RE: (ET) Odd reverse behaviour

["Markus Lorch" <mlorch vt edu>]

Chris,

I was able to alleviate connectivity problems on my card edge 
connector by bending the connector pins back out. They did not
apply enough pressure anymore as they were not sticking out 
beyond the plastic guide rails of the connector anymore.

A way to test if the card connector is your problem is to run 
the motor while compressing the card connector. Be aware the 
pressure applied from the wires to the connector makes it 
behave differently when the back panel is closed vs. when
it is open. 

My problems also started after I had taken the card out and
back in for repairs, disconnecting it - so its possible the same
happens to you after replacing your diodes.

Also check if the connectors plastic casing is cracked. I had 
that on my second E20 and ended up soldering the wires directly
to the card.

Hope this helps

Markus

> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu 
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of RJ Kanary
> Sent: Samstag, 23. Oktober 2004 23:47
> To: Chris Zach
> Cc: Elec-trak list
> Subject: Re: (ET) Odd reverse behaviour
> 
> 
>    The hair puller on that set up is the connector itself. It 
> starts to 
> split open, making many poor and  / or intermittent 
> connections. I ended up 
> soldering flying leads on mine, and buying connectors at RadioShackR.
>      One of the neat things that poor connections at that 
> card can give you 
> is unexpected low field voltage in Reverse. That provides a 
> ride that you 
> will not soon forget !
> 
> ----- Original Message ----- 
> From: "Chris Zach" <czach computer org>
> To: "RJ Kanary" <rjkanary nauticom net>
> Cc: "Elec-trak list" <elec-trak cosmos phy tufts edu>
> Sent: Saturday, October 23, 2004 11:22 PM
> Subject: Re: (ET) Odd reverse behaviour
> 
> 
> >8 speed CA. Hm. I would believe a problem with the card; I 
> blew out a few 
> >doides awhile back and replaced them. Back to the drawing board. The 
> >question will be what went bad (as the shunt circuits are working)
> >
> > Chris
> >
> >
> > RJ Kanary wrote:
> >>        What model is your E-20? Mine is an 8 speed CA 
> model, and cruise 
> >> is NOT locked out in Reverse.Reverse problems are usually 
> found to exist 
> >> on the card edge connector. Look there first.
> >>
> >> ----- Original Message ----- From: "Chris Zach" 
> <czach computer org>
> >> To: "Elec-trak list" <elec-trak cosmos phy tufts edu>
> >> Sent: Saturday, October 23, 2004 4:44 PM
> >> Subject: (ET) Odd reverse behaviour
> >>
> >>
> >>> Ok, this is a bit odd and needs to be fixed.
> >>>
> >>> My E20 has a problem with reverse. If you go into reverse 
> and press down 
> >>> on the pedal slowly you get into speed 1, but never 
> higher than that 
> >>> (speeds 2,3,4 ignored). If you floor the pedal quickly 
> you get into 
> >>> speed 3, then 2,1 as you let up. Go to zero, press the 
> pedal normally 
> >>> and you only go to 1.
> >>>
> >>> I know the E20 has a lockout in series with the FW 
> resistors to lock out 
> >>> speeds 5-8 and the cruise control in reverse, but why no 
> speeds other 
> >>> than 1 unless I floor it fast?
> >>>
> >>> Odd. FWIW, I watched the relays, no difference. Forward 
> works perfectly.
> >>>
> >>> Chris
> >>>
> >>> _______________________________________________
> >>> Elec-trak mailing list
> >>> Elec-trak cosmos phy tufts edu
> >>> https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >>>
> >>
> >>
> > 
> 
> 
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