Today's Message Index:
----------------------
1. 09:40 AM - overvoltage relay protection module for CJ6A (Brian Lloyd)
2. 11:15 AM - Re: overvoltage relay protection module for CJ6A (Walter Lannon)
3. 11:36 AM - Re: overvoltage relay protection module for CJ6A (Brian Lloyd)
4. 05:26 PM - Re: overvoltage relay protection module for CJ6A (Brian Lloyd)
5. 06:13 PM - Vote (cjpilot710@aol.com)
Message 1
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| Subject: | overvoltage relay protection module for CJ6A |
--> Yak-List message posted by: Brian Lloyd <brian-yak@lloyd.com>
I have been talking with Bob Nuckolls, designer of the B&C regulator,
about the OV problem with CJ6As. He is working on a module for the CJ6A
electrical system that will work with either the mechanical regulator or
the solid-state regulator. Here is what he sent to me this morning:
> I've decided to stay with the relay approach to
> avoid some development risks. The sensor module will
> fit in a 1.4 x 1.4 x .7 inch potted housing and
> be fitted with a 9-pin d-sub connector. The
> module will be self-resetting . . . comes up in
> the ON state when system powers up and pulls in
> relay in series with generator field switch.
> Upon sensing 32-33.5 volt condition for at least
> 100 milliseconds, the relay will be opened and an
> OV warn light will be illuminated. There will be
> a push-button input for OV RESET.
He wants us to install it and then run it through about 50 trip cycles
in flight so he can examine the relay to make sure it is handling the
trip loads properly (inductive spike from the field when you open it
suddenly).
One of the nice things about this is that if it fails, the generator
just fails to come on line and your generator light will stay on. This
means it can do no harm.
A tripped indication would be the combination of the red generator
lights and a second OV light (which you get to install).
Bob says he should have the first one in about 10 days. He has not given
me a price so I am guessing that it should be in the $50-$100 range. I
need a show of hands for everyone who might want one. Frankly, if you
have a CJ and it has the standard generator, you should install one
regardless of whether you have a mechanical or solid-state regulator.
Even though it is less likely, it is still possible for a mechanical
voltage regulator to fail and destroy the battery and/or cause a fire.
Gentlemen in the central California area: I need a guinea pig, someone
whose airplane I can use to develop the installation instructions and to
do the testing of the module in flight. I would especially like to find
an airplane that has big electrical loads, e.g. it still has the working
ADF or it has one of those quartz radiant heaters installed. We need to
do the trip testing at as high a generator load as possible. (Jim Selby:
can you help me out here?)
--
Brian Lloyd 2243 Cattle Dr.
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
Message 2
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| Subject: | Re: overvoltage relay protection module for CJ6A |
--> Yak-List message posted by: "Walter Lannon" <wlannon@cablerocket.com>
Brian;
I am in for at least one . Will discuss with my CJ customers for additional
units. Thanks.
Cheers;
Walt
----- Original Message -----
From: "Brian Lloyd" <brian-yak@lloyd.com>
Subject: Yak-List: overvoltage relay protection module for CJ6A
> --> Yak-List message posted by: Brian Lloyd <brian-yak@lloyd.com>
>
> I have been talking with Bob Nuckolls, designer of the B&C regulator,
> about the OV problem with CJ6As. He is working on a module for the CJ6A
> electrical system that will work with either the mechanical regulator or
> the solid-state regulator. Here is what he sent to me this morning:
>
>> I've decided to stay with the relay approach to
>> avoid some development risks. The sensor module will
>> fit in a 1.4 x 1.4 x .7 inch potted housing and
>> be fitted with a 9-pin d-sub connector. The
>> module will be self-resetting . . . comes up in
>> the ON state when system powers up and pulls in
>> relay in series with generator field switch.
>> Upon sensing 32-33.5 volt condition for at least
>> 100 milliseconds, the relay will be opened and an
>> OV warn light will be illuminated. There will be
>> a push-button input for OV RESET.
>
> He wants us to install it and then run it through about 50 trip cycles
> in flight so he can examine the relay to make sure it is handling the
> trip loads properly (inductive spike from the field when you open it
> suddenly).
>
> One of the nice things about this is that if it fails, the generator just
> fails to come on line and your generator light will stay on. This means it
> can do no harm.
>
> A tripped indication would be the combination of the red generator lights
> and a second OV light (which you get to install).
>
> Bob says he should have the first one in about 10 days. He has not given
> me a price so I am guessing that it should be in the $50-$100 range. I
> need a show of hands for everyone who might want one. Frankly, if you
> have a CJ and it has the standard generator, you should install one
> regardless of whether you have a mechanical or solid-state regulator.
> Even though it is less likely, it is still possible for a mechanical
> voltage regulator to fail and destroy the battery and/or cause a fire.
>
> Gentlemen in the central California area: I need a guinea pig, someone
> whose airplane I can use to develop the installation instructions and to
> do the testing of the module in flight. I would especially like to find
> an airplane that has big electrical loads, e.g. it still has the working
> ADF or it has one of those quartz radiant heaters installed. We need to
> do the trip testing at as high a generator load as possible. (Jim Selby:
> can you help me out here?)
>
> --
> Brian Lloyd 2243 Cattle Dr.
> brian-yak at lloyd dot com Folsom, CA 95630
> +1.916.367.2131 (voice) +1.270.912.0788 (fax)
>
> I fly because it releases my mind from the tyranny of petty things . . .
> - Antoine de Saint-Exupery
>
>
>
Message 3
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| Subject: | Re: overvoltage relay protection module for CJ6A |
--> Yak-List message posted by: Brian Lloyd <brian-yak@lloyd.com>
Walter Lannon wrote:
> --> Yak-List message posted by: "Walter Lannon" <wlannon@cablerocket.com>
>
> Brian;
>
> I am in for at least one . Will discuss with my CJ customers for
> additional units. Thanks.
Thanks. I know there is a market for at least one unit. ;-)
BTW, for those of you who have installed GM truck alternators in place
of the standard generator, you have a potential problem too. These
alternators have an internal regulator that does not have any OV
protection. It can fail the same way as the Chinese solid-state VR. (I
had one fail in a car and destroy the battery.) Bob has a crowbar
overvoltage protection system for internally regulated alternators that
involves installing a battery contactor between the alternator and the
bus. If the alternator's regulator fails and drives the voltage too
high, the crowbar activates and removes the power from the contactor.
The contactor opens and disconnects the alternator from the bus thus
protecting the battery and avionics.
You can modify the alternator to get power from its regulator externally
and then you can turn it off by just removing the drive from the field
circuit but that requires more effort.
Things to think about.
--
Brian Lloyd 2243 Cattle Dr.
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
Message 4
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| Subject: | Re: overvoltage relay protection module for CJ6A |
--> Yak-List message posted by: Brian Lloyd <brian-yak@lloyd.com>
Bob has confirmed that the cost for the over voltage protection module
will be under $100. He expects it to be around $75.
Let me know if you want one. (Every CJ6A with the stock generator needs
one.)
--
Brian Lloyd 2243 Cattle Dr.
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
Message 5
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No need archive:
You Troops in the SE region of RPA.
Vote. Particularly if you are in favor of the new By-laws. There are 33
members down here who have not voted so far. Since by-laws require a 2/3
majority is to pass, not voting or failing to vote, is the same as a no vote.
Even
if your vote is no, still vote. We need to know if you are getting the message.
Now I personally hope you'll vote for the by-laws. I truly believe that
regional representation of the BoD is the best direction for RPA to go. This is
the major change in the By-laws that I personally feel strongly about. Are the
By-laws perfect? None ever are. But I believe this is the best step forward.
Merry Christmas, Happy Hannukah , and Happy New Year.
Jim "Pappy" Goolsby
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