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(ET) Help, reverse missing?



 
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            Merged replies for two posts.Message thread truncated to avoid bouncing.
 
           Yes. The later contactors make for a much simpler arrangement.If you wanted to try to fix what you have as an exercise all the individual pieces are functionally identical.Your assumption about 1F &2F being OK is correct.
 
          The other contactors that bypass the armature resistors are just swell if you have three forward traction motor speeds. :)  { In Forward. You are only allowed two speeds in Reverse.}
         If one of these were to fail open such as your reversing contactors, you would be missing a speed change but the tractor would still move.
 
       Each reversing  coil and contact unit is a separate entity.All do the same function when energized, and the mechanical interlock[ Those little pins that you better not lose if you decide to try to repair them. :( ] between opposing contactors assures that nothing bad can happen due to a set on contacts being closed when it shouldn't be.
 
 
 
RJ
 
----- Original Message -----
Sent: Monday, February 25, 2008 6:48 AM
Subject: RE: (ET) Help, reverse missing?

No I didn?t test individually.   Harold Z said I could upgrade to the later style connectors (6 terminals).   It would be cheaper.    Would you recommend this?

 

From: RJ Kanary [mailto:rjkanary nauticom net]
Sent: Monday, February 25, 2008 12:45 AM
To: Banks, Michael J.; elec-trak cosmos phy tufts edu
Subject: Re: (ET) Help, reverse missing?

 

    At least ONE set of contacts is not achieving closure if no armature voltage is present.[With four sets present, you can see how much fun this will be. <G>]    

            

         Were you able to separate the coils electrically and verify them individually ? You will have to disconnect wires in order to do that.

 

                 After that, we'll have to verify which set of contacts are not achieving closure when the coils are energized.

 

     Generally speaking, the double coil contactors aren't separated and serviced. But that doesn't mean it can't be done.  :)

 

       The usual repair is to replace both sets of two coils and the contacts that go with them.

{1F/2R and 1R/2F }

 

RJ

  

 

----- Original Message -----

Sent: Sunday, February 24, 2008 4:27 PM

Subject: RE: (ET) Help, reverse missing?

 

OK, I did my testing today.

14-01  and 44-01 both had voltages on them.

 

So does that mean that the 1R / 2F component is bad?

 

Is there something else to test?   When you say replace both? Do you mean replace both 1F/2R and 1R/2F?     Or do you only replace one piece like 1R (not 2F)?