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Voltage Drop / amp ?????

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fstringham

Joined: 10 Jan 2006
Posts: 87

Posted: Thu Jul 23, 2009 9:38 am Post subject: Voltage Drop / amp ?????

I have wired my RV7A with the 13/8 revision L. I did modify it to include the LR3C Alternator controller in place of genric Ford Regulator and the AEC9005-101 Low Voltage Module. In looking at the 13/8 revision Q there is an addition of a S704-1 / diode combo added to the Main Battery Bus / Endurance Bus / Endurance Bus Switch. I also have noted that a AEC9001 Schottky Diode can be used in place of a bridge diode. 

  

 As I notded in a previous email. 1. When the master switch is closed the voltage showes around 10.8 volts with rock solid amps indication on the Dynon D-120 EMS. When the endurance switch is closed the Voltage moves up to 12.8 or 12.9 and the amps meter begins to fluctuate. Open the Master Switch thus having the load go to only the endurance bus side the voltage maintains at 12.8 to 12.9 volts and the amps still fluctuates. This situation happens with or with out the engine running. The battery maintains charge. 

  

 Since I sent the last email I have learned that the bridge diode will cause a drop in voltage. (Even this 62 year old guy can learn stuff....)  C but I would have though it would cause the endurance voltage to be less on the endurance bus side not the main bus side with the master switch closed.???????

  

 Now the questions. 1. Why the addition of the S204-1 / diode combo added at the endurance bus switch and will it be of value in my configuration to added it. 2. Would it be of value to added the Schottly in place of the bridge diode. I would think yes if the voltage drop is less and thus give a more accurate voltage reading. 3. Why the higher voltage drop on the Main Bus as compared to the Endurance Bus? 4. Whay the conflicting amp reading between the Main vs Endurance Bus.

  

 Thanks in advance for any help in this matter

  

 Frank (at) 1L8 ...RV7A... Phase 1 underway

  

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jul 24, 2009 7:01 am Post subject: Voltage Drop / amp ?????

I have wired my RV7A with the 13/8 revision L. I did modify it to 

include the LR3C

Alternator controller in place of genric Ford Regulator and the AEC9005-101 Low

Voltage Module. In looking at the 13/8 revision Q there is an 

addition of a S704-1 /

diode combo added to the Main Battery Bus / Endurance Bus / Endurance 

Bus Switch.

I also have noted that a AEC9001 Schottky Diode can be used in place 

of a bridge diode.



As I noted in a previous email. 1. When the master switch is closed the voltage

shoes around 10.8 volts with rock solid amps indication on the Dynon D-120 EMS.



   From this I deduce that your Dynon is measuring the e-bus voltage.

   Indeed, with master switch ON and alternator not running, the main

   bus would normally be a about 12.5 volts. An expected 0.7 volt drop

   in normal feed diode produces an e-bus voltage on the order of

   11.8 volts.



When the endurance switch is closed the Voltage moves up to 12.8 or 12.9 and

the amps meter begins to fluctuate. Open the Master Switch thus having the

load go to only the endurance bus side the voltage maintains at 12.8 

to 12.9 volts

and the amps still fluctuates.



   Okay, with the alternator OFF the battery-only voltage would

   be expected to fall in this range. When you say the amps

   "fluctuates" what's the max-min numbers displayed?



This situation happens with or without the engine running. The 

battery maintains charge.



   With the engine running, do you turn the alternator ON to

   see if it elevates the bus to the nominal 14.2 to 14.6 volts?



Since I sent the last email I have learned that the bridge diode will

cause a drop in voltage. (Even this 62 year old guy can learn stuff....),

but I would have though it would cause the endurance voltage to be

less on the endurance bus side not the main bus side with the master

switch closed.???????



   Then the Dynon is NOT monitoring the e-bus? If you close the

   e-bus alternate feed switch and the Dynon display goes UP,

   then it appears that the Dynon is on the e-bus.



Now the questions. 1. Why the addition of the S204-1/diode combo added at

the endurance bus switch and will it be of value in my configuration to added

it?



   Don't know what an S204-1 device is . . . and don't know why

   ANY diode would be wired to the e-bus alternate feed switch.



2. Would it be of value to added the Schottly in place of the bridge diode?



    Slightly . . . but from the readings you cite it's not clear

    that the Dynon is connected to the Main bus . . . hence SOME

    degree of bus votlage suppression would be expected.



I would think yes if the voltage drop is less and thus give a more accurate

voltage reading.



    The voltmeter is already ACCURATE. It's showing the votlage

    at where ever it's attached. I'm guessing the e-bus. So all other

    things being normal and functioning to design goals, the readings

    are expected and normal.



  3. Why the higher voltage drop on the Main Bus as compared to the

  Endurance Bus?



    With engine not running and alternator OFF . . .



    Get out a voltmeter and connect the (-) lead to the battery (-)

    or to airframe ground. With master switch ON, E-bus alternate

    feed switch OFF, measure and record main and e-bus voltages.

    Turn E-Bus alternate feed switch ON and repeat the measurements.

    Leave B-Bus switch ON turn master switch OFF and repeat the

    measurements.



    With engine running and alternator ON . . .



    With master switch ON, E-bus alternate feed switch OFF,

    measure and record main and e-bus voltages. Turn E-Bus alternate

    feed switch ON and repeat the measurements. Leave B-Bus switch

    ON turn master switch OFF and repeat the measurements.



  4. Why the conflicting amp reading between the Main vs Endurance Bus.



   I don't know WHAT your amp reading means nor how big the

   fluctuations are. These are digital instruments with quantitization

   errors that may well display some tiny wobble in readings even when

   the actual value is steady. Are the strobes running? This would

   cause an explain a jumpy ammeter reading.



Thanks in advance for any help in this matter



   We need DATA under various configurations in order to deduce

   the whether the system is wired as designed and whether or

   not the components are functioning as expected.



   Bob . . .

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fstringham

Joined: 10 Jan 2006
Posts: 87

Posted: Fri Jul 24, 2009 8:18 am Post subject: Voltage Drop / amp ?????

Thanks Bob for the info. My next trip to the airport will begin the process of trouble shooting as you suggest.

  

 In regards to this part of the email I made a typo..

  

 Now the questions. 1. Why the addition of the S204-1/diode combo( should have been S704-1 / diode combo) added at

the endurance bus switch and will it be of value in my configuration to add

it?

 

Don't know what an S204-1 device is . . . and don't know why

ANY diode would be wired to the e-bus alternate feed switch.



 

 

 	  Quote: 	
		   Date: Thu C 23 Jul 2009 13:39:00 -0500

 To: aeroelectric-list(at)matronics.com

 From: nuckolls.bob(at)aeroelectric.com

 Subject: RE: Voltage Drop / amp ?????

 

 --> AeroElectric-List message posted by: "Robert L. Nuckolls C III" <nuckolls.bob(at)aeroelectric.com>

 

 I have wired my RV7A with the 13/8 revision L. I did modify it to 

 include the LR3C

 Alternator controller in place of genric Ford Regulator and the AEC9005-101 Low

 Voltage Module. In looking at the 13/8 revision Q there is an 

 addition of a S704-1 /

 diode combo added to the Main Battery Bus / Endurance Bus / Endurance 

 Bus Switch.

 I also have noted that a AEC9001 Schottky Diode can be used in place 

 of a bridge diode.

 

 As I noted in a previous email. 1. When the master switch is closed the voltage

 shoes around 10.8 volts with rock solid amps indication on the Dynon D-120 EMS.

 

 From this I deduce that your Dynon is measuring the e-bus voltage.

 Indeed C with master switch ON and alternator not running C the main

 bus would normally be a about 12.5 volts. An expected 0.7 volt drop

 in normal feed diode produces an e-bus voltage on the order of

 11.8 volts.

 

 When the endurance switch is closed the Voltage moves up to 12.8 or 12.9 and

 the amps meter begins to fluctuate. Open the Master Switch thus having the

 load go to only the endurance bus side the voltage maintains at 12.8 

 to 12.9 volts

 and the amps still fluctuates.

 

 Okay C with the alternator OFF the battery-only voltage would

 be expected to fall in this range. When you say the amps

 "fluctuates" what's the max-min numbers displayed?

 

 This situation happens with or without the engine running. The 

 battery maintains charge.

 

 With the engine running C do you turn the alternator ON to

 see if it elevates the bus to the nominal 14.2 to 14.6 volts?

 

 Since I sent the last email I have learned that the bridge diode will

 cause a drop in voltage. (Even this 62 year old guy can learn stuff...) C

 but I would have though it would cause the endurance voltage to be

 less on the endurance bus side not the main bus side with the master

 switch closed.???????

 

 Then the Dynon is NOT monitoring the e-bus? If you close the

 e-bus alternate feed switch and the Dynon display goes UP C

 then it appears that the Dynon is on the e-bus.

 

 Now the questions. 1. Why the addition of the S204-1/diode combo added at

 the endurance bus switch and will it be of value in my configuration to added

 it?

 

 Don't know what an S204-1 device is . . . and don't know why

 ANY diode would be wired to the e-bus alternate feed switch.

 

 2. Would it be of value to added the Schottly in place of the bridge diode?

 

 Slightly . . . but from the readings you cite it's not clear

 that the Dynon is connected to the Main bus . . . hence SOME

 degree of bus votlage suppression would be expected.

 

 I would think yes if the voltage drop is less and thus give a more accurate

 voltage reading.

 

 The voltmeter is already ACCURATE. It's showing the votlage

 at where ever it's attached. I'm guessing the e-bus. So all other

 things being normal and functioning to design goals C the readings

 are expected and normal.

 

 3. Why the higher voltage drop on the Main Bus as compared to the

 Endurance Bus?

 

 With engine not running and alternator OFF . . .

 

 Get out a voltmeter and connect the (-) lead to the battery (-)

 or to airframe ground. With master switch ON C E-bus alternate

 feed switch OFF C measure and record main and e-bus voltages.

 Turn E-Bus alternate feed switch ON and repeat the measurements.

 Leave B-Bus switch ON turn master switch OFF and repeat the

 measurements.

 

 With engine running and alternator ON . . .

 

 With master switch ON C E-bus alternate feed switch OFF C

 measure and record main and e-bus voltages. Turn E-Bus alternate

 feed switch ON and repeat the measurements. Leave B-Bus switch

 ON turn master switch OFF and repeat the measurements.

 

 4. Why the conflicting amp reading between the Main vs Endurance Bus.

 

 I don't know WHAT your amp reading means nor how big the

 fluctuations are. These are digital instruments with quantitization

 errors that may well display some tiny wobble in readings even when

 the actual value is steady. Are the strobes running? This would

 cause an explain a jumpy ammeter reading.

 

 Thanks in advance for any help in this matter

 

 We need DATA under various configurations in order to deduce

 the whether the system is wired as designed and whether or

 not the components are functioning as expected.

 

&gt
	


[quote] 

 

 

Windows Live™ Hotmail®: Search C add C and share the web’s latest sports videos. Check it out.   	  Quote: 	
		  [b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jul 24, 2009 9:31 am Post subject: Voltage Drop / amp ?????

At 10:51 AM 7/24/2009, you wrote:

  	  Quote: 	
		  Thanks Bob for the info. My next trip to the airport will begin the process of trouble shooting as you suggest.

  

 In regards to this part of the email I made a typo..

  

 Now the questions. 1. Why the addition of the S204-1/diode combo( should have been S704-1 / diode combo) added at

 the endurance bus switch and will it be of value in my configuration to add

 it? 	




    Okay. The normal e-bus feed path diode shown on Figure

    Z-11 . . .



  http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z11M.pdf

 

 

    shows an isolation diode between the main bus and

    the endurance bus. The purpose of this device is

    to PREVENT the main bus from being powered up

    from the E-bus during battery-only operations.



    If you're subscribing to the design goals described

    for the endurance bus, then this diode is necessary.

    Do I deduce correctly that this diode is not presently

    a part of your current configuration?



 

 

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------



     [quote][b]

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jimysymonds

Joined: 03 Sep 2009
Posts: 3

Posted: Thu Sep 03, 2009 10:06 pm Post subject: Re: Voltage Drop / amp ?????

You can play around with the others but if you want to work, the shoes has to be your choice. 

Did you find this review helpful?

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_________________
Size 12 shoes

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