Cisco 4507E with 4200w power supply

[Anonymous user]

I have several closets with dual SmartUPS 3000 power supplies. I am planning to install Cisco Catalyst 4507E chassis using the 4200w power supplies. According to specification for this power supply
(http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps4324/product_data_sheet09186a00801f3dd9...)
To operate with needed amount of power to drive just data services (no POE) the following input is required:
"Two 12A at 100 VAC"
The APC SmartUPS 3000 a 120v UPS rated for "Max Configurable Power 2250 Watts / 3000 VA". The SmartUPS is plugged into utility power via L5-30.

So the max VA the 4500 could drawn is 12 x 100 x 2 = 2400. Which I assume means plugging both AC inputs from the 4200w power supply into a SmartUPS 3000 should not exceed the capacity of the UPS under any power draw condition.

[Anonymous user]

Well I assume if the voltage was higher that would mean the amps needed would be lower. But then again I am guessing at most of this stuff. So I assumed that if it was rated at 12amps at 100v but the supply was actually 120v that the required amps would be lower? I could of course be wildly off on this point.

[BillP]

yeah you are right essentially. as the voltage climbs higher, less amps are required and vice versa. i'd just make sure there isnt a problem with providing the equipment more voltage even though it equals the same amount of VA.

[BillP · Accepted solution]

hi,

your calculations are correct. the only problem is - the output of the Smart UPS is 120v. if the device has a NEMA 5-15 plug, it will be fed 120v. i'd double check on the actual wattage draw of each of the power supplies to get a more accurate measure of what you need. i tried to find it on the page but maybe i missed it.