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
Model
1756-PA75
Input Voltage
85-265V AC (Nominal 120/240V AC)
Input Frequency
47-63 Hz
Max Output Power
75W (at 0 to 60 degC)
Output 1.2V DC
1.5A
Output 3.3V DC
4A
Output 5.1V DC
13A
Output 24V DC
2.8A
Operating Temp
0 to 60 degC (32 to 140 degF)
Storage Temp
-40 to 85 degC (-40 to 185 degF)
Isolation Voltage
250V (continuous)
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).
