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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.
----- 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)?
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