Allen-Bradley 1768-PA3 CompactLogix Power Supply

The Allen-Bradley 1768-PA3 provides essential backplane power for specialized CompactLogix 1768 controller systems. This module converts external AC or DC energy into the regulated voltages required for internal logic. It serves as the primary power source for the processor and local expansion modules. Because this unit uses specific 1768-series architecture, it is incompatible with standard 1769 power supplies. The robust design ensures stable operation for critical control tasks in industrial automation.

Technical Specifications

Functional Characteristics

The 1768-PA3 features a wide input range to accommodate varying global power standards. It specifically supports high-performance controllers like the L43, L43S, L45, and L45S. This power supply can energize up to eight local 1769 I/O modules simultaneously. Integrated overcurrent protection guards the hardware against electrical faults. Additionally, the unit utilizes a non-replaceable fuse to ensure safety during power surges.

Diagnostic Monitoring

A front-facing LED indicator provides immediate visual feedback on the system status. A steady green light confirms that the module is operating normally. Conversely, a red light indicates a failure in the backplane power delivery. If the LED remains dark, the module has likely lost incoming power. These diagnostics simplify troubleshooting and reduce downtime during maintenance cycles.

Installation Guidelines

Users should install the 1768-PA3 directly to the left of the 1768 controller. This placement ensures the shortest path for high-speed data and power distribution. The chassis supports both horizontal and vertical mounting to fit different cabinet layouts. Proper clearance around the unit is necessary to maintain efficient cooling via natural convection.