# Safe to switch US Elite to 220v?

**URL:** <https://forum.onefinitycnc.com/t/safe-to-switch-us-elite-to-220v/24166>\
**Category:** Elite Series (Masso & Redline) (Gen 1)\
**Created:** [December 22, 2023, 7:04am UTC](https://forum.onefinitycnc.com/t/safe-to-switch-us-elite-to-220v/24166 "2023-12-22T07:04:00Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [December 22, 2023, 3:15pm UTC](https://forum.onefinitycnc.com/t/safe-to-switch-us-elite-to-220v/24166/3 "2023-12-22T15:15:55Z")

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Hey Greg,

What I want to know is if I can switch the power supply in the Elite to 220v.  
[/quote]

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.

> [@VFD Line (input) Power Control](https://forum.onefinitycnc.com/t/vfd-line-input-power-control/21328/2):
>
> According to the updated IEC 60204-1, a VFD’s spindle STOP command is considered as a valid Safe Torque Off (STO) that fulfils the stop category 0 requirement.

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](https://en.wikipedia.org/wiki/Uninterruptible_power_supply) 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 😉

#### Further reading

- [About emergency stop modes](https://forum.onefinitycnc.com/t/spindle-z-slider-dropping-spindle-drop-down-on-poweroff-estop-elite-series/19878/39)

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