Re: [CAD_CAM_EDM_DRO] Re: Transformer Soft Start

Hi Rab,

The thermistor needs to go on the supply side of the transformer.
Transformers can pull huge instantaneous currents if you happen to switch
them at the peak of the mains cycle.

Les

> Thanks Les,
>
> We've accounts with both RS and Farnell and usually find Farnell
> cheaper.
> I've got one large transformer supplying 5 steppers which gives quite
> a thump when it's switched on.
> Is it better to put the resistance on the supply side of the
> transformer or between the transformer and the capacitor which is
> drawing the current surge ?
>
> thanks for the codes,
>
> Rab
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Les Newell" <les@l...> wrote:
> > Hi Rab,
> > RS order code 210-724 or 210-730 should work fine.
> >
> > I normally use Farnell order code 984-450 because it is cheaper.
> > http://uk1.farnell.com/Welcome/welcome-frame-unregistered.jhtml
> >
> >
> > HTH,
> > Les
>