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Single EPL101x Series Dimmer For Dynon Skyview Brightness a

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billhuntersemail(at)gmail
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Posted: Sun Feb 05, 2017 4:56 pm Post subject: Single EPL101x Series Dimmer For Dynon Skyview Brightness a

Charlie and Joe,



As always I am very grateful for your help.



So the "DIM OUTPUT" signal is essentially a "variable ground" (I think they could have called it something different than "output"...just say 'in).



The Skyview manual states that the DIM OUTPUT "can sink a maximum current of 120mA and a maximum voltage of 40V."  So for my landing light circuit simply branch off one extra wire from the same spade as the circuit that goes to the landing light (+) and run this second wire to the (+) spade of the switch indicator light? 



I just received this from the dimmer manufacturer:  "To clarify, the EPL1012 is a pulse width modulated power switch and not a rheostat.  The switching takes place between the red wire and the black wire.  The white wire supplies power to the switching circuit at around 300 Hz. Please note that there is no current limiting within the dimmer."



Since the dimmer is essentially a variable voltage digital signal I am curious to see if it would work for the pin 25.  I am hoping against hope because I already cut the hole in my panel for the dimmer...and I really like the looks of the little knob.  I will ask Dynon.



THANKS AGAIN!!!!

.



Cheers!!!



Bill  Hunter



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user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Sun Feb 05, 2017 8:08 pm Post subject: Re: Single EPL101x Series Dimmer For Dynon Skyview Brightnes

It seems that the EPL1012 and the SkyView work the same.  They both pulse the negative supply.  Connecting the EPL1012 directly to the SkyView DIM INPUT (Pin 25) is unlikely to work.  But it might be possible to connect resistors and a capacitor between the output of the EPL1012 and pin 25 of the SkyView to smooth out the pulses.

  It would be a whole lot easier to use a potentiometer instead of the EPL1012 .  Maybe one can be found to fit the hole that you drilled.  What size hole is it?

POTS are available with 3/8" Bushing.

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Joe Gores

user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Mon Feb 06, 2017 5:38 am Post subject: Re: Single EPL101x Series Dimmer For Dynon Skyview Brightnes

If the hole in the panel is too big for a POT, glue or rivet a reducing washer to the other side of the panel.  Mount a 10K pot and put the knob from the EPL1012 on the pot shaft.  Connect the pot center wiper to SkyView pin 25.  Connect 12 volts across the other two pot terminals.

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Joe Gores

billhuntersemail(at)gmail
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Posted: Tue Feb 07, 2017 10:14 am Post subject: Single EPL101x Series Dimmer For Dynon Skyview Brightness a

I know that everyone has been waiting in major suspense for this...



(SPOILER ALERT)



I just got my response from Dynon...the ELP101x PWM dimmer will NOT work for

the Skyview remote dimmer function through pin 25.  !!!DANG!!!



Pin 25 needs to see a regular, old, boring 0 to 14 VDC signal.



Should I use a rheostat or potentiometer for this signal?



For either device, I need to tap off of an always hot, protected 14 VDC

wire.  



I am considering tapping off of the wire that provides the power feed to the

Dynon because if I used another source (such as a landing light feed wire)

and should that devices CB pop then I do not have the dimmer control of the

Dynon and if the pin 25 sees 0 VDC then it will go to minimum brightness.

That could be bad...



Is tapping off of the Dynon power feed what you all would recommend?

Naturally there is a load associated with the variable resistance of the

rheostat/potentiometer however I am not able to calculate that load. The

Dynon CB is only 5 AMPS. 



I do not think it necessary to run a completely different CB for this dimmer

circuit...or do I?!?!?   



If I install a potentiometer, I think I will need to run that feed wire to

lug #3 of a potentiometer and then connect lug #1 to ground.  The center lug

(wiper) will go to pin 25.  Is the electrical path of my thinking correct?



THANKS AGAIN!!!

.



Cheers!!!



Bill  Hunter



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edpav8r(at)yahoo.com
Guest

Posted: Tue Feb 07, 2017 12:06 pm Post subject: Single EPL101x Series Dimmer For Dynon Skyview Brightness a

Bill,

Pin 25 will almost certainly be an input to either an op-amp buffer or an analog-to-digital converter.  This means there will be virtually no current flow into Pin 25; it merely "senses" the voltage present.  This being the case, you can use any common potentiometer of 10k ohm or greater to produce the 0-14V signal, and current through the pot would be 1.4 milliamps (0.0014 amps) maximum.  The exact value of the pot makes no difference; its mechanical dimensions will be most important to you.

Connect one end of the pot to 14V (the Dynon's supply voltage is fine), the opposite end to ground, and the middle (wiper) to Pin 25.  If you find that the pot works backwards, just swap the 14V and ground connections on the pot.

The mechanical drawing of the ELP1012 dimmer...

http://www.pcarv.com/images/Dimmer/EPL1012%20Mechanical%20Drawing.jpg

...seems to indicate two possible mounting hole sizes: 0.265" or 0.375".  What size hole do you have in your panel?  If you'll reply with that, we can help you find a potentiometer that will work, and fit your hole.

Eric



On Feb 7, 2017, at 10:11 AM, William Hunter <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)> wrote:

[quote]--> AeroElectric-List message posted by: "William Hunter" <billhuntersemail(at)gmail.com (billhuntersemail(at)gmail.com)>



I know that everyone has been waiting in major suspense for this...



(SPOILER ALERT)



I just got my response from Dynon...the ELP101x PWM dimmer will NOT work for

the Skyview remote dimmer function through pin 25.  !!!DANG!!!



Pin 25 needs to see a regular, old, boring 0 to 14 VDC signal.



Should I use a rheostat or potentiometer for this signal?



For either device, I need to tap off of an always hot, protected 14 VDC

wire.  



I am considering tapping off of the wire that provides the power feed to the

Dynon because if I used another source (such as a landing light feed wire)

and should that devices CB pop then I do not have the dimmer control of the

Dynon and if the pin 25 sees 0 VDC then it will go to minimum brightness.

That could be bad...



Is tapping off of the Dynon power feed what you all would recommend?

Naturally there is a load associated with the variable resistance of the

rheostat/potentiometer however I am not able to calculate that load. The

Dynon CB is only 5 AMPS. 



I do not think it necessary to run a completely different CB for this dimmer

circuit...or do I?!?!?   



If I install a potentiometer, I think I will need to run that feed wire to

lug #3 of a potentiometer and then connect lug #1 to ground.  The center lug

(wiper) will go to pin 25.  Is the electrical path of my thinking correct?



THANKS AGAIN!!!

..



Cheers!!!



Bill  Hunter



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user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Tue Feb 07, 2017 12:25 pm Post subject: Re: Single EPL101x Series Dimmer For Dynon Skyview Brightnes

Bill, your reasoning is correct.  But do NOT use a rheostat because it has low resistance and will draw too much current.  Use a 5K or 10K POT or whatever Dynon recommends.  The pot will only draw a couple of milliamps.  You could get 12 volts from SV-EMS-220 pin 15 or any convenient place.  Pin 15 probably has internal over-current protection.  The SkyView fuse can be increased in size from 5 to 7.5 amps, not because of the pot, but because a 5 amp fuse can blow under certain conditions.  A friend of mine was on a long cross country when his SkyView display went dark because the 5 amp fuse blew.  He replaced the fuse in flight, and the replacement fuse also blew.  Luckily it was a daytime VFR flight.  The reason the fuse blew was that, prior to the flight, he had been running the SkyView from its backup battery and ran it down.  While on the cross country flight, the SkyView was drawing maximum current to both operate the EFIS and to charge the backup battery.  He called Dynon because he thought the SkyView was defective.  They recommended that he power the SkyView through a 7.5 amp fuse.  He did and no more problems.  If your plane has circuit breakers, not fuses, a 5 amp breaker will probably be adequate because circuit breakers are slower to trip than fuses.

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Joe Gores

billhuntersemail(at)gmail
Guest

Posted: Wed Feb 08, 2017 6:02 pm Post subject: Single EPL101x Series Dimmer For Dynon Skyview Brightness a

Joe,



THANKS...this is very good information!!!



 	  Quote: 	
		   But do NOT use a rheostat because it has low resistance and will draw too

much current.  Use a 5K or 10K POT or whatever Dynon recommends.  
	




I have one on order...now.  Dynon has a nice looking knob.



 	  Quote: 	
		  The SkyView fuse can be increased in size from 5 to 7.5 amps, not because

of the pot, but because a 5 amp fuse can blow under certain conditions.  A
	


friend of mine was on a long cross country when his SkyView display went

dark because the 5 amp fuse blew.  



 	  Quote: 	
		   If your plane has circuit breakers, not fuses, a 5 amp breaker will

probably be adequate because circuit breakers are slower to trip than fuses.
	




Is your friend running two fuses for the power supply for the Dynon SV?  



I read that the system is designed for two power source wires and ground

wires because the max load that the D-Sub pin can handle is only about 4

amps so they ran two power wires.  I am running two 5 amp circuit breakers.

I have not powered up the system...hopefully it will not let any smoke out

of the wires.



Page 4-9

Power Input

SkyView displays have a primary power input that is compatible with 12 volt

and 24 volt 

systems (10 to 30 volts DC). There are two unterminated solid red primary

power input wires

(to reduce current loading in each wire-these are not for redundancy and

both must be 

connected to the same power source) and two unterminated solid black primary

ground wires.

Page 1-7

Power Consumption

Table 2 contains SkyView displays and devices that are powered by SkyView

displays. 5A circuit 

protection is recommended for SkyView displays in common configurations; 5A

is the smallest 

circuit breaker that is commonly available in certified versions.

.



Cheers!!!



Bill  Hunter



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user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Wed Feb 08, 2017 7:21 pm Post subject: Re: Single EPL101x Series Dimmer For Dynon Skyview Brightnes

No, my friend's SkyView is powered by only one fuse.

And you should only use ONE circuit breaker.

The SkyView manual states, "same power source".  That means one breaker or fuse.  But connect 2 wires to the one breaker to power the SkyView.

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