Re: [CAD_CAM_EDM_DRO] Servo Dynamics 1525 servo drive noise

At 12:51 PM 10/7/03 +0000, you wrote:

>I recently purchased an older Milltronics Partner mill. This
>particular unit uses the older Servo Dynamics 1525 servo drives.
>I have tuned the drives to where they perform the way I want them,
>but there is an ear piercing whine or whistling sonund coming from
>the boards.

The older SD and Westamp drives have a low switching frequency of around
5khz. This is in the human audio hearing range. Newer amps switch at 16 khz
or better and are virtually silent.

-Bob