Overview
The Allen-Bradley 1794-PS3 is a Flex I/O power supply module designed to convert 120/230VAC input to regulated 24VDC output. This unit is part of Rockwell Automation’s Flex I/O product family, a distributed I/O solution for industrial automation control systems. The module is mainly used to provide power to a Flex I/O assembly, providing the necessary backplane power to operate the installed modules. As a used unit, it offers a cost-effective solution for replacement or expansion of existing systems.
Key Features
- Output current capable of supplying power up to 10 Flex I/O adapters
- Open-style, DIN rail-mounted enclosure for standard panel installation
- Supply voltage range of 85-264VAC, 47-63Hz with nominal supplies of 120V AC, 50/60 Hz; 1.7 A max. and 230V AC, 50/60 Hz; 1.1 A max.
- Nominal output voltage of 24VDC with voltage range of 20.4–27.6V DC, including noise and 5% AC ripple
- Power supply hold-up time where output will stay within specification when input drops out for 1/2 cycle @ 47 Hz, 85V AC with maximum load
- Standard industrial certifications: UL, CE, GOST, C-TICK, KC, Marine rated
Technical Specifications
- Maximum input current 1.9 Amps, minimum load 50 mA, output power 72 W, and output ripple maximum of +/-5% 1200mV peak-to-peak
- Leakage current maximum of 0.5 mA RMS at rated input and output, and overcurrent protection up to 3.2 Amps
- Power dissipation 12 W, thermal dissipation 41 BTU/hour
- Able to withstand an inrush current of 40 A typical, 1 AC cycle @ Vin 265V AC, 55 °C
Typical Applications
The 1794-PS3 is used in distributed I/O control systems across industries including:
- Machine automation and process control
- Factory automation systems with remote I/O requirements
- Manufacturing equipment retrofits and system expansions
- Industrial control cabinets requiring modular power distribution
- Legacy system maintenance and module replacement
Compatibility & Replacements
Compatible With
- Flex I/O adapter modules (up to 10 adapters per supply)
- Allen-Bradley CompactLogix and ControlLogix systems via Flex I/O networks
- EtherNet/IP distributed I/O architectures
- Standard 35mm DIN rail mounting
- Screw-type terminal connections (22–12 AWG stranded copper)
Replaces / Drop-In Replacement For
- OEM part number 1794-PS3 (all revisions)
- Verify compatibility with your system integrator before ordering alternative power supplies
Works With
- RSLogix 5000 / Studio 5000 (Flex I/O configuration and monitoring)
- EtherNet/IP protocol for distributed I/O communication
- Allen-Bradley PowerFlex drives and motor control systems
- Standard industrial automation software and SCADA platforms supporting Flex I/O
