power supply supports CompactLogix 1769-L3x processors and all 1769 Compact I/O modules, including digital, analog, and specialty modules.

Q2: How many I/O modules can the 1769-PA4 power?
The 1769-PA4 powers up to eight modules on each side, for a total of 16 modules. However, always verify the total current draw does not exceed 4.0A at 5V or 2.0A at 24V.

Q3: What is the Power Supply Distance Rating and why is it important?
The rating of 8 modules means no module can be placed more than eight positions away from the 1769-PA4. This ensures adequate power distribution and bus communication integrity across the assembly.

Q4: Can I replace the internal fuse on the 1769-PA4?
Yes, the fuse is replaceable. Use only compatible replacements such as Littelfuse 02153.15MXP or Wickmann 19195-3.15A to maintain proper protection.

Q5: What shipping methods are available?
We ship this Allen-Bradley power supply using trusted global carriers, including FedEx, UPS, and DHL, ensuring fast and secure delivery.