Product Overview

The Allen-Bradley 1746-P4 operates as a high-capacity, chassis-mounted power supply module engineered explicitly for the modular SLC 500 PLC platform, including SLC 5/02, 5/03, 5/04, and 5/05 processors. This industrial power unit mounts directly on the left side of standard 1746 racks, delivering regulated 5V DC and 24V DC electrical currents straight to the backplane pathways. It provides the necessary power infrastructure to drive hungry processor tasks alongside dense digital and analog I/O module configurations inside large 7-slot, 10-slot, or 13-slot chassis arrays.

We supply this product exclusively as a 100% Brand New, original factory-sealed unit, guaranteeing pristine electronic circuit boards, unblemished terminal screws, and optimal chemical lifecycle integrity for the internal capacitors.

Technical Specifications

Engineering Advantages

• Power Large-Scale Expansion Racks: Small power modules suffer thermal overload when driving modern electronic cards. The 1746-P4 delivers an expanded 10 Amps of 5V DC current and 2.88 Amps of 24V DC current directly to the backplane, sustaining maximum component density inside 10-slot and 13-slot SLC chassis without requiring external sub-supplies.

• Withstand Severe Voltage Fluctuations: Unstable factory power grids drop and spike unpredictably. This power supply utilizes a robust transformer and input filter network that accommodates wide voltage tolerances (85 to 132V AC or 170 to 265V AC), preventing automated machinery shutdowns during sudden line sags.

• Block High-Voltage Electrical Surges: Industrial environments introduce massive noise via inductive motors and switching gear. The 1746-P4 implements a stringent 2600V DC dielectric isolation barrier for 1 second between the primary AC line terminals and the internal DC backplane, keeping high-voltage spikes away from your core CPU memory.

• Simplify Live Diagnostics: The front faceplate displays a clear, green "Power OK" LED indicator. This physical diagnostic tool provides immediate visual verification of backplane voltage status, allowing maintenance technicians to separate incoming electrical source failures from downstream processing faults instantly.

FAQs

• Can I replace a lower-capacity 1746-P1 or 1746-P2 supply with this 1746-P4 module?

  Yes. The 1746-P4 offers higher current capacities than the 1746-P1 and 1746-P2 models while maintaining the identical physical footprint and chassis attachment system on the left side of the SLC rack. It provides an ideal upgrade path when adding high-density or analog modules to an existing system.

• How should I handle an internal fuse failure on the 1746-P4?

  The 1746-P4 features an internal safety fuse soldered directly onto the main power circuit board to prevent fire hazards during catastrophic electrical faults. Because the factory seals this non-replaceable fuse in place, an open fuse typically indicates internal component degradation, requiring a complete module swap to resume safe, reliable operation.

• Does this power supply require manual jumper configuration for 120V versus 240V AC inputs?

  No. The advanced power regulation circuitry inside the 1746-P4 automatically selects and accommodates the correct incoming line voltage level within the specified 85-132V AC or 170-265V AC operating bands. Always verify your input terminal wiring layout matches the official manual before energizing the module.