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ScottB
Joined: 29 Aug 2012
Posts: 3
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 Posted: Wed Aug 29, 2012 11:51 am Post subject: DMP-200 Relay Needed for Yak 52 |
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Our good ol' generator went off line and our troubleshooting finally led us to the DMP-200 latching relay. I dug the glue out of the screw holes and when we got the cover off it was totally burned inside and two melted balls of copper fell out onto the floorboard. Suffice it to say we found the smoking gun.
With all the Yak's that have gotten the alternator conversion I figure there's got to be a bunch of these relays out there collecting dust on the shelf (or perhaps riding along as dead weight and still installed on the firewall?).
Please advise if you have one available and how much you'd like for it. We sure would appreciate it.
Thanks,
Scott
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mark.bitterlich(at)navy.m
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| Posted: Wed Aug 29, 2012 12:22 pm Post subject: DMP-200 Relay Needed for Yak 52 |
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Scott, I hope you find one. They are somewhat rare for some reason.
There are actually a number of relays inside that device, which is kind
of why it is called "The Combined Device". It has two standard 28 volt
relays that are easy to replace, one main current contactor (the big one
with the cover on top), and one reverse current relay.
It actually CAN be repaired if you know a little bit about electronics.
The only relay that would be a real hassle would be the reverse current
relay itself. That does not usually fail. So when you are talking
about "totally burned out" you might not be as bad off as you thought.
Take a hard look at what "melted", and take a picture and post it if you
can.
If you can find a used one that someone is willing to part with ...
GREAT! I suggest you get TWO! 
If you can't, let me know and I can possibly show you how to put in
milspec 28 vdc relays to replace the ones that burned out. My GUESS is
that the main contactor relay froze in place, allowing total reverse
current to occur, which then melted the thing. That would be about the
only thing that would actually cause it to MELT like you are talking
about. I am surprised that your main battery fuse did not blow when
this happened. There is also a possibility of damage to the main power
contactor relay external to this device as well... this is the one that
is turned on when you switch the MASTER on.
In any case, with that relay REMOVED (be careful of nothing touching
ground!) you should be able to turn on your electrical master and have
normal battery power. If that does not happen, you have other damage as
well... but since you just said the "generator went off-line", you might
have gotten very lucky.
I highly recommend the B&C SK-35 for replacement, and install is dead
easy. If it comes to that.
Best of luck,
Mark Bitterlich
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ScottB
Joined: 29 Aug 2012
Posts: 3
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| Posted: Thu Aug 30, 2012 12:46 pm Post subject: Re: DMP-200 Relay Needed for Yak 52 |
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Mark.
Thanks for that info. Attached is a photo I took today with the unit still installed in the airframe. It looks to me like one whole side of the relay burned off. I also took a photo of the two balls of copper that liberated themselves at disassembly. (Formerly braided wire on the burnt side) I will remove the unit and (carefully) try your suggestion to see if we can get battery power with it removed. We did recharge the batteries and have been able to use normal battery power and all electrical systems (sans the charging system, of course) with no problems.
Would love to learn how to replace it with a mil-spec 28v relay. Please advise.
Would also love to install the B&C unit with solid state voltage regulator as you suggested but due to budgetary restrictions we are unable at this time.
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