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Allen-Bradley 1756-PA75R/A Redundant AC Power Supply

Product Description

The 1756-PA75R/A is a redundant AC power supply module designed for Allen-Bradley ControlLogix systems. It provides backplane power to the 1756 chassis, ensuring continuous operation in industrial automation applications. This module supports hot-swappable redundancy, allowing for uninterrupted power supply even if one module fails .

Key Features

Redundant Power Design
- Supports dual-module redundancy for high-availability systems .
- Hot-swappable for maintenance without system shutdown .
Wide Input Voltage Range
- 85–265V AC (47–63 Hz), compatible with global power standards .
- Nominal input: 120V/240V AC .
Multiple DC Outputs
- 1.2V DC @ 1.5A
- 3.3V DC @ 4.0A
- 5V DC @ 13.0A
- 24V DC @ 2.8A .
High Reliability & Safety
- Isolation voltage: 2500V AC (enhanced insulation) .
- Built-in non-replaceable fuse for short-circuit protection .
- Hold-up time:
  - 2 cycles @ 85V AC
  - 6 cycles @ 120V AC
  - 20 cycles @ 220V AC .
Compatibility
- Works with 1756-B series & C series chassis (e.g., 1756-A4, A7, A10, A13, A17) .
- IP20-rated for dust protection (requires enclosure for harsh environments) .
Environmental Adaptability
- Operating temperature: -20°C to +60°C (derating above 50°C) .
- Altitude: Up to 2000m without derating .

Technical Specifications

Parameter	Value
Model	1756-PA75R/A
Input Voltage	85–265V AC (47–63 Hz)
Output Power	75W (standard), 140W (peak)
Output Voltages	1.2V, 3.3V, 5V, 24V DC
Mounting	Leftmost slot in 1756 chassis
Dimensions	~120 × 70 × 45 mm (varies by model)
Certifications	SIL 3 (IEC 61508), Category 4/PLe (ISO 13849-1)

Applications

Process Automation (oil & gas, chemical plants) .
Power Generation & Distribution (redundant control systems) .
Manufacturing (automated production lines) .
Critical Infrastructure (water treatment, HVAC) .

Installation & Usage Notes

Positioning
- Must be installed in the leftmost slot of the 1756 chassis .
Wiring
- Use shielded cables to reduce EMI interference .
Redundancy Setup
- Configure via ControlLogix firmware (requires matched power modules)
Maintenance
- Regularly check ventilation and terminal connections .
- Do not replace the fuse (non-serviceable) .