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ron.mcgann(at)baesystems.
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 Posted: Sun Apr 15, 2007 8:52 pm Post subject: GNS 430 wiring (was Everybody doing taxes?) |
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With all the tax prep being done, hopefully someone can help me with a simple question.
Section 4.2.2.2 of the GNS430 installation manual refers to Lighting Bus Hi and Lighting Bus Lo connections on P4001. Section 5.2.6 defines the lighting config pages but does not dicsriminate between the Hi and Lo buses. Assuming the Hi bus is connected to a 14V dimmer cct, what is Lighting Bus Lo used for?
cheers,
Ron
187 finishing
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dc71(at)netspace.net.au
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| Posted: Mon Apr 16, 2007 2:29 am Post subject: GNS 430 wiring (was Everybody doing taxes?) |
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Sorry - I'm sending this email as a means to procrastinate about doing my Quarterly BAS (Business Activity Statement) and PAYG (Pay as you go) tax to the ATO (Australian Tax Office).
Lighting Bus Lo = negative or ground for DC voltages.
Lighting bus Hi can be configured to accept various voltages. Apparently the selection of incorrect voltage doesn't damage the unit - see page F-27, figure F-13, note 4 of the installation manual.
I've just been through this with my 430. I have a Flight Design Systems LC40e dimmer controller, which is basically a pulse width modulated unit. Connecting the 430 to this produces a visible (and annoying) pulse in light intensity. I fiddled with various settings/offsets on the lighting setup on the 430, but found that none were satisfactory to me - ie eliminated pulsation, but gave reasonable response to turning the dimmer knob. The automatic setting using the built-in photocell is entirely adequate for varying illumination levels. The other answer would be to run a voltage straight through a potentiometer to the 430 lighting bus, but the idea of wasting precious electrons as heat makes me cringe!
Hope this helps
Indran
#40228 - Looks like an aircraft, but isn't one yet!
On 16/04/2007, at 12:51 PM, McGANN, Ron wrote:
| Quote: | With all the tax prep being done, hopefully someone can help me with a simple question.
Section 4.2.2.2 of the GNS430 installation manual refers to Lighting Bus Hi and Lighting Bus Lo connections on P4001. Section 5.2.6 defines the lighting config pages but does not dicsriminate between the Hi and Lo buses. Assuming the Hi bus is connected to a 14V dimmer cct, what is Lighting Bus Lo used for?
cheers,
Ron
187 finishing
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[quote][b]
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ron.mcgann(at)baesystems.
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| Posted: Mon Apr 16, 2007 3:34 am Post subject: GNS 430 wiring (was Everybody doing taxes?) |
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Thanks Indran. I guess I am a little surprised that the Lighting Bus Lo is another ground connection. There are already two aircraft ground pins on P4001. I didn't see anything in the lighting description to indicate the lighting bus accommodates a negative voltage. I could find no description of Lighting Bus Lo at all. But it sounds like I could just use the photocell rather than a dimmer.
Mine looks like an aeroplane as well, but I know I have loooong way to go.
cheers
Ron
BTW - thanks for reminding me about my BAS!!!
--
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ScooterF15
Joined: 19 Jun 2006
Posts: 136
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| Posted: Mon Apr 16, 2007 6:55 pm Post subject: GNS 430 wiring (was Everybody doing taxes?) |
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Ron,
I believe Hi / Lo is avionics talk for positive / negative.
Jim
40134
In a message dated 4/16/2007 12:53:34 A.M. Eastern Daylight Time, ron.mcgann(at)baesystems.com writes:
| Quote: | With all the tax prep being done, hopefully someone can help me with a simple question.
Section 4.2.2.2 of the GNS430 installation manual refers to Lighting Bus Hi and Lighting Bus Lo connections on P4001. Section 5.2.6 defines the lighting config pages but does not dicsriminate between the Hi and Lo buses. Assuming the Hi bus is connected to a 14V dimmer cct, what is Lighting Bus Lo used for?
cheers,
Ron
187 finishing
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Jim "Scooter" McGrew
http://www.mit.edu/~jsmcgrew
See what's free at AOL.com.
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