The Allen-Bradley 1768-PA3 provides reliable backplane power for your CompactLogix system. This dual-input power supply accepts either AC or DC voltage. You get flexibility for global industrial applications. The module delivers up to 1.4 Amps at 24 Volts. This energizes the controller and I/O modules. It maintains stable operations in demanding environments. Engineers value its robust overcurrent protection features. The unit includes a soldered, non-replaceable internal fuse. You must also supply external overcurrent protection. This protects your investment from electrical faults.
Product Procurement & Buyer Guide
The 1768-PA3 solves key power distribution challenges. It accepts a wide voltage range from 85 to 265V AC. It also works with 108 to 132V DC inputs. This eliminates the need for multiple power supply variants. You simplify your global spare parts inventory. The module is designed exclusively for the 1768 product family. It works perfectly with controllers like the 1768-L43 and 1768-L45. You must never install this module with a 1769 power supply. Doing so will damage your system. Always install a 1768 controller first in the same bank.
This module requires careful power budgeting. The maximum input power is 120 VA or 120 W. Its typical efficiency rating sits at 75%. You should calculate your total backplane current draw. The module provides 1.4 Amps of backplane current. This limits the number of modules you can use. With 1769 Compact I/O modules, you can support up to eight units. You must verify the power supply distance rating for each module. This ensures every module receives adequate power. Failure to do so causes erratic system behavior.
Procurement teams should check the enclosure type. The 1768-PA3 uses an open-style enclosure. This means it requires installation in a suitable cabinet. You can mount the module on a DIN rail or directly on a panel. The unit has a wiring category of 1 for power ports. It accepts wire sizes from 14 to 22 AWG. Use stranded or solid copper wire rated for 167 degrees Fahrenheit. The maximum insulation strip length is 1.2 millimeters. This ensures a secure and reliable electrical connection. The shipping weight for this module is just 2 lbs.
Step-by-Step User & Installation Guide
Follow these steps for a safe installation. First, disconnect all power to the system. Verify that the cabinet is properly grounded. You must never work on live electrical equipment. Install the 1768 CompactLogix controller first. Place it in the same bank as the power supply. This is a critical requirement for system startup. Then mount the 1768-PA3 module onto the DIN rail. Press down firmly until it clicks into place. Alternatively, use the panel mount holes for secure attachment.
Next, prepare your input power wires. Use 14 to 22 AWG stranded copper wire. Strip the insulation to the required 1.2 millimeters. Connect the AC or DC power source to the input terminals. Follow the local electrical codes for this step. Verify the voltage matches the module’s requirements. The module accepts 85 to 265V AC at 47 to 63 Hz. It also accepts 108 to 132V DC. The maximum inrush current is 50 Amps for 85 to 132V AC. It can reach 80 Amps for 195 to 265V AC. Ensure your external circuit breaker can handle this.
After connecting power, check the LED status indicator. Apply power to the system. The single LED should turn solid green. This indicates correct operation. A red LED signifies a fault condition. You must then check the module’s power dissipation. The maximum dissipation is 30 Watts. Ensure adequate airflow around the unit. The module dissipates 7.5 Watts under typical loads. Monitor the module during its first few minutes of operation. Confirm it does not overheat. Finally, document the installation for future maintenance. This helps with troubleshooting later.
Logistics & Standard Packaging Details
