Re: How can you test a stepper ?

ummm....

I have some old power supplies from some GE surplus, Acopian 5V high
amp, probably could reduce the voltage to the coil rating.

I see where you are going, no power, just movement.

My breakout board has 4 relays so I could use that to drive 4 amp
rated relays to power one of these units.

I didn't check a short to case, but I did check each winding against
each other.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> In a message dated 2/9/2003 2:07:56 PM Central Standard Time,
> davemucha@j... writes:
>
>
> > what would make a stepper go bad ?
> >
> Dave: Open or shorted winding. Shorted windings within ONE coil,
or shorted
> to the other winding. To case? Or, if you are fiddling with an "8-
wire",
> you might have pairs of coils' polarity swapped.
>
> Got a source of LOW voltage, but sufficient current, like an old-
fashioned
> "#6 dry-cell"? Or, say, a "lead-acid storage battery" with
the "straps"
> between cells accessible so you can attach a connection, each cell
giving you
> only 2 V. (Of course, a regulated "lab supply" putting out 1-2
VDC, up to
> 5-10 amp, etc., would be better!)
>
> With that, connect ONE winding to + and -. Then the other, as
well. Then
> "swap" the polarity of one winding. (A pair of DPDT switches would
make a
> neat "test jig"!) Does it step? Note the direction. Then "swap"
the OTHER
> pair of wires. Did it step? If so, it's probably OK!
>
> Lotsa luck!
>
>
> [Non-text portions of this message have been removed]