Universal AC Power for Your ControlLogix System: The Allen-Bradley 1756-PA72
The 1756-PA72 from Allen-Bradley provides versatile AC power for Rockwell Automation’s ControlLogix platform. This robust power supply accepts a wide range of input voltages to deliver stable and clean power. It ensures your entire automation rack operates with maximum reliability and performance in industrial settings.
Key Technical Specifications & Electrical Ratings
- Input Voltage Range: 85-265 V AC, compatible with global power standards
- Input Frequency: 47-63 Hz, accommodating both 50 Hz and 60 Hz systems
- Nominal Input Voltage: 120/240 V AC with maximum input power of 100 VA
- Output Power: 75 W maximum at 0°C to +60°C ambient temperature
- Current Capacity: 10 A at 5.1 V DC, 4 A at 3.3 V DC, 2.8 A at 24 V DC
- Power Dissipation: 25 W with heat output of 85.3 BTU per hour
- Inrush Current: Maximum 20 A peak during startup conditions
- Isolation Rating: 250 V continuous with reinforced insulation protection
Physical Characteristics & Mounting Details
- Dimensions: 14.0 × 11.2 × 14.5 cm (5.51 × 4.41 × 5.71 inches)
- Weight: 0.95 kg (2.10 pounds) for easy handling and installation
- Mounting Position: Exclusive left-side placement in the ControlLogix chassis
- Chassis Compatibility: Works with Series A, B, and C 4-slot to 17-slot chassis
- Enclosure Requirement: Open-type design needs protective industrial enclosure
- Slot Usage: Does not consume any valuable module slots in your system
Performance & Protection Features
- Hold-up Time: 5 cycles at 85 V AC, 6 cycles at higher input voltages
- Overcurrent Protection: Built-in safety with 15 A user-supplied protection
- Dielectric Strength Test: 3500 V DC for 60 seconds between input and backplane
- Operating Temperature: 0°C to +60°C (32°F to 140°F) without derating
- Humidity Tolerance: 5-95% relative humidity without condensation formation
- Vibration Resistance: Withstands 2.0G operational vibration from 10-500 Hz
Packaging & Shipping Information
- Package Contents: One 1756-PA72 power supply module, ready for installation
- Shipping Options: Fast worldwide delivery via FedEx, UPS, and DHL carriers
- Quality Assurance: Comprehensive 12-month warranty against manufacturing defects
Professional Frequently Asked Questions
- Can this power supply handle voltage fluctuations in industrial environments?
- Yes, the wide 85-265 V AC input range provides excellent stability during voltage sags and surges.
- What is the actual power available to my modules after accounting for losses?
- The unit delivers 75W to the backplane while consuming 100W input, resulting in 25W dissipation.
- Does this supply work with both North American and European voltage systems?
- Absolutely, it automatically adapts to 120V and 240V systems without any manual configuration.
- How does the hold-up time protect my system during brief power interruptions?
- It maintains DC power for 5-6 AC cycles after input loss, allowing controllers to save state safely.
- Can I use this power supply in safety-critical applications?
- While reliable, it does not support redundancy; consider redundant systems for critical processes.
Additional Resources & Compatible Products
- Download the complete technical manual for all ControlLogix specifications here: Download ControlLogix Manual
- Pair this power supply with powerful controllers like the 1756-L61 processor
- For safety applications, consider the 1756-L63S GuardLogix controller
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