Product Summary
The Allen-Bradley 1794-PS3 provides reliable backplane power for your Flex I/O system. This module converts a wide-range AC input into a stable 24VDC output. Engineers trust this unit for its robust performance and protective features in demanding industrial environments.
Expert Procurement & Installation Guide
Power Specifications for Buyers
The 1794-PS3 solves critical power distribution challenges for distributed I/O. It accepts a universal input from 85 to 264VAC. This flexibility simplifies global inventory management for your plant. The unit delivers a nominal output of 24VDC. You get a full 72 Watts of power for your modules. The output voltage stays within a range of 20.4 to 27.6VDC. This includes noise and 5% AC ripple components. This stable power ensures your I/O modules operate correctly.
System Load Capacity and Protection
This module easily energizes up to ten Flex I/O adapters. Its output surge capability handles adapter inrush currents. The unit features an overcurrent protection set at 3.2 Amperes. This protection prevents damage from downstream faults. The module also provides overvoltage protection at 35VDC. This safeguards your connected equipment from supply rail failures. Engineers value this comprehensive protection for system reliability.
Mechanical Mounting and Installation
Installing this power supply requires careful orientation planning. The unit delivers a maximum output current of 3 Amperes when mounted horizontally. All other mounting orientations reduce this value to 2.8 Amperes. You can mount the module on a DIN rail or directly on a panel. Its open-style enclosure allows for efficient heat dissipation. The compact dimensions measure just 3.7 x 2.7 x 3.4 inches. This small footprint saves valuable space inside the control cabinet.
Wiring and Electrical Requirements
You must maintain isolation between the AC input and DC output terminals. The module provides an isolation voltage rating of 2500VDC. This high isolation prevents ground loops and noise issues. The unit requires a minimum load of just 50mA for proper regulation. Its maximum leakage current is only 0.5 mA RMS. This low leakage enhances safety in sensitive installations. The module withstands a typical inrush current of 40 Amperes. This occurs for one AC cycle at 265VAC input and 55°C.
Environmental and Operational Tolerances
This power supply operates reliably in harsh factory conditions. Its operating temperature range spans from 0°C to +55°C. The unit handles operating shocks up to 30g. It also withstands vibrations of 5g at 10-500 Hz. The thermal dissipation reaches only 41.0 BTU per hour. This low heat output simplifies panel cooling requirements. The maximum power dissipation is just 12 Watts. This efficiency keeps your control cabinet running cooler.
Hold-Up Time and Power Integrity
The 1794-PS3 includes a valuable power hold-up time feature. The output stays within specification for half a cycle. This occurs at 47 Hz, 85VAC input, and maximum load. This hold-up time protects against brief power sags. Your I/O modules continue normal operation during minor disturbances. This feature is critical for maintaining process continuity. It prevents nuisance faults from momentary line dips.
