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

Mariss, what do you think? If/when you offer this drive, will it
offer adequate isolation for this application? I know
transformers aren't too expensive, but if it will be a 1:1
transformer, I'd prefer to skip it.

Carlos

> 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