The 1756-PA75 is a standard AC power supply module designed for the Allen-Bradley ControlLogix automation platform. It provides regulated DC power to the chassis backplane, ensuring reliable operation for all modules installed within the ControlLogix system.

Features

• 75W total output power capacity
• Wide input voltage range: 85-265V AC (47-63 Hz)
• Supports nominal 120V/240V AC input
• Provides multiple DC outputs: 1.2V, 3.3V, 5.1V, and 24V DC
• Integrated electronic crowbar circuit for over/under voltage and current protection
• Convection cooling design

Applications

• Automotive manufacturing assembly lines
• Oil and gas pipeline control and pump station monitoring
• Food and beverage automated packaging and filling systems
• Water treatment and power generation logic control

Technical Specifications

Installation Guidelines

• The 1756-PA75 must be installed in the dedicated power supply slot located at the far left side of the ControlLogix chassis.
• Ensure the system is powered down before inserting or removing the module to prevent electrical arcing or damage to the backplane connectors.
• The module is designed for convection cooling; ensure adequate clearance above and below the chassis for proper airflow.
• Use a 15A time-delay type fuse in all ungrounded power connections for external overcurrent protection.
• Ensure the module is used in Pollution Level 2 industrial environments and Category II applications as per IEC 60664-1.

FAQ

What is the 1756-PA75?

The 1756-PA75 is a standard AC power supply module for the ControlLogix system, providing regulated DC power to the chassis backplane.

What is the difference between 1756-PA75 and 1756-PB75?

The 1756-PA75 is designed for AC input (85–264V AC), whereas the 1756-PB75 is designed for DC input (18–32V DC).

Does the module require an external fuse?

Yes, it is recommended to use a 15A time-delay type fuse in all ungrounded power connections for external overcurrent protection.

What is the hold-up time during power interruption?

The module provides a hold-up time of 2 cycles at 85V AC (60 Hz), 6 cycles at 120V AC (60 Hz), and 20 cycles at 220V AC (60 Hz).