Complete Guide to Allen Bradley 1756 ControlLogix Power Supplies

Selecting proper power supplies ensures reliable industrial automation performance. Allen Bradley’s 1756 ControlLogix series offers multiple power solutions. This guide helps engineers choose the right power modules for their control systems.

Standard AC Power Supply Specifications

Standard AC models convert facility power to backplane voltages. They handle input ranges from 85-265V AC efficiently. Six models provide different capacity options. Furthermore, they support 47-63 Hz input frequencies reliably.

DC Power Supply Options

DC power supplies suit various industrial voltage systems. Eight models accommodate different DC input ranges. Some models support 18-32V DC inputs. Moreover, specialized units handle 90-143V DC systems.

Current Capacity Requirements

Power supplies deliver multiple voltage levels simultaneously. All models provide 1.2V, 3.3V, 5V and 24V outputs. Higher capacity units support more power-hungry modules. Consequently, proper sizing prevents system overloads.

XT Series for Extreme Environments

ControlLogix-XT models operate in harsh temperature conditions. They function from -25°C to 70°C temperature ranges. This exceeds standard models’ 0°C to 60°C limits. However, they provide slightly reduced output power.

Redundant Power System Benefits

Redundant power supplies ensure maximum system availability. They operate in pairs with automatic load sharing. Diagnostic features monitor operational status continuously. Additionally, they provide annunciator power for status signaling.

Industrial Power Supply Market

The industrial power supply market shows steady growth. According to MarketsandMarkets, it will reach $15.2 billion by 2027. Reliability requirements drive specialized product development. Factory automation represents the largest application segment.

Key Technical Specifications

• Input voltage ranges: 85-265V AC or 18-143V DC
• Output voltages: 1.2V, 3.3V, 5V, 24V DC
• Power capacity: 42W to 75W depending on model
• Operating temperatures: -25°C to 70°C
• Holdup time: 2-20 cycles or 20-50ms
• Physical dimensions: Vary by capacity and type

Control System Integration

Power supplies integrate with 1756 ControlLogix chassis seamlessly. They mount on the left side of all series A, B and C chassis. Proper installation ensures stable backplane power. Therefore, control modules operate reliably in demanding environments.

Oil and Gas Application Case

A remote pumping station requires extreme reliability. Temperatures range from -20°C to 45°C annually. The XT redundant power supply provides optimal solution. It ensures continuous operation despite environmental challenges.

Expert Analysis from World of PLC

At World of PLC, we’ve installed numerous ControlLogix power systems. Many engineers underestimate holdup time importance. Proper industrial automation power design requires understanding both specifications and environment. We recommend redundant systems for critical processes. Regular maintenance prevents unexpected power failures. Documentation ensures proper replacement procedures.

Selection Recommendations

• Calculate total module power requirements accurately
• Consider environmental temperature variations
• Evaluate system criticality for redundancy needs
• Verify input voltage compatibility
• Check physical dimensions for chassis fit
• Review maintenance and replacement procedures

Frequently Asked Questions

• How do I calculate total power requirements for my chassis?
• Sum the maximum power consumption of all installed modules and add 20% safety margin for future expansion and reliable operation.
• What’s the practical difference between standard and XT series?
• XT series maintain reliable operation in temperature extremes where standard units might fail, making them essential for outdoor or harsh environments.
• Can I mix different power supply models in the same system?
• While technically possible with proper configuration, we recommend using identical models for consistent performance and simplified maintenance.