
Originally Posted by
joeavaerage
Hi,
I have been suppling and fitting Delta servo is NZ for about ten years now, and five 750W servos fitted to my machine. There is not a transformer on any of them,
and over that time zero failures. If DMM or whatever other manufacturer cannot design their products to tolerate local supply conditions that is a black mark against that manufacturer.
Years ago being able to design for and provide a measure of voltage tolerance was difficult as the semiconductors themselves were very expensive. Today 650V MOSFETS are dime a dozen,
and if you want extra certainty then use SiC MOSFETS. There is absolutely no excuse for any servo manufacturer having products that are sensitive to overvoltage.
Craig