Re: (ET) Reverse Relay

["Dave & Deb" <daveb drizzle com>]

got both the socket and relays from hosfelt.com an electronic surplus 
outlet. 
their stock can be spotty but for something like the sockets I think they 
have
those pretty much all the time.  the relays are a different matter.  If I 
remember
correctly the relay was 48 volt but I'm not positive about that.  I do 
know it was
not 36v...  Also the relay was encased in a clear plastic shell rather 
than being
open to dust and dirt like the original.


>
> Dave,
>       Where did you find the socket to put the relay in? That would be
> VERY convenient. I assume you can just connect the spade connectors to 
> the
> socket, so if you *do* need to change a relay, you don't have to deal 
> with
> unplugging and keeping track of all the wires, just plug the new relay
> into the socket?
>       What current rating fuse did you put in?
>       Hmmmm.... perhaps a circuit breaker would be nice there too
> instead of a fuse....
>
> Thanks,
> Mike
> --
>
> --------------------------------------------------------------
> Michael S. Briggs
> UNH Physics Department
> (603) 862-2828
> ---------------------------------------------------------------
>
> On Tue, 1 Aug 2006, Dave & Deb wrote:
>
>> this is a pretty common problem.  after my second relay welded itself I 
>> put an
>> inline fuse in to protect the relay and then just for good measure and 
>> because I
>> found some that would work and were cheap bought a socket for the relay 
>> and 6
>> relays.  needless to say I never welded another relay after that.
>>
>> the relays I bought for 2.50 each from hosfelt.com
>>
>> dave
>>
>>
>>
>>>
>>> Ok,
>>>     Now that I figured out how all the connections are made to the
>>> relay (it is a different style than the original one, so the 
>>> connections
>>> are not the same as in the manual - that's what was screwing me up, 
>>> since
>>> the way it's supposed to connect in the manual (as far as which poles
>>> connect when) isn't the same as this relay is supposed to work). At any
>>> rate, I've now verified that the relay is in fact blown - one of the
>>> contacts that moves when the relay is activated is welded together, so
>>> effectively the field current is able to bypass the field coil when in
>>> forward. Ok, so hopefully those relays I ordered last week will be here
>>> soon. :)
>>>
>>> Thanks for the help everyone,
>>> Mike
>>>
>>> --
>>>
>>> --------------------------------------------------------------
>>> Michael S. Briggs
>>> UNH Physics Department
>>> (603) 862-2828
>>> ---------------------------------------------------------------
>>>
>>> On Tue, 1 Aug 2006, Michael S Briggs wrote:
>>>
>>>>
>>>> Duh, just answered my own question - the extra two connections on the
>>>> bottom must be for the power to control the relay. :)
>>>>    Ok, so that answers that. But, the wires aren't connected to the
>>>> relay in the way the schematic shows (i.e. ignoring the bottom ones 
>>>> that
>>>> are for powering the relay, the middle (of the three in the manual) 
>>>> on the
>>>> right is supposed to have wire 10 connected - but my wire 10 is 
>>>> connected
>>>> to the bottom one on the right (not counting the real bottom ones, 
>>>> which
>>>> power the relay). So, either something is wired wrong (but it *was*
>>>> working, so I'll assume that's not the case), or this is a 
>>>> non-original
>>>> style of relay that has the connections different from in the service
>>>> manual. If that's the case, I need to figure out where the wires are
>>>> connected to this one, and how it's *supposed* to work.
>>>>
>>>> Mike
>>>>
>>>>
>>>
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>>>
>>
>>
>
>