Re: Gecko burned out

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp" <jeff@w...> wrote:
>
> Whoa, slow down! If I remember right the Gecko is rated a 8 Amps
> max. Because of this the connectors are sized accordingly. The
fact
> that a PS can put out higher amperage doesn't mean the the drive
will
> pull over 8 Amps. Therefore the wire doesn't have to be any
larger
> than #18. If you start trying to put two pounds into a one pound
> package, you're looking for a headache. Change to #18 and your
life
> will be easier. Clipping strands off the #16 will still leave
rough,
> oversize ends and increase the chance of an inadvertant short or
> connector issues (if the large wires cause undue stress). You say
> your motor is rated at 7 amps as well. What's the advantage of
the
> #16 here?
>
> Jeff
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark" <mail@t...>
> wrote:
> >
> > I have high torque Nema 42 rated over 2500 oz*in motors rated at
7
> > amps with a 16 amp 75 volt powersupply. I am having great
> > difficulty getting the 16 gauge wire into the Gecko terminals.
I
> > need to take them apart and look for to see if I can open the
tab
> > inside to get the larger wire to connect. This is a Bridgeport
> > Series mill rather than a desktop machine.
> >
> > Keith
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander
<awander@v...>
> > wrote:
> > > Keith:
> > >
> > > You can fit at least an 18AWG in the Gecko terminals
comfortably.
> > >
> > > The size you need depends on the amount of current that is
being
> > drawn, and
> > > without getting ridiculous, bigger wire(smaller Gauge number)
is
> > better, for
> > > reasons of resistance. If you look at the capacitance, though,
it
> > goes up as
> > > the wire size goes down(all else being equal) so this will
come
> > into play at
> > > some point, but usually this is only important where you are
> > talking about
> > > digital signaling, where the edges of the waveform must remain
> > crisp and
> > > square.
> > >
> > > Remember, too, that the maximum current draw of your motors
may
> be
> > a lot
> > > less than you think.
> > >
> > > I'm using 18AWG on my Gecko Stepper drivers, with a 53VDC
supply,
> > and 500
> > > oz-in steppers, rated at 3A(the current limit on the Geckos is
> set
> > at 3A.
> > > Seems to work just fine.
> > >
> > > Andy Wander
> > > Verrex Corporation
> > >
> > >
> > > -----Original Message-----
> > > From: Keith Clark [mailto:mail@t...]
> > > Sent: Monday, October 18, 2004 7:16 PM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: [CAD_CAM_EDM_DRO] Re: Gecko burned out
> > >
> > >
> > >
> > > There has been some controversy about tinning versus using
> > ferrules.
> > > My first question is what sized wire I should be using? I am
now
> > > using 16 gauge wire that I have thinned (not tinned) to allow
it
> > to
> > > fit into the Gecko terminals. What sized wire should I be
using
> > for
> > > the phases going to the motors. The terminals are sized for
much
> > > thinner gauged wire but it does not make sense to use a 28
gauge
> > (the
> > > size that fits nicely into the terminals)wire to connect to
the
> > > motors.
> > >
> > > Thanks
> > > Keith Clark