Allen Bradley 1756-PB75R ControlLogix Redundant Power Supply

Product Overview

The Allen Bradley 1756-PB75R functions as a high-capacity redundant power supply designed for the ControlLogix 1756 chassis system. This module provides critical power backup to prevent system-wide shutdowns in the event of a primary power source failure. It operates on a 24V DC nominal input and delivers 75 Watts of output power, ensuring that high-density I/O configurations and high-performance controllers remain operational under demanding industrial conditions.

Technical Specifications

Engineering Advantages

• Zero-Downtime Redundancy: The 1756-PB75R allows for a redundant power architecture. By pairing two units with a 1756-CPR2 cable, the system maintains continuous operation even if one supply loses power or malfunctions. This setup eliminates costly process interruptions in 24/7 manufacturing environments.

• High Current Delivery: This unit provides a substantial 13A capacity at 5.1V DC. This high current output supports large-scale chassis filled with power-hungry communication modules and specialty I/O cards without voltage drops.

• Thermal Efficiency: The module maintains a full 75W output even at maximum operating temperatures (60 °C). This thermal stability allows for installation in densely packed control panels where heat dissipation often limits hardware performance.

• Broad Chassis Compatibility: The design fits all Series B ControlLogix chassis, from the compact 4-slot (1756-A4) to the expansive 17-slot (1756-A17) versions, providing a standardized power solution across the entire facility.

• Advanced Surge Protection: The hardware manages inrush currents up to 30A, protecting sensitive backplane electronics from sudden power spikes during initial system startup.

FAQs

• Is the 1756-PB75R sold as 100% Brand New?

  Yes. We supply this power supply as 100% Brand New original equipment. It undergoes rigorous factory testing to meet all Allen Bradley performance standards before shipment.

• Do I need additional hardware for redundancy?

  To achieve true redundancy, you must use two 1756-PB75R supplies in conjunction with a 1756-CPR2 redundancy cable and a compatible power supply adapter for the chassis backplane.

• Can this unit replace a standard 1756-PB75?

  While the 1756-PB75R shares the 75W rating, the "R" designation specifically enables redundancy features. You can use it as a standalone supply, but its primary value lies in its ability to pair with another unit for high-availability systems.

• What are the mounting requirements for this module?

  This unit mounts directly to the left side of the ControlLogix chassis. Ensure adequate clearance for airflow and cable routing to the redundancy partner to maintain optimal operating temperatures.