Allen-Bradley 1756-PA72 ControlLogix AC Power Supply Module

Product Overview

The Allen-Bradley 1756-PA72 serves as the primary energy source for Allen-Bradley ControlLogix 1756 chassis systems. This robust AC power supply converts universal line voltage (120/240V AC) into the specific DC backplane voltages (3.3V, 5.1V, and 24V DC) required to operate processors, I/O modules, and communication adapters. It mounts directly to the left side of the chassis, providing a centralized power solution for high-density automation racks. We supply this unit in 100% Brand New and Original condition, ensuring your mission-critical control architecture receives stable, factory-certified power from the first day of installation.

Technical Specifications

Engineering Advantages

The 1756-PA72 manages complex power requirements in demanding industrial environments through its advanced electrical architecture:

• Universal Voltage Versatility: The module accepts a wide input range from 85V to 265V AC. This allows global deployment across different power grids without requiring external step-down transformers or manual voltage switching.

• Superior Ride-Through Performance: The supply features a sophisticated "Hold Up" time of 5 to 6 cycles depending on input voltage. This prevents system resets during brief power dips or voltage sags, maintaining continuous process control during minor utility disturbances.

• High-Current Backplane Distribution: Delivering 10A at 5.1V DC, the 1756-PA72 provides ample current for large racks populated with power-hungry communication modules and high-density I/O. This high capacity reduces the need for redundant power configurations in standard applications.

• Built-in Transient Suppression: Internal circuitry isolates the chassis backplane from line noise and surges with a 250V continuous isolation rating. This barrier protects expensive processors and sensitive analog modules from electrical interference common in heavy industrial facilities.

• Seamless Chassis Integration: The unit snaps securely into the dedicated power supply slot on the far left of the 1756 chassis. It utilizes a direct-connect terminal block for AC wiring, simplifying installation and maintenance in cramped control cabinets.

FAQs

• Can I use the 1756-PA72 with older ControlLogix chassis? Yes. The 1756-PA72 maintains full compatibility with Series A, B, and C chassis, including the 1756-A4, A7, A10, A13, and A17 models. It provides a direct upgrade or replacement path for legacy 1756 power supplies.

• Does this unit require a battery for operation? No. The 1756-PA72 manages power conversion purely through its internal semiconductor architecture. It does not require a battery. The processors and memory modules within the chassis handle their own data retention.

• How do I verify the "Brand New" condition? We guarantee every 1756-PA72 arrives in its original Allen-Bradley factory box with intact security seals. Every unit carries a unique GTIN (10612598172594) for full manufacturer traceability, confirming the unit has zero field runtime.

• What happens if my current requirement exceeds 75W? The 1756-PA72 provides a maximum of 75W. If your total chassis configuration (calculated via Rockwell’s Integrated Architecture Builder) exceeds this limit, you must utilize a larger power supply or split the modules into two separate chassis.