Installation Instructions for Allen Bradley FLEX I/O Power Supply Modules

Quick Guide from the Manual

This document provides installation and wiring instructions for the Allen Bradley FLEX I/O power supply modules. These modules are designed for industrial environments and require specific mounting and wiring procedures to ensure safe operation. Key limitations include a maximum operating temperature of 55°C and specific adapter capacity limits (4 adapters for 1794-PS13/K, 10 adapters for 1794-PS3/K).

Environment and Enclosure

The equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications. It must be mounted within an enclosure that is suitably designed for the specific environmental conditions and provides protection against accessibility to live parts. The enclosure must have flame-retardant properties (5VA rating) and be accessible only by tool.

Preventing Electrostatic Discharge

The equipment is sensitive to electrostatic discharge (ESD). When handling, touch a grounded object to discharge potential static, wear an approved grounding wriststrap, and avoid touching connectors, pins, or circuit components. Store the equipment in static-safe packaging when not in use.

Installation

The power supply module is designed for DIN rail mounting:

• Hook the lip on the rear of the module onto the top of the DIN rail.
• Rotate the module onto the rail.
• Press the module down until it is flush. The locking tab should snap into position.
• If it does not lock, use a screwdriver to move the locking tab down while pressing the module flush.

Wiring

Ensure all wiring complies with applicable electrical installation requirements. Torque terminal screws to 0.8 N·m (7 lb·in). Connect 120/230V AC power to the left-side terminals (A, B, C). Connect 24V DC output to terminals G and H. Terminals I and J are used to daisy chain power to the next adapter in the series.

Diagnostic Indicator

The module features a single power indicator LED:

• ON (green): Output voltage is between 20.4V DC and 28V DC.
• OFF: No power applied, output voltage exceeded 35V DC (overvoltage protection), or output current exceeded the limit (1.4A for 1794-PS13/K; 3.2A for 1794-PS3/K).

Technical Specifications

The modules operate on 120V/230V AC input and provide 24V DC output. The 1794-PS13/K provides 31.2W of power, while the 1794-PS3/K provides 72W. Operating temperature range is 0 to 55°C.