Re: [CAD_CAM_EDM_DRO] Gecko 160-180V servo drivers

Carlos Guillermo wrote:

> Hmmm... 160-180 VDC input? I'd be real tempted to take full-bridge
> rectified and filtered 120VAC (120 x 1.41 = 169.2) and skip the
> expensive transformer. I know this can be dangerous being
> non-isolated from the mains, but can this be done safely with
> proper implementation?

It depends entirely on what circuitry is in the drive control. If it
was designed
from the ground up for complete isolation, then it is merely dangerous.
If it was not designed for it, you will have to isolate EVERY signal
from
the servo amp to anything else, such as the encoder, commands from the
computer, fault signals to the computer, etc. The transformers are NOT
that expensive! They are laying all over the place - these are called
'control transformers' or 'step-down' transformers, and are used all
over the
place in industrial plants to convert 440 V to 240 V, or 240 V to 110 V
to run solenoids, light bulbs, annunciator panels and all sorts of
control
gear off the main feed to machine tools, air conditioners, blowers, etc.

They have terminals labeled H1 to H4 and X1 to X4, generally, and are
rated in KVA.

Jon