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nuckollsr(at)cox.net
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 Posted: Thu Jan 12, 2006 4:29 am Post subject: Oil Pressure warning light and hobbs driver? |
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At 06:34 AM 1/12/2006 +0000, you wrote:
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I have a Rotax 914 powering our Europa XS Monowheel. The oil pressure
sender changes from 0 ohms to 200 ohms.
Does any one make a device that that will turn on a light when oil
pressure is low, and turn on a electric hobbs when oil pressure is up?
Or a kit or plans?
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Is your engine running? You need to know the range of votlages
that appear the sensor terminal with engine stopped and engine
running. A circuit like our LV Monitor can be modified to
watch this voltage and produce the light action you're seeking.
It could probably be done with one of the boards we already
have.
Bob . . .
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rparigor(at)SUFFOLK.LIB.N
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| Posted: Thu Jan 12, 2006 6:52 am Post subject: Oil Pressure warning light and hobbs driver? |
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Hello Bob
Engine not running yet.
Anyone out there with a Rotax 914 (or a 912 or 912S) know the voltage at
the pressure sender when motor is off, and when at idle?
Sounds to me that this is a desirable product.
Thx.
Ron Parigoris
A circuit like our LV Monitor can be modified to
| Quote: | watch this voltage and produce the light action you're seeking.
It could probably be done with one of the boards we already
have.
Bob . . .
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tonyplane(at)bellsouth.ne
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| Posted: Fri Jan 13, 2006 8:39 am Post subject: Oil Pressure warning light and hobbs driver? |
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I may be wrong, but I believe the Rotac has a VDO Oil Pressure sender
whcih can be bought with two sender terminals - one terminal has an off/on
switch and the other has a variable resistor.
This is how I did it on the Jab 3000A, which came with two pick-ups on its
VDO sender.
The pickup labled WK on the VDO sender stands for warning contact, aka
"idiot light" pickup. This contact is normally closed with no oil pressure
and opens at about 8 psi. (The other pick up "feeds" the oil pressure
guage)
I installed a Radio Shcck PN 275-248 relay "velcroed" on the top of the
Hobbs (the relay is very small and rated for 10A at 24V). I wired the VDO
WK terminal to the NO coil pick up of the relay and the other relay coil
pickup wired to the master bus for its 12V pickup when the master is turned
on. This 12V wire is also spliced to feed into the COM of the relay. I then
wired the relay such that a wire from the NO on the relay fed to the + lead
of a red 12 V 1/4 in dia Radio Shack LED installed on the panel (the - lead
of the LED goes to ground). This LED lights up with the master switch ON
when there is zero or less than about 8 psi pressure. Another wire feeds
into the + of the Hobbs from the NC pickup of the relay. Another wire goes
from the - of the Hobbs to ground.
When there is Oil Press, the WK contact of the VDO opens and then the relay
switches the voltage/current to the Hobbs.
In summary. Zero or less than about 8 psi gives "idiot light" on panel.
On engine start, "idiot light" goes out (unless you have a problem) and
Hobbs starts running.
The relay and LED are very inexpensive. If you are unsure how to wire
them, study the diagram on the relay package, wire everything up on the
bench, and play with the combination.
Tony Graziano, Buchanan, Tn
Zodiac 601XL N493TG
-------------------
AeroElectric-List message posted by: <rparigor(at)suffolk.lib.ny.us>
| Quote: |
I have a Rotax 914 powering our Europa XS Monowheel. The oil pressure
sender changes from 0 ohms to 200 ohms.
Does any one make a device that that will turn on a light when oil
pressure is low, and turn on a electric hobbs when oil pressure is up?
Or a kit or plans?
|
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craig(at)craigandjean.com
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craig(at)craigandjean.com
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| Posted: Fri Jan 13, 2006 1:24 pm Post subject: Oil Pressure warning light and hobbs driver? |
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Summit Racing also has the VDO dual sender for $26:
http://tinyurl.com/c2mfw
-- Craig
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