Hello!
How would you normally drive a 220v servo in the USA?
240v is absolute max on the servo so 2x120v would not be adviced and most transformers seem to be 120 to 240v.
Is there also 120 to 220v transformer? link?
Whats the normal voltage in the US, is it 120v?
Thanks.
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Last edited by jeeybee; 08-24-2020 at 05:56 AM.
Mactec54
You never size the power supply to the exact plate voltage of the servo, any overcurrent or other limits are taken care of by the drive.
IOW, there is a controller between the motor and supply.
As a rule it is over-current that can damage a motor not over voltage, within reason.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Ok, on the drive it says 220v -15% +10%
So max for the drive should be 242v and according to wikipedia the US can have a fluctuation of the voltage of about 6% which would be max 254.4v.
If it was only for me I would have tried it but as I´m sending it from Sweden to a customer in the US I´m a bit more careful
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Ok thanks, its hard to make long term stress tests though.
The other way to protect yourself is to offer a max Voltage, say it is 220v / 230v and the end user would have to use a Buck Transformer so it did not go above your max voltage Buck Transformers are not expensive for low amp application's
Buck / Boost Transformers are use when doing small changes in voltage supply: 5%, 6.6%, 10%, 13.3%, 20%, and 26.6%
Mactec54
Typically the 1 phase voltage in N.A. is now 120/240v
Rarely seen is 220v 3ph, 208 3ph is more common.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
I've spent several decades developing PSUs and VFDs and we always designed for 240 +10% ie 264V. The +10% is required (by UL, CSA etc) on top of the declared sticker voltage. And you wouldn't expect it to blow up at 265V - there are voltage transients to design for, caused by the effects of lightning strikes, fuse blowing spikes etc, which require some additional design margin above 264V.
The supply here in the UK is typically 240-250V these days and it doesn't cause a problem. I lived in Canada for 5 years and my UK stuff was fine on the 240V there. You shouldn't have a issue.