I want to know the need minimum ampere of vsp7254 xsq 460W(220V)
that information will likely be in the platform install guide.
Follow this link https://www.extremenetworks.com/support/documentation/vsp-operating-system-software-voss-document-co...
and download the document collection for the 7200 for v184.108.40.206. Within that folder will be the install guide that should have all the environmental and power specs.