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Re: (ET) E15 operational. Rusty, but operational.

On 10/17/2011 1:18 PM, Jim Coate wrote:

Glad you like it. There are advantages to having the GE drawings when
manufacturing new parts :-)

It sounds like there is something wrong with your card 1 (or elsewhere)
for the the contacts to get melted off so easily. The design itself
wasn't so bad, it just has reliability issues as everything has to be
working properly since the failure modes are annoying. If everything
works right, there are time delays that prevent contact damage. In real
life, add a little mouse pee and corrosion to some well aged capacitors
and who knows what goes on.
Ok, this seems to happen a "lot" to people, so if it's not "normal" then there has to be a root cause.
The MOV can't be it; that is a huge amount of current flowing when that relay opens under load. So it has got to be "something else". I remember seeing something about a circuit in there that will not flip the relay unless the current in the field is low or the voltage is zero or some-such.
I'll look at the schematics over the next few days and see. Maybe a timer cap failed on my board. 

Chris