Today's Message Index:
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1. 09:17 AM - Re: Re: Yak 55M Voltage regulator Overvoltage? (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
2. 09:44 AM - Re: Re: Yak 55M Voltage regulator Overvoltage? (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
3. 04:24 PM - EIS 4000 for sale (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
Message 1
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| Subject: | Re: Yak 55M Voltage regulator Overvoltage? |
Rob,
While I didn't say it out-loud, I already know what happens when you do
what I was talking about earlier. I am pulling the actual terminal
marking from memory, but on the DMR-200 I think it is the terminal
marked with "A" that connects directly to the MAIN CONTACTOR coil
itself. If you put 28 VDC on that terminal, the MAIN CONTACTOR relay
will close and complete the circuit between generator output and main
aircraft 28 VDC bus.
While I do not recommend this to anyone else, I have connected that
terminal to a switch inside of my aircraft, so that I can close the MAIN
CONTACTOR relay manually if I desire to. It is wired to the old oil
dilution switch, which is of course spring loaded "OFF". You can
probably figure out why I have done this.
So toss theory out the window at this point. If you close the main
contactor relay on the DMR-200 with the engine not running, the main
battery fuse will blow. Or I should say: "At least mine did". [wink
to you too!] :-)
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Rob Rowe
Sent: Tuesday, June 05, 2012 10:35 PM
Subject: Yak-List: Re: Yak 55M Voltage regulator Overvoltage?
>
> mark.bitterlich(at)navy.m Posted: Tue Jun 05, 2012 5:03 pm
> ...
> If the main contactor was indeed fused closed, when the engine
stopped,
> it should blow the main battery fuse, because at that point the
"motor"
> would not be spinning and would represent a dead short to ground, or
> darn close to it.
> ...
>
Fair point Mark, but with the differential shunt relay in series (as
Brian mentioned) plus battery internal resistance, generator windings
etc only needs to be collectively c.1ohm and the current gets limited to
20+Amps, maybe not enough to take the main fuse out.
With the differential shunt (reverse current) relay needing 10-25 Amps
(from spec) to operate anyway then a corroded / loose connection could
readily add a few ohms and prevent the contactor release from even being
triggered.
Have just noted the -55M doesn't have an ammeter as standard fit, so
scratch that check option.
Anyway let's see what Mark S come back with, if nothing else it will at
least help eliminate this from the potential fault list [Wink]
Cheers, Rob R
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=374812#374812
Message 2
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| Subject: | Re: Yak 55M Voltage regulator Overvoltage? |
On the Russian designs, the DMR-200 Combined Device contains the reverse
current cut-out circuit. There are a number of relays contained in that
device, one of which is used for reverse current sensing. The reverse
current relay is in series with the Main Contactor relay. When the
reverse current sensing relay is activated, it in turn removes coil
voltage from the main contactor relay thus opening the circuit from
generator output to the main aircraft bus.
If the DMR-200 main contactor relay is closed with the generator at
rest, the battery fuse will blow in a YAK-50.
I know that because ... I've done it.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Brian Lloyd
Sent: Tuesday, June 05, 2012 1:59 PM
Subject: Re: Yak-List: Re: Yak 55M Voltage regulator Overvoltage?
On Tue, Jun 5, 2012 at 10:00 AM, Bitterlich, Mark G CIV Det Cherry
Point, MALS-14 64E <mark.bitterlich@navy.mil> wrote:
Cherry Point, MALS-14 64E" <mark.bitterlich@navy.mil>
Rob, I think his voltage measurements were at the generator and
not the
main bus. Don't know that for sure, but I think so.
This would make 15 volts at idle pretty normal. (The DMR-200
would open
and you would be reading straight generator voltage)
If the main contactor was indeed fused closed, when the engine
stopped,
it should blow the main battery fuse, because at that point the
"motor"
would not be spinning and would represent a dead short to
ground, or
darn close to it.
Agreed?
That is certainly what I would expect if the cutout relay (what I think
you are calling the main contactor) were to weld closed. It is intended
to open when current starts to flow from bus to generator armature
rather than the other way around. OTOH, the overcurrent relay would
probably prevent serious damage.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 3
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| Subject: | EIS 4000 for sale |
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Mark Bitterlich
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