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thomas.n.gautier(at)jpl.n
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 Posted: Tue May 17, 2016 10:38 am Post subject: B and C SD-8 dynamo problem |
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Joe,
When my Dynamo is rotating it's putting out >20 vac. But the regulator puts out ~3vdc, at least it charges the capacitor to 3v over 10-15 seconds. That means to me that the regulator is not working in my test set.
I'm using the PMR-1 regulator sold with the SD-8 Dynamo by B and C. I intended to wire it as shown in Z-13/8 Rev Q. The voltages mentioned below were measured with respect to chassis ground at the points on Z-13/8 as described.
I misspoke slightly indicating that I wanted to test the control circuit at 16 or 17 volts. I meant, could I test the regulator, by itself or in the full circuit, by applying 16 or 17 volts DC to the regulator input in place of the Dynamo. I expect the relay and other parts of the circuit will work ok (TBD, of course) but right now the regulator is not producing output power.
I will not be able to fly the circuit for several more months as the plane is not done yet. Also, I would like to get the circuit operating on the bench instead of trouble shooting under the panel.
Nick
Sent from my iPhone
| Quote: |
Time: 04:46:14 PM PST US
Subject: Re: B and C SD-8 dynamo problem
From: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>
When the dynamo is rotating, both it and the regulator should be outputting voltage,
regardless of whether the relay is energized or not.
What regulator are you using? It should be mounted using heat-conductive paste.
Is the regulator grounded to the airframe during these tests?
We need to know exactly where both voltmeter leads are connected for each measurement.
The dynamo does not have to be rotating to test the relay. An easy test is to
put a 12 volt battery in the aircraft wired according to Z-13/8. Connect a
high wattage automotive lamp across the capacitor, then turn the AUX/ALT switch
on and off. If the lamp turns on and off, then the relay circuit is working.
The relay should always be energized with 12 volts nominal (14 is OK), never
with 16 or 17 volts.
The problem might be the test setup and not a component problem. The best test
is to install everything and go fly the plane. Stick-on temperature strips
can be affixed to the regulator to see how hot it gets.
--------
Joe Gores
|
Time: 12:12:01 PM PST US
From: "Gautier, Thomas N (3262)" <thomas.n.gautier(at)jpl.nasa.gov (thomas.n.gautier(at)jpl.nasa.gov)>
Subject: B and C SD-8 dynamo problem
Bob,
I am getting to the final stages of my RV-10 project for which I
selected Z-13/8 as the electrical system model. My system design is
essential identical to Z-13/8 rev Q from Appendix Z Rev.12A change 4,
except that I am using ordinary mags for ignition.
Its time to install the SD-8 dynamo on the engine so I finally, some
years after wiring it, got around to testing the control circuit for the
dynamo. I mounted the dynamo in a drill press to operate at about 2400 rpm
and arranged to load the dynamo/control circuit up to a maximum of 8A
using some modified electric toaster heating elements. I started with no
load.
My test set produces no output voltage. When I turn on the drill press
the voltage at the positive terminal of the capacitor rises to 3.1v over a
period of 10 or 15 seconds and stays there. The dynamo is producing over
20vac and the voltage at the negative terminal of the bridge rectifier is
about -13v.
I am in the process of wringing out my circuit construction to find the
problem but I would like your advice on a couple of issues. 1) Can you
suggest a definitive test of the voltage regulator module isolated from
the rest of the circuit? And 2) Can I test the control circuit without the
dynamo, perhaps with a DC supply for input power? If I can test it with DC
what voltage should I use? I imagine 16 or 17 volts would be right for
full 8A load. Would higher voltage be useful for lighter loads? I would
like to stress test my heat sinking arrangement for an hour or two but I
dont really like the idea of running the dynamo with the drill press for
that long. Also Id like to get the dynamo mounted on the engine.
Thanks for any advice you can give me.
Nick Gautier
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stephencliverichards(at)g
Guest
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| Posted: Tue May 17, 2016 12:46 pm Post subject: B and C SD-8 dynamo problem |
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Nick
are you sure that you do not have to apply 12v from the battery to the regulator initially with the generator running to start the regulator working.
Clive
From: Gautier, Thomas N (3262) (thomas.n.gautier(at)jpl.nasa.gov)
Sent: 17/05/2016 19:45
To: <aeroelectric-list(at)matronics.com> (aeroelectric-list(at)matronics.com)
Subject: Re: B and C SD-8 dynamo problem
Joe,
When my Dynamo is rotating it's putting out >20 vac. But the regulator puts out ~3vdc, at least it charges the capacitor to 3v over 10-15 seconds. That means to me that the regulator is not working in my test set.
I'm using the PMR-1 regulator sold with the SD-8 Dynamo by B and C. I intended to wire it as shown in Z-13/8 Rev Q. The voltages mentioned below were measured with respect to chassis ground at the points on Z-13/8 as described.
I misspoke slightly indicating that I wanted to test the control circuit at 16 or 17 volts. I meant, could I test the regulator, by itself or in the full circuit, by applying 16 or 17 volts DC to the regulator input in place of the Dynamo. I expect the relay and other parts of the circuit will work ok (TBD, of course) but right now the regulator is not producing output power.
I will not be able to fly the circuit for several more months as the plane is not done yet. Also, I would like to get the circuit operating on the bench instead of trouble shooting under the panel.
Nick
Sent from my iPhone
| Quote: |
Time: 04:46:14 PM PST US
Subject: Re: B and C SD-8 dynamo problem
From: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>
When the dynamo is rotating, both it and the regulator should be outputting voltage,
regardless of whether the relay is energized or not.
What regulator are you using? It should be mounted using heat-conductive paste.
Is the regulator grounded to the airframe during these tests?
We need to know exactly where both voltmeter leads are connected for each measurement.
The dynamo does not have to be rotating to test the relay. An easy test is to
put a 12 volt battery in the aircraft wired according to Z-13/8. Connect a
high wattage automotive lamp across the capacitor, then turn the AUX/ALT switch
on and off. If the lamp turns on and off, then the relay circuit is working.
The relay should always be energized with 12 volts nominal (14 is OK), never
with 16 or 17 volts.
The problem might be the test setup and not a component problem. The best test
is to install everything and go fly the plane. Stick-on temperature strips
can be affixed to the regulator to see how hot it gets.
--------
Joe Gores
|
Time: 12:12:01 PM PST US
From: "Gautier, Thomas N (3262)" <thomas.n.gautier(at)jpl.nasa.gov (thomas.n.gautier(at)jpl.nasa.gov)>
Subject: B and C SD-8 dynamo problem
Bob,
I am getting to the final stages of my RV-10 project for which I
selected Z-13/8 as the electrical system model. My system design is
essential identical to Z-13/8 rev Q from Appendix Z Rev.12A change 4,
except that I am using ordinary mags for ignition.
Its time to install the SD-8 dynamo on the engine so I finally, some
years after wiring it, got around to testing the control circuit for the
dynamo. I mounted the dynamo in a drill press to operate at about 2400 rpm
and arranged to load the dynamo/control circuit up to a maximum of 8A
using some modified electric toaster heating elements. I started with no
load.
My test set produces no output voltage. When I turn on the drill press
the voltage at the positive terminal of the capacitor rises to 3.1v over a
period of 10 or 15 seconds and stays there. The dynamo is producing over
20vac and the voltage at the negative terminal of the bridge rectifier is
about -13v.
I am in the process of wringing out my circuit construction to find the
problem but I would like your advice on a couple of issues. 1) Can you
suggest a definitive test of the voltage regulator module isolated from
the rest of the circuit? And 2) Can I test the control circuit without the
dynamo, perhaps with a DC supply for input power? If I can test it with DC
what voltage should I use? I imagine 16 or 17 volts would be right for
full 8A load. Would higher voltage be useful for lighter loads? I would
like to stress test my heat sinking arrangement for an hour or two but I
dont really like the idea of running the dynamo with the drill press for
that long. Also Id like to get the dynamo mounted on the engine.
Thanks for any advice you can give me.
Nick Gautier
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user9253
Joined: 28 Mar 2008
Posts: 1935
Location: Riley TWP Michigan
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| Posted: Tue May 17, 2016 4:23 pm Post subject: Re: B and C SD-8 dynamo problem |
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If your regulator does not work, you might consider buying a John Deere regulator. Search eBay for AM101406 & MIA881279 & JDR1406
The John Deere regulator uses the case for ground. There is no negative terminal.
Instead of using the airframe as a reference point, connect the black meter lead to the regulator negative terminal and then measure the voltage on positive terminal.
I would not connect a DC voltage to the AC input on the regulator without knowing what affect that would have.
Question for others: Can a 16 volt doorbell transformer be connected to the regulator AC input or is the frequency too low?
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