Product Summary
The Allen-Bradley 1794-PS3 is a robust Flex I/O power supply module. It converts AC line voltage into stable 24V DC power. This unit energizes your Flex I/O adapters and backplane. Engineers trust it for reliable distributed I/O system operation. It handles wide input voltage ranges with ease.
Expert Technical Evaluation & Performance Review
Robust Power Conversion and Electrical Performance
The 1794-PS3 module accepts a universal AC input from 85 to 264V AC. It operates at 47 to 63 Hz frequency. This flexibility allows global deployment without modification. The module delivers a nominal output of 24V DC. It provides a stable voltage range of 20.4 to 27.6V DC. This range includes noise and 5% AC ripple. The output power is a solid 72 Watts.
Its output current rating depends on the mounting orientation. Horizontal mounting allows a maximum of 3 Amperes. All other mounting positions provide 2.8 Amperes. This unit can energize up to ten Flex I/O adapters. It also features a hold-up time for power dips. The output stays within spec for half a cycle. This occurs at 47 Hz and 85V AC input. Such performance ensures system stability during brownouts.
Environmental Ruggedness and Protective Features
The 1794-PS3 withstands harsh industrial environments easily. It operates in temperatures from 0°C to +55°C. The module handles operating shock up to 30 g. It also tolerates vibration of 5g from 10 to 500 Hz. These specs guarantee reliable operation on moving machinery.
Protective circuits are integral to this power supply design. Overcurrent protection kicks in at 3.2 Amperes. Overvoltage protection is set at 35V DC. This shields downstream I/O modules from damage. The unit has a leakage current under 0.5 mA RMS. It also provides 2500V DC isolation between input and output. This isolation protects operators and sensitive electronics.
Thermal Management and Power Dissipation
Effective thermal management is critical for industrial power supplies. The 1794-PS3 dissipates a maximum of 12 Watts of power. Its thermal dissipation equals 41.0 BTU per hour. This low heat output simplifies cabinet cooling requirements. The module measures just 3.7 x 2.7 x 3.4 inches. Its compact open-style enclosure fits tight spaces. It mounts on a standard DIN rail or directly to a panel.
Installation Guide for Maximum Performance
Proper installation ensures the module delivers full rated power. First, verify the AC input voltage matches your supply. Connect the AC input to the designated terminals. Ensure proper isolation between AC and DC circuits. Mount the module horizontally for the maximum 3 Amp output. For vertical or other mounts, expect 2.8 Amps. Apply a minimum load of 50 mA on the output. This guarantees the output voltage stays regulated. The module can handle an inrush current of 40 Amps. This surge lasts for one AC cycle at 265V AC. Your upstream breaker must tolerate this momentary spike.
Logistics & Standard Packaging Details
- One Allen-Bradley 1794-PS3 Power Supply Module
- Product documentation and installation guide
- The unit ships in protective anti-static packaging
- Express delivery shipping is available via FedEx, UPS, and DHL
