Product Overview

The Allen Bradley 1756-PB72 functions as a high-performance DC-input power supply designed specifically for ControlLogix chassis. This single-slot module installs directly into the standard power supply slot on the left side of the rack, delivering regulated backplane power to drive CPUs, I/O modules, and communication cards. It sources 100% original, brand-new components to guarantee continuous uptime in demanding process control, automotive manufacturing, and utility automation facilities.

Technical Specifications

Engineering Advantages

• Mitigates Voltage Fluctuations: The wide input range (18-32V DC) protects the control system from heavy machinery voltage drops on the factory floor, ensuring the PLC remains online during DC grid strain.

• Simplifies Dense Rack Thermal Management: The high-efficiency design delivers full 75W output up to 60 degrees Celsius. This prevents localized hot spots in tight, unventilated enclosures and eliminates the need for external cooling fans.

• Eliminate Ground Loop Noise: The 250V reinforced insulation barriers separate the raw input power lines from the sensitive digital backplane. This stops electromagnetic interference (EMI) from corrupting analog I/O signals.

• Saves Footprint Space: The compact, single-slot mounting mechanism mounts directly to the chassis edge, leaving all standard slots open for operational I/O modules.

FAQs

• Can I use the 1756-PB72 in a system that requires AC power?

  No. This module accepts only DC input voltages (18-32V DC). Connecting this unit to AC mains will damage the internal circuitry. You must use an external AC-to-DC step-down transformer or source an AC-native ControlLogix power supply model instead.

• Does this power supply support hot-swapping or redundancy configurations?

  No. The 1756-PB72 is a standard single-slot power supply. You must power down the chassis completely before replacing or servicing this module. For redundant architectures, choose the 1756-PR2 framework.

• What wire sizes and installation constraints should I use for safety?

  Use solid or stranded copper wire rated for the operational temperature environment. Secure the terminal block conductor screws to a torque of exactly 0.565 Nm to prevent loose connections or arcing under heavy industrial vibration.