Re: Progress 5amp stepper board

I would check the two 4700 pf caps on the Z axis. It sounds like the chopper
isn't chopping correctly thus causing the fuse to blow.
Make sure you haven't blown the fets on the Y axis.
Remeber that a pulse must be on the Y axis for it to start. Once activated
check the output of the two phases. If nothing is present then the problem
would seem to be a solder joint probably on the 3517.
Dan
-----Original Message-----
From: Peter Smith <peter@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Friday, September 10, 1999 11:33 AM
Subject: [CAD_CAM_EDM_DRO] Progress 5amp stepper board

>From: "Peter Smith" <peter@...>
>
>Dan
>I have got the stepper board built into an enclosure, I thought I was on

the last lap,

>I have just finished assembling and testing the power supply, after

testing the power supply (all OK), and without thinking I proceeded to
connect it up to the board with the cap fully charged, (Idiot) the end
result being X axis OK Z axis runs but at mid range revs the motor goes
erratic and eventualy blows fuse Y axis nothing at all, although a logic
probe appears to check everything out OK at the plug end, but there is no
power there when the stepper is plugged in .( an expensive lesson on
Capacitors) I have now got a 24v bulb temporarily across the Cap to bleed it
off when switching.

> I have started again with the board, testing from the beginning,

Logic 5v is OK,

>555 timer is OK, I have removed the 3 3300 caps and all axis are open

circuit, no shorts, I think there are two mossfets down on the Z axis, which
I have ordered localy, but I cannot think what is wrong with the Y axis,
when checked out with meters all is OK, but it won't drive a motor. Will
there be any of the smaller items on the board, or the ICs damaged, I have
run the X axis with the ICs from the Y axis, and it runs, so they seem to be
OK.

> Any advice would be welcome,
>
> Well most dissapointing after such a good start, Pass the whisky

Arne,

>
>Best Wishes
>Peter Smith
>
>
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