I have a 6509 chassis w/1 Sup720 and dual 3000W power supplies. When I power it on it runs for about 3-5 minutes and the power supplies shutdown. The red "Output Failure" light comes on. They are connected to 110V/20Amp circuits. These are the same circuits that were used with a previous set of power supplies (lower wattage). I removed everything from the chassis except for the fan tray and the sup module to reduce the power demand. Same result. Thoughts?
I'm pretty sure its the fan tray, once I faced the same problem of running the Sup720 in a plain Cisco 6509 during testing, power wise is sufficient but it shutdown in 5-10 minutes times, after an upgraded fantray it powered up and never shut down till the testing done
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