1756-PB50 | Allen-Bradley | ControlLogix Standard DC Power Supply Module

Product Overview

The 1756-PB50 serves as a high-capacity DC power supply specifically engineered for the Allen-Bradley ControlLogix platform. It converts a nominal 24V DC input into the multiple backplane voltages required by processors, I/O modules, and communication adapters within a 1756 chassis. This module provides the necessary current for high-density configurations, ensuring stable logic-side performance across the entire backplane. We supply this unit as 100% Brand New and factory-original, guaranteeing peak electrical efficiency and system integrity.

Technical Specifications

The 1756-PB50 utilizes a robust switching architecture to maintain stable outputs even during input voltage fluctuations.

Engineering Advantages

• Ride-Through Capability: The integrated capacitors provide a hold-up time of up to 40ms. This prevents nuisance controller resets during momentary DC bus brownouts or power transitions, maintaining process uptime in volatile power environments.

• High-Density Current Delivery: This module delivers a substantial 8A at the 5.1V backplane rail. This high output supports fully populated 17-slot chassis containing multiple high-drain communication modules and processors without requiring a secondary power source.

• Thermal Resiliency: The 1756-PB50 features advanced heat dissipation components. It operates at full capacity in ambient temperatures up to 50 °C and supports derated operation up to 60 °C, making it suitable for unconditioned industrial enclosures.

• Direct Chassis Integration: The unit snaps directly into the dedicated power supply slot on the left side of any standard 1756 ControlLogix chassis. This design eliminates external wiring for logic power and ensures a low-impedance connection to the backplane.

FAQs

• Can I use the 1756-PB50 in a redundant power supply configuration?

  No. The 1756-PB50 is a standard power supply. For redundant applications, you must use the 1756-PB75R or 1756-PSCA2 adapter system. This module is intended for standalone chassis power.

• What type of fuse or circuit protection do you recommend for the input?

  To protect against the 30A inrush current and potential short circuits, install a fast-acting fuse or a high-magnetic trip circuit breaker rated appropriately for the 24V DC supply line.

• Does this module provide power for field-side devices?

  No. The 1756-PB50 only provides power to the chassis backplane for internal module logic. You must provide a separate 24V DC source to power field-side actuators, sensors, and I/O terminal blocks.

• How do I verify if the power supply is functioning correctly?

  The front panel includes a green "DC Power" LED. If the LED is off, check the 24V DC input terminals for voltage and ensure the module is fully seated in the chassis.