Description

The Allen-Bradley 1746-P2 is a modular system power supply unit in the SLC 500 product family. It provides regulated DC operating power directly across the 1746 chassis backplane to support SLC 500 processor units and I/O expansion modules. Operating on a wide AC line voltage range of 85–132V AC or 170–265V AC at 47–63 Hz, the module delivers an internal current capacity of 5A at 5V DC and 0.96A at 24V DC. The unit also includes an integrated 24V DC user power supply output capable of supplying up to 200 mA to external field devices.

Features

• Delivers an internal backplane current capacity of 5A at 5V DC and 0.96A at 24V DC.
• Features selectable AC line voltage operation for 85–132V AC and 170–265V AC at 47–63 Hz.
• Includes an auxiliary 24V DC user power supply output rated for 200 mA across an 18–30V DC voltage range.
• Provides 1800V AC RMS isolation for 1 second between input terminals and the chassis backplane.
• Includes built-in overcurrent protection using a 1746-F2 or equivalent fuse (250V-3A, SANO SOC SD4, or BUSSMAN AGC 3).
• Supports CPU hold-up time of 20 ms at full load and up to 3000 ms under no-load conditions.

Applications

• SLC 500 modular chassis backplane power delivery.
• Factory automation, control rack assemblies, and industrial processing machinery.
• Auxiliary power supply source for external 24V DC field sensors and transducers.

Technical Specifications

Installation Guidelines

• Mounting: Mount the module directly into the left-most slot (Slot 0 position) of a 1746 SLC 500 modular chassis.
• Overcurrent Protection: Install time-delay type overcurrent protection (up to 15A maximum) in all ungrounded AC input conductors.
• Isolation & Grounding: Maintain 1800V AC RMS isolation integrity between external power input connections and the chassis backplane by using proper grounding practices.
• Temperature Derating: Ensure adequate enclosure ventilation and apply a 5% current capacity derating when operating in ambient temperatures above +55 degC.

Compliance and Certifications

• UL Listed: Industrial Control Equipment for Class 1, Division 2, Groups A, B, C, D Hazardous Locations
• CSA Certified: Process Control Equipment for Class 1, Div 2, Groups A, B, C, D Hazardous Locations
• CE Directive: European Union 89/336/EEC EMC Directive (EN 50082-2 Industrial Immunity, EN 50081-2 Industrial Emissions) and 73/23/EEC LVD Directive (EN 61131-2 Programmable Controllers)
• C-Tick: Australian Radiocommunications Act compliant with AS/NZS 2064 Industrial Emissions