Allen-Bradley 1746-P4 SLC 500 Power Supply, 120-220VAC

Product Summary

The 1746-P4 is a robust SLC 500 power supply from Rockwell Automation. This module delivers reliable backplane power to your local or remote chassis. It accepts a wide input voltage range of 85 to 250VAC. The unit provides a 24VDC output for powering external devices. Its built-in fuse protection safeguards your entire control system.

Product Procurement & Buyer Guide

The 1746-P4 solves critical power distribution challenges in industrial settings. This module eliminates the need for separate power supplies for your SLC 500 chassis. It directly powers all connected I/O and processor modules. This simplifies system design and reduces overall wiring complexity. Engineers appreciate its dual-voltage input capability for global use.

Procurement managers value the unit's high internal current capacity. It delivers 10.0 A at 5V dc to the backplane. This supports dense chassis configurations with many modules. The 24VDC output provides 2.88 A for auxiliary devices. This feature can power sensors or small actuators directly.

The hold-up time is a key operational advantage for this power supply. At full load, the unit maintains processor logic for 20 milliseconds. This brief window allows the system to handle minor power dips. At no load, the hold-up time extends to 3000 milliseconds. This feature prevents unexpected shutdowns during momentary voltage sags.

This power supply meets strict safety and environmental certifications. It holds UL Listing as Industrial Control Equipment. The unit is also CSA Certified for hazardous locations. This makes it suitable for Class 1, Div 2 environments. Engineers can deploy it in demanding industrial applications with confidence.

The module operates reliably within a temperature range of 0 to 60 Celsius. This tolerance suits most factory floor environments. Its compact dimensions of 5.5 x 4.3 x 5.7 inches fit standard 1746 chassis. The unit weighs only 2.5 pounds for easy handling. These specs make it a straightforward replacement or upgrade choice.

Installation & Deployment Guide

Mount the 1746-P4 directly into the leftmost slot of your SLC 500 chassis. Ensure the chassis power is completely disconnected before installation. Slide the module firmly into the guide rails until it seats. Secure the unit using the top and bottom mounting screws. Verify the module locks into place without any gaps.

Connect the AC input power to the designated terminal block. The unit accepts 120 to 220 Volts AC at 47 to 63 Hertz. Use the correct wire gauge for your specific installation. The typical line power requirement is 180VA. Ensure your circuit breaker can handle the 45 Amp inrush current.

Do not use the 24VDC output to power output modules directly. This practice complicates troubleshooting for individual modules. You would need to shut down the entire SLC 500 rack. Instead, use this output for isolated sensors or indicators. This keeps your main control system easily serviceable.

The power supply provides backplane current of 10 Amps at 5 Volts. It also delivers 0.46 Amps at 24 Volts to the backplane. Verify your total chassis load does not exceed these limits. Use the fuse protection with a 1746-F1 or equivalent fuse. This protects your investment from overcurrent damage.

Always verify the input voltage matches your local supply before powering up. The module requires 85 to 132VAC or 170 to 250VAC. Check for proper grounding to ensure operator safety. The unit will begin providing backplane power immediately. Your connected modules will then become operational and recognized.