Attachment 0004 - TANO ECN POWER SUPPLY.pdf

This document is an Engineering Change Notice (ECN) from L-3 Technologies detailing a power supply modification for an existing system. The ECN replaces obsolete ERC SOLA CVDC power supplies with new Phoenix Quint-PS/1AC/24DC/40 power supplies, specifically replacing the old 28-2127-1, 25 AMP model with a new 2866789 rated 40 AMP power supply. The modification involves removing six existing power supplies and installing new ones, with accompanying wall mounting brackets (part number UWA 130-2901664) and detailed instructions for removal, testing, and installation.

The material sheet accompanying the ECN lists multiple components required for the modification, including 8 power supplies, 10 power supply brackets, various screws, washers, terminal blocks, and wiring (gray, red, black, blue, and green wires in different gauges). The components are sourced from vendors like Phoenix, Grainger, Newark, with quantities ranging from 2 to 500 feet of materials. The documentation provides comprehensive step-by-step guidance for technicians, including initial testing procedures, wire connection instructions, and voltage verification steps to ensure proper installation and functionality of the new power supply system.