Re: DC Motor Control: H-Bridge +5A, 48v

In article <568g81p1sehenbuar1c2s34vq44mhv45p5@xxxxxxx>,
cdsmith69NOSPAM@xxxxxxxxxxxxx says...
> On Sun, 15 May 2005 13:02:35 -0400, R Adsett
> <radsett@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> >In article <08hd81ljmva0s6b5fn41is14ecab38sgls@xxxxxxx>,
> >cdsmith69NOSPAM@xxxxxxxxxxxxx says...
> >> On 13 May 2005 19:13:30 -0700, Winfield Hill
> >> <hill_a@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >>
> >> >Carl D. Smith wrote...
> >> >>
> >> >> But that design never made it to production, as it was in
> >> >> progress at the time of the Great Downsizing that left the
> >> >> company with 1 employee.
> >> >
> >> > What was the name of the company, and what happened to it?
> >>
> >> Schaeff Incorporated. They eventually somewhat came back and are
> >> still around.
> >
> >Now they weren't on my list of suspects. I wasn't aware they were
> >developing their own controller.
>
> But you were aware of the existence of Schaeff Inc?

I was. The only separtely excited development work I was aware of at the
time was at Raymond though.

> Actually they developed all the electronics for their products
> before the Great Downsizing. Which consisted of all the
> different models of the W-Series and ECHO forklift product lines.
> The other products they have on their web page now were acquired
> from other companies. They also wrote all the control software
> for the forklifts, which I occasionally had a part in, between my
> hardware design projects.

My emphasis started off in the other direction. I did the control SW and
as resources grew tighter (fewer people) I started picking up the
electronics. A physics background seems to produce a bit of a JOAT.

> During my years there I put much work into improving the design
> of the system controller and operator display PCBs in the
> W-Series, and I designed the system controller, operator display
> PCB, and power supply / hydraulic coil driver PCB for the ECHO
> model, among other things.
>
> >Your tale sounds very familiar.
>
> How so?

I worked for SRE Controls. At one point we were down to 3 people. One
person in production, one management etc and me. I was R&D, customer
support, and 1/2 dozen other things for a while. They've since gone
through receivership and re-emerged.

Resources were almost always quite constrained.

One of my experiences with customer service early on involved, for lack
of a better term, a Samson test. I had gone down with another employee
to replace a controller at a customer site. We replaced it, got some
feedback on the behaviour of the diagnostics and sent the truck back into
service. The driver took the forklift, placed it against a load bearing
pillar and pressed the accelerator to the floor! The wheels slipped an
1/8 of a turn or so and the truck stalled. He held it there for a
moment, sort of nodded said "it seems to work" and headed off. At which
point I sort of picked my jaw up off the factory floor and we left.

Robert
.

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