Allen Bradley 1756-PA75R ControlLogix Redundant Power Supply Module

Product Overview

The Allen Bradley 1756-PA75R serves as a specialized power solution for high-availability ControlLogix systems. This redundant power supply module ensures continuous system operation by allowing two units to share the load within a single redundant power system. If one supply fails, the other immediately assumes the full load to prevent controller shutdown. We provide this module in 100% Brand New original condition to guarantee the highest level of system uptime for your critical infrastructure.

Technical Specifications

This module operates across a wide AC input range and delivers stable DC power to the ControlLogix backplane even during brief voltage fluctuations.

Engineering Advantages

• Fault-Tolerant Architecture: The 1756-PA75R enables a true redundant power configuration. By pairing two modules via a redundancy cable, you eliminate the power supply as a single point of failure in your automation rack.

• Extended Hold-Up Time: The unit provides a 2-cycle hold-up time. This duration allows the system to ride through minor power dips or brownouts without triggering a CPU reset, maintaining process continuity.

• Reinforced Isolation: With a 250V continuous isolation rating featuring reinforced insulation, the module protects sensitive backplane electronics from input-side electrical noise and surges.

• Global Voltage Compatibility: The wide input range (85–265V AC) allows for seamless deployment in various international power grids without the need for additional step-down transformers.

FAQs

• How many 1756-PA75R modules do I need for a redundant system?

  A fully redundant system requires exactly two 1756-PA75R power supplies. These units connect through a 1756-CPR2 redundancy cable to synchronize their outputs and monitor each other's health.

• Can I install this module directly into a standard ControlLogix chassis slot?

  No. Unlike standard power supplies that mount directly to the left side of the chassis, the 1756-PA75R is a separate component that typically mounts on a 1756-PSCA2 chassis adapter or is used in conjunction with specific redundant power hardware. Always verify your chassis configuration before installation.

• What is the recommended conductor screw torque for the input wiring?

  To ensure a stable electrical connection and prevent overheating at the terminals, tighten the conductor screws to exactly 0.565 Nm (5.0 lb-in).

• Is this an original Allen Bradley unit?

  Yes. We supply only 100% Brand New original Allen Bradley 1756-PA75R modules in factory packaging. This ensures that the internal electrolytic capacitors and switching components are at peak health for long-term service.