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Low voltage problem in a new plane- New readings

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lgold(at)quantum-associat
Guest

Posted: Sun Dec 30, 2007 10:24 pm Post subject: Low voltage problem in a new plane- New readings

Bob,



I took some added measurements regarding the possible voltage drop problem

(see earlier email, below) but the results are not consistent. I setup the

Dynon 180 to see buss voltage and current draw.  When I started up the

engine with a fully charged battery the over/under voltage (o/v) light,

which is triggered at 12.5V, did not come on although Dynon was saying the

buss was only at 11.8 volts. I flew around for 15-minutes while drawing

between 2 and 4 amps from an ICOM portable VHF and the Dynon. Then I put on

some current hogs like the 50-watt landing light and the strobes. The Dynon

reading dropped to 11.6 volts and the o/v light finally did come on at cruse

RPM. I was drawing about 8-amps at the time according to Dynon. I turned off

the high-draw stuff and the o/v light went off. After flying around for

about 30-minutes I landed. On the ground, even when running up at 4300-RPM

(cruse RPM is 5000) the o/v light came on and stayed on even with minimal

current draw. I turned off the engine and found the voltage across the

battery, measured with a voltmeter, to be 12.8V, which dropped to 12.6V

after turning on the Dynon, which was now reading 11.6V.



Based upon what you told me plus some speculation I am guessing that the

Dynon voltage reading is not correct and should be ignored  I also guess

that the battery did not discharge in flight and the voltage regulator was

pumping juice into it as it should be since the battery was at 12.8V when

measured after the flight.



I plan to ignore the light and keep flying. Even if the battery discharges

the ignition should still work (I think it has its own generator) and both

the Dynon and the ICOM radio have internal batteries that will keep going

for an hour or more.  



Is the ultimate solution to just stop displaying the Dynon voltage and to

use a much lower intensity, less annoying o/v light?



Thanks again for your help, and have a great New Year.

Les 



[quote] --

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glastar(at)gmx.net
Guest

Posted: Mon Dec 31, 2007 1:06 am Post subject: Low voltage problem in a new plane- New readings

Les,



the 1V drop looks like you have the Dynon hooked up behind a diode (1V 

voltage drop) do you have somewhere a electrical drawing of your system?



However, when we take into account the 1V drop you would have only 12.8V 

charging on your system, which is a bit low so I would suggest you look 

at your regulator probably the set point is to (should be between 13.8 

and 14.2).



br



Werner



Les Goldner wrote:

[quote] 



 Bob,



 I took some added measurements regarding the possible voltage drop problem

 (see earlier email, below) but the results are not consistent. I setup the

 Dynon 180 to see buss voltage and current draw.  When I started up the

 engine with a fully charged battery the over/under voltage (o/v) light,

 which is triggered at 12.5V, did not come on although Dynon was saying the

 buss was only at 11.8 volts. I flew around for 15-minutes while drawing

 between 2 and 4 amps from an ICOM portable VHF and the Dynon. Then I put on

 some current hogs like the 50-watt landing light and the strobes. The Dynon

 reading dropped to 11.6 volts and the o/v light finally did come on at cruse

 RPM. I was drawing about 8-amps at the time according to Dynon. I turned off

 the high-draw stuff and the o/v light went off. After flying around for

 about 30-minutes I landed. On the ground, even when running up at 4300-RPM

 (cruse RPM is 5000) the o/v light came on and stayed on even with minimal

 current draw. I turned off the engine and found the voltage across the

 battery, measured with a voltmeter, to be 12.8V, which dropped to 12.6V

 after turning on the Dynon, which was now reading 11.6V.



 Based upon what you told me plus some speculation I am guessing that the

 Dynon voltage reading is not correct and should be ignored  I also guess

 that the battery did not discharge in flight and the voltage regulator was

 pumping juice into it as it should be since the battery was at 12.8V when

 measured after the flight.



 I plan to ignore the light and keep flying. Even if the battery discharges

 the ignition should still work (I think it has its own generator) and both

 the Dynon and the ICOM radio have internal batteries that will keep going

 for an hour or more.  



 Is the ultimate solution to just stop displaying the Dynon voltage and to

 use a much lower intensity, less annoying o/v light?



 Thanks again for your help, and have a great New Year.

 Les 



   

> --

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jindoguy(at)gmail.com
Guest

Posted: Mon Dec 31, 2007 7:03 am Post subject: Low voltage problem in a new plane- New readings

Les, Wouldn't the ultimate solution be to pull the Dynon and get it serviced to make sure it's all right? You paid for all the features of the unit, why not get them tested and or repaired so you really know what's going on? 

Rick

On Dec 31, 2007 3:03 AM, Werner Schneider <glastar(at)gmx.net (glastar(at)gmx.net)> wrote:

[quote] --> AeroElectric-List message posted by: Werner Schneider <glastar(at)gmx.net (glastar(at)gmx.net)>

Les,

the 1V drop looks like you have the Dynon hooked up behind a diode (1V

voltage drop) do you have somewhere a electrical drawing of your system? 

However, when we take into account the 1V drop you would have only 12.8V

charging on your system, which is a bit low so I would suggest you look

at your regulator probably the set point is to (should be between  13.8

and 14.2).

br

Werner

Les Goldner wrote:

 	  Quote: 	
		   --> AeroElectric-List message posted by: "Les Goldner" < lgold(at)quantum-associates.com (lgold(at)quantum-associates.com)>

 Bob,

 I took some added measurements regarding the possible voltage drop problem

 (see earlier email, below) but the results are not consistent. I setup the 

 Dynon 180 to see buss voltage and current draw.  When I started up the

 engine with a fully charged battery the over/under voltage (o/v) light,

 which is triggered at 12.5V, did not come on although Dynon was saying the 

 buss was only at 11.8 volts. I flew around for 15-minutes while drawing

 between 2 and 4 amps from an ICOM portable VHF and the Dynon. Then I put on

 some current hogs like the 50-watt landing light and the strobes. The Dynon 

 reading dropped to 11.6 volts and the o/v light finally did come on at cruse

 RPM. I was drawing about 8-amps at the time according to Dynon. I turned off

 the high-draw stuff and the o/v light went off. After flying around for 

 about 30-minutes I landed. On the ground, even when running up at 4300-RPM

 (cruse RPM is 5000) the o/v light came on and stayed on even with minimal

 current draw. I turned off the engine and found the voltage across the 

 battery, measured with a voltmeter, to be 12.8V, which dropped to 12.6V

 after turning on the Dynon, which was now reading 11.6V.

 Based upon what you told me plus some speculation I am guessing that the 

 Dynon voltage reading is not correct and should be ignored  I also guess

 that the battery did not discharge in flight and the voltage regulator was

 pumping juice into it as it should be since the battery was at  12.8V when

 measured after the flight.

 I plan to ignore the light and keep flying. Even if the battery discharges

 the ignition should still work (I think it has its own generator) and both

 > the Dynon and the ICOM radio have internal batteries that will keep going

[quote] for an hour or more.

 Is the ultimate solution to just stop displaying the Dynon voltage and to

 use a much lower intensity, less annoying o/v light? 

 Thanks again for your help, and have a great New Year.

 Les

> --

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