Description
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).
