Case Study: Rescuing a Stalled CompactLogix Expansion
A system integrator faced a critical deadline: their CompactLogix line needed to add twelve I/O modules, but the existing power supply couldn’t handle the load. The fix was the Allen-Bradley 1769-PB2, a robust I/O power supply that energizes up to sixteen modules. This module solved the problem by providing dedicated power to both sides of the rack, eliminating voltage drops and ensuring reliable operation.
What Is the 1769-PB2?
The 1769-PB2 is a CompactLogix I/O power supply from Allen-Bradley. It accepts a wide input voltage range of 19.2-31.2V DC and delivers 2.0 A at 5V DC and 0.8 A at 24V DC. With a power supply distance rating of 8, it can power eight I/O modules on each side, totaling sixteen. Its compact dimensions (118 x 70 x 87 mm) and lightweight design (485 g) make it ideal for space-constrained panels.
Key Technical Specifications
- Input Voltage: 19.2-31.2V DC
- Output Current: 2.0 A @ 5V DC, 0.8 A @ 24V DC
- Max Inrush Current: 30 A @ 31.2V DC
- Power Consumption: 7.5 W @ 60 °C
- Fuse Type: Littelfuse 02153.15MXP; Wickmann 19195-3.15A
- Wire Size: 14 AWG solid copper, 90 °C insulation
- Certifications: c-UL-us, CE, C-Tick
Why the 1769-PB2 Is a Smart Upgrade
Upgrading to the 1769-PB2 offers immediate ROI by preventing costly downtime. Its wide input range tolerates voltage fluctuations, reducing the risk of unexpected shutdowns. The module’s ability to power sixteen modules means fewer power supplies are needed, saving panel space and wiring costs. Additionally, the built-in fuse protects against overcurrent events, extending the life of connected I/O modules.
Installation and Setup
Mount the 1769-PB2 directly on a panel or DIN rail within an enclosure that meets the environmental rating. Use 14 AWG solid copper wire rated for 90 °C or higher. Connect the input power to the designated terminals, ensuring correct polarity. The module features finger-safe covers and clear terminal identification for safe wiring. Always follow local electrical codes and the manufacturer’s guidelines.
Maintenance and Reliability
Periodic inspection of the fuse and connections is recommended. Check for signs of overheating or loose wires. The 1769-PB2 operates in temperatures from 32 to 140 °F and withstands vibration of 5 G at 10 to 500 Hz. Its robust design ensures long-term reliability, but always verify lifecycle status and availability with SpareTechPLC before ordering.
Compatibility and Integration
The 1769-PB2 integrates seamlessly with CompactLogix controllers and I/O modules. It supports the CompactLogix platform’s mounting methods and communicates via the backplane. No additional configuration is required; it automatically provides power to connected modules.
Selection Guide
Before purchasing, confirm your input voltage and required current capacity. Ensure your application does not exceed the 16-module limit. For assistance, contact SpareTechPLC, a trusted supplier of industrial automation parts.
Frequently Asked Questions
Q: What is the maximum number of modules the 1769-PB2 can power?
A: It can power up to 16 modules, with 8 on each side.
Q: What fuse does the 1769-PB2 use?
A: It uses Littelfuse 02153.15MXP or Wickmann 19195-3.15A.
Q: Can the 1769-PB2 be mounted on a DIN rail?
A: Yes, it supports both panel and DIN rail mounting.
Q: What is the input voltage range?
A: 19.2-31.2V DC.
Q: Is the 1769-PB2 certified for industrial use?
A: Yes, it holds c-UL-us, CE, and C-Tick certifications.
