Reliable Power Distribution for CompactLogix Systems
From a maintenance engineer's perspective, the Allen-Bradley 1769-PB2 is a CompactLogix I/O Power Supply designed for dependable 24VDC power distribution in industrial control panels. This module simplifies system layout by energizing up to sixteen CompactLogix I/O modules, reducing wiring complexity and improving serviceability.
Technical Specifications Breakdown
Key parameters for the 1769-PB2 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Input Voltage Range | 19.2-31.2 VDC |
| Current Capacity @ 5V DC | 2.0 A |
| Current Capacity @ 24V DC | 0.8 A |
| Power Consumption | 7.5 W @ 60 °C (140 °F) |
| Inrush Current, Max | 30 A @ 31.2V DC |
| Power Supply Distance Rating | 8 (max 16 modules total) |
| Certifications | c-UL-us; CE; C-Tick |
Industry Applications
This power supply is ideal for medium-scale CompactLogix control systems in manufacturing, packaging, and material handling. Its ability to support eight modules on each side of the supply makes it suitable for distributed I/O banks, reducing the need for additional power supplies and simplifying maintenance access.
Installation & Setup Guidance
Mount the module on a DIN rail or directly to a panel using the provided tabs. Use 14 AWG (2.5 mm²) solid copper wire rated at 90 °C (194 °F) or greater, with insulation max 1.2 mm (3/64 in.). The enclosure is open type, so install the entire assembly inside a protective cabinet. Connect 24VDC input within the 19.2-31.2V DC range. Verify polarity before powering up.
Maintenance & Reliability
Inspect the module periodically for dust accumulation and ensure ambient temperature stays within the operating range. The internal fuse (Littelfuse 02153.15MXP or Wickmann 19195-3.15A) provides overcurrent protection; replace only with the specified type. Check terminal connections for tightness during routine maintenance.
Compatibility & Integration
The 1769-PB2 is part of the Allen-Bradley CompactLogix series and is compatible with Series A and B hardware. It integrates seamlessly with CompactLogix controllers and I/O modules, supporting up to eight modules on either side for a maximum of sixteen total.
Selection Guide & Purchasing Advice
When selecting a power supply for your CompactLogix system, verify your total I/O count and current requirements. The 1769-PB2 delivers 2.0 A @ 5VDC and 0.8 A @ 24VDC, sufficient for many medium-density configurations. Contact SpareTechPLC for lifecycle status and availability before ordering.
Troubleshooting & Common Issues
If the system fails to power up, check the input voltage (19.2-31.2V DC) and inspect the fuse. Verify that the total number of modules does not exceed sixteen. Ensure wiring uses 14 AWG solid copper and connections are secure. For persistent issues, consult the CompactLogix user manual.
