AP7723...Dead?

[Anonymous user]

I purchased 2 APC AP7723 Automatic Transfer Switches secondhand locally. I had the intention of testing them and then integrating them into a rack of test servers. They did not come with cables, so I purchased 4 (2 each) :

NEMA 5-20P to C19 Power Cord, 8 Foot - 20A/125V, 12/3 SJT

and 10 female to male 3 prong standard computer power cables. Both of the ATS power cables are connected to a standard 120V wall socket on 2 different circuits. When I plugged in the ATS, I can hear a hum and feel a slight vibration but there are no lights and the buttons are non responsive. I connected a monitor to one the the output plugs and it would not turn on. I also connected a CAT5 to it and to a live switch and saw no light on the network connector. 

Am I missing something here? Does this need a particular type of circuit/voltage? I honestly don't know too much about electricity, so I don't know if I am overlooking something simple. Or is it possible that I got hosed and bought 2 dead units (there were not expensive at all, I paid less than $50 for both of them). 

Please let me know anything I may be missed to try out. 

Thanks!!!

[Terry_Kennedy_apc]

The AP7723 is a 208/230V device. The 120V you're applying won't be enough to allow the internal power supplies to provide the 24V DC that the controllers in the unit depend on.

You'll either need to run these on 208/230V or use them as paperweights, I'm afraid.

[Anonymous user]

Hey would you look at that...it says right on the device that it is 208v...I cant test yet since even though we have some 208/230 circuits in the building, they have a different type of plug (round). So until then I cant yet test them, not to mention that we would have to run a new circuit to the server room. I will keep you posted.

[Terry_Kennedy_apc · Accepted solution]

Bear in mind that IEC connectors are not keyed to prevent voltage mismatches between devices. The non-locking and locking NEMA connectors normally prevent voltage mismatches.

Not all equipment with an IEC input connector will auto-sense 120V vs. higher voltages - some equipment has a selector switch, and some equipment is single-voltage only. Thus, it is a lot easier to let the "magic smoke" out when using IEC style devices like the AP7723.