Re: Is it possible to change the BP motor to eliminate shifting?

Gary,

Sounds like a possibility. I appreciate the info. Do you think
there is much difference between the 2 types you have pointed me to
on EBay? since I have no experience.

It does sound like with the jog feature on the VFD and limit switches
that I could very well get it to work. Althought the shifting is
somewhat cumbersome, it takes some movement of the spindle, which the
VFD can do in a jog mode, and when it goes into gear there is a
definite movement of the lever into a constant position that could
very well be sensed by a proximity switch.

My only problem is lack of inputs on my breakout board. Since I have
all my limit switches in series there are y + and - limit inputs open
that could be used for the 2 limits on the shifter. Perhaps a VB
program could do everything else and an additional output would not
be needed?

Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, gary <garyclick1@c...> wrote:
> I use Flo-Tork units for Railway Applications (about 350 to date
without
> a failure) and have use the same setup to shift speed and direction
on
> Oil-Gear Hydraulic Units where speed and direction is controlled by
a
> rotary spool valve.
>
> I would recommend looking at using the end proximity switches to
> indicate when a shift is complete. If the proximity's are monitored
by a
> simple relay setup so that the run forward and run reverse inputs
of the
> VFD are inhibited whenever both proxies are low this should not
allow
> the motor to be started with an incomplete shift. The same relays
could
> be allowed to send a jog forward or jog reverse to the VFD until
the
> shift is complete. This is a "jog and rake" type shift but using a
very
> low jog preset on the VFD should minimize the rake.
>
> You might look at:
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&category=78187&item=7507207538&rd=1
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&category=78187&item=7506594396&rd=1
>
> gary