Proliant DL180 G6 power supply voltage 220V or 110V

[ehuang]

Hi there,

I want to make sure if it is correct that DL180 G6 server should be plugged in a 220 Volts power supply instead of a 110 Volts? From time to time, I receive alerts saying "Power redundancy has lost" while the server is up and running. I saw somebody having this kind of problem on another model but it was fixed by switching to 220V. I am wondering if it is the same case. 

Thank you,

Eagle