Procure now the 1794-PS3, the high-capacity power solution for Allen-Bradley FLEX I/O systems. Delivering a full 3.0 Amps of regulated 24V DC power, this module is designed for complex, high-density I/O configurations that demand more current than standard supplies can provide.
What Is the 1794-PS3?
The 1794-PS3 is a robust 3A power supply module within the FLEX I/O family. It is engineered to provide reliable 24V DC power to both the FLEX I/O communication adapters and the field-side circuits of various I/O modules. In systems utilizing high-current digital outputs or multiple analog modules, the 1794-PS3 is essential to prevent voltage drops that can lead to communication errors or sensor inaccuracy. Its compact DIN-rail mount design allows it to integrate perfectly into the modular FLEX I/O architecture, providing a centralized power point for an entire distributed I/O station.
Key Technical Specifications
- Input Voltage: 85V AC to 264V AC
- Output Voltage: 24V DC
- Output Current: 3.0 Amps
- Power Dissipation: 11W maximum
- Inrush Current: 40A for 2ms
- Output Ripple: 200mV peak-to-peak
- Thermal Protection: Internal shutdown for overtemperature
- Certifications: UL, CSA, CE
Architecture and System Reliability
In a typical FLEX I/O architecture, the 1794-PS3 is placed at the head of the DIN rail to provide power to the communication adapter (EtherNet, ControlNet, etc.). The module features an LED indicator on the front panel to provide immediate visual confirmation of DC power status. This supply is particularly favored in automotive and heavy manufacturing lines where multiple high-density 32-point modules (like the 1794-IB32) are used, as these configurations can easily exceed the capacity of smaller 1.3A supplies.
Expert Tips
For systems operating in high-temperature environments, ensure there is at least 2 inches (50mm) of clearance above and below the 1794-PS3 for convection cooling. If you are experiencing unexplained module resets, check the total current load; even if you are under 3A, high inrush current from field sensors during startup can cause a temporary dip. Using a 1794-PS3 instead of multiple smaller supplies can simplify your cabinet’s grounding scheme and reduce points of failure.
Frequently Asked Questions
Q: Can I use the 1794-PS3 to power non-Allen-Bradley devices?
A: While its primary design is for FLEX I/O, it is a standard 24V DC power supply and can technically power other 24V industrial components as long as their total draw does not exceed 3A.
Q: Does the module have a fuse?
A: Yes, it has internal overcurrent protection that will shut down the output in a short-circuit condition. The module will typically reset once the fault is cleared and power is cycled.
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