Product Overview
The Allen-Bradley 1769-PA2 is a CompactLogix I/O power supply from Rockwell Automation. It delivers reliable AC-to-DC conversion for powering 1769 I/O modules in a CompactLogix assembly or expansion bank. This unit provides 2.0A at 5VDC and 0.8A at 24VDC, supporting up to eight modules on each side for a maximum of 16 modules total. Its open-style design makes it suitable for panel mounting in industrial environments.
Technical Specifications Breakdown
Key parameters for the 1769-PA2 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Part Number | 1769-PA2 |
| Product Type | I/O Power Supply |
| Input Voltage Range | 85…265V AC |
| Input Frequency Range | 47…63 Hz |
| Current Capacity @ 5V DC | 2.0 A |
| Current Capacity @ 24V DC | 0.8 A |
| Power Consumption | 100VA @ 120V AC; 130VA @ 240V AC |
| Power Dissipation | 8 W @ 60 °C (140 °F) |
| Enclosure Type Rating | None (Open Style) |
| Weight | 525 g (1.16 lb) |
| Dimensions (HxWxD) | 118 x 70 x 87 mm (4.65 x 2.76 x 3.43 in.) |
| Certifications | c-UL-us; CE; C-Tick |
Industry Applications
This power supply is ideal for discrete manufacturing and process control systems where CompactLogix controllers manage multiple I/O points. For example, in a packaging line, the 1769-PA2 can power digital and analog input modules that monitor sensors and actuators. Its 85-265VAC input range allows global deployment without voltage conversion. By supporting up to 16 modules, it reduces the need for additional power supplies, lowering total cost of ownership.
Installation & Setup Guidance
Mount the 1769-PA2 on a DIN rail or directly to a panel. Use 14 AWG solid copper wire rated for 90°C for the input connection, keeping leads short to minimize voltage drop. The module requires grounding per local codes. Ensure adequate ventilation around the unit; avoid exposure to static, UV radiation, or debris. For ambient temperatures above 60°C, consider forced air cooling. The internal fuse (Littelfuse 02153.15MXP or Wickmann 19195-3.15A) protects against short circuits and transients.
Maintenance & Reliability
Inspect the power supply periodically for dust accumulation and signs of overheating. Clean with dry compressed air only. The open-style enclosure means the unit must be housed in a protective cabinet if used in corrosive or dusty environments. Check input voltage and output currents against rated values during routine maintenance. The module is designed for long service life with minimal intervention.
Compatibility & Integration
The 1769-PA2 integrates seamlessly with any CompactLogix controller and 1769 I/O modules. It can be placed at the left end of a local rack or in an expansion bank. The distance rating of 8 modules per side ensures reliable power distribution. Use only 1769-series modules to maintain compatibility.
Selection Guide & Purchasing Advice
When selecting a power supply for your CompactLogix system, consider the total current draw of your I/O modules. The 1769-PA2 provides 2.0A at 5VDC and 0.8A at 24VDC, sufficient for most mixed I/O configurations. For higher current needs, consider the 1769-PA4 or 1769-PB4. SpareTechPLC stocks this unit and can advise on lifecycle status and availability. Please verify current lifecycle status before ordering.
Troubleshooting & Common Issues
If the power supply fails to power up, check the input voltage (85-265VAC) and frequency (47-63 Hz). Verify the internal fuse is intact. If the output voltage is low, measure the load current; exceeding 2.0A at 5VDC or 0.8A at 24VDC may cause the unit to shut down. Ensure the module is properly grounded. For persistent issues, consult the Rockwell Automation documentation or contact SpareTechPLC support.
