Post some photos of the contactor somewhere  and maybe I can help.
Gus

On 2006-Aug 09, at 09:06hrs AM, Martin K wrote:

I have a problem with a contactor (relay) dropping out in an industrial
control system. The contactors have 24VAC coils. I have hooked an
oscilloscope to the 24V line and it appears to not have an issue with
sagging, but it's hard to tell even on an oscilloscope when the event
could be happening for just a few mS.
Is it common for contactors to wear out in a method that prevents them
from staying on, or should I be looking closer at the circuit that
controls the coil?
The contactor is supposed to be latched with another smaller relay that
is fed by a momentary switch. After several attempts at getting it to
stay on, it will eventually stay on for an extended amount of time
(presumably when something warms up?) and perhaps drop out at an
inopportune moment.
I know I haven't provided a lot of info but hopefully someone has had a
similar issue - I don't have much experience with this.
Thanks,
Martin K

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Gus S Calabrese
Denver, CO
720 222 1309     303 908 7716 cell
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