Hey Greg,
but you don’t need to switch the Elite power supply box to 220 V to run a 220 V spindle, you know that? As Onefinity did not forget to emphasize, the “router” relay is only for a router! A spindle, that is forcibly driven by a VFD, MUST NOT be switched on or off by interrupting the power to the VFD! Neither the VFD supply input, nor the VFD to spindle connection is allowed to be interrupted by a switch or relay while the spindle runs! It may destroy both the spindle and the VFD. The only way to stop and start a spindle is with the VFD’s RUN and STOP commands. These can either be given on the VFDs front keyboard, or by g-code commands by the CNC controller.
I know that you probably already know all this, because you explained that your reason to go to 220 V for the Elite Controller is the UPS you can get (6 kW, really cool by the way). But I always write for all who might find this with the search function in the future, with their case being slightly different 