Today's Message Index:
----------------------
1. 10:06 AM - Re: B and C SD-8 dynamo problem (Robert L. Nuckolls, III)
2. 11:38 AM - Re: B and C SD-8 dynamo problem (Gautier, Thomas N (3262))
3. 01:46 PM - Re: Re: B and C SD-8 dynamo problem (Stephen Richards)
4. 05:37 PM - Re: B and C SD-8 dynamo problem (user9253)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: B and C SD-8 dynamo problem |
> 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
>don=B9t really like the idea of running the dynamo with the drill press for
>that long. Also I=B9d like to get the dynamo mounted on the engine.
Not all rectifier/regulators will come alive without
having voltage at "both ends" . . . i.e. both
input and output. They need a battery on line
to wake up.
The stock SD-8 R/R is thermally marginal. It will
be replaced with a more robust device shortly.
I'm assembling a drive stand to do detailed
energy studies on a range of R/R options for
all of the B&C PM alternators. Kind of swamped
right now with EMT classes but the drive stand
is about ready to run.
Emacs!
Please don't take this as any discouragement
for gathering your own data. I'd be pleased
to know your findings. 2400 RPM is a bit slow,
the SD-8 doesn't reach full rated output
below 3900 or so. Getting a grip on those
critters to spin them is a bit of a hassle.
Neal George fixed me up with some OEM mating
parts for the spline. I did find that a 12-point,
socket (11/16?) fits the male spline pretty
well. I have an adapter fabricated from a
socket that I elected not to use for permanent
tooling. You're welcome to it if it's useful
to you.
In any case, I suggest you mock up a complete
alternator-battery-load system. It should
come alive and work for you then.
Bob . . .
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: B and C SD-8 dynamo problem |
Joe,
When my Dynamo is rotating it's putting out >20 vac. But the regulator pu
ts out ~3vdc, at least it charges the capacitor to 3v over 10-15 seconds. T
hat 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 int
ended to wire it as shown in Z-13/8 Rev Q. The voltages mentioned below wer
e measured with respect to chassis ground at the points on Z-13/8 as descri
bed.
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 th
e full circuit, by applying 16 or 17 volts DC to the regulator input in pla
ce of the Dynamo. I expect the relay and other parts of the circuit will wo
rk 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 pla
ne 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
Time: 04:46:14 PM PST US
Subject: AeroElectric-List: Re: B and C SD-8 dynamo problem
From: "user9253" <fransew@gmail.com<mailto:fransew@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 p
aste.
Is the regulator grounded to the airframe during these tests?
We need to know exactly where both voltmeter leads are connected for each m
easurement.
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 sw
itch
on and off. If the lamp turns on and off, then the relay circuit is workin
g.
The relay should always be energized with 12 volts nominal (14 is OK), neve
r
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@jpl.nasa.gov<mailto:thom
as.n.gautier@jpl.nasa.gov>>
Subject: AeroElectric-List: 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
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: B and C SD-8 dynamo problem |
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
-----Original Message-----
From: "Gautier, Thomas N (3262)" <thomas.n.gautier@jpl.nasa.gov>
Sent: =8E17/=8E05/=8E2016 19:45
Subject: AeroElectric-List: Re: B and C SD-8 dynamo problem
Joe,
When my Dynamo is rotating it's putting out >20 vac. But the regulator pu
ts out ~3vdc, at least it charges the capacitor to 3v over 10-15 seconds. T
hat 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 int
ended to wire it as shown in Z-13/8 Rev Q. The voltages mentioned below wer
e measured with respect to chassis ground at the points on Z-13/8 as descri
bed.
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 th
e full circuit, by applying 16 or 17 volts DC to the regulator input in pla
ce of the Dynamo. I expect the relay and other parts of the circuit will wo
rk 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 pla
ne 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
Time: 04:46:14 PM PST US
Subject: AeroElectric-List: Re: B and C SD-8 dynamo problem
From: "user9253" <fransew@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 p
aste.
Is the regulator grounded to the airframe during these tests?
We need to know exactly where both voltmeter leads are connected for each m
easurement.
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 sw
itch
on and off. If the lamp turns on and off, then the relay circuit is workin
g.
The relay should always be energized with 12 volts nominal (14 is OK), neve
r
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@jpl.nasa.gov>
Subject: AeroElectric-List: 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
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: B and C SD-8 dynamo problem |
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?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456342#456342
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|