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Electric Gurus Needed


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#1 ducky OFFLINE  

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Posted September 03, 2016 - 06:25 AM

  We are getting ready for corn silage up here and I need to light the side of the 40 foot silage trailer so we can tell when the tarp down at night.

I think this will work.  Add 2 diodes (1N5817), one to each terminal of the reversible tarp motor and join them to the LED spot light.  See Drawing. 

Image-0001.jpeg


Edited by ducky, September 03, 2016 - 06:26 AM.


#2 MH81 ONLINE  

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Posted September 03, 2016 - 07:05 AM

Not a GURU, but I will mention what I see.
One diode is backwards. You will have to test for polarity at the motor to decid which one.
And we will need to know voltage supplied to motor, assuming dc, and the specs for the light.

BTW, This light will only light while the motor is running.



Ok, I just did a cross ref on that diode. It is coming up as a 25a Schottky Barrier Diode.
http://www.nteinc.co.../pdf/nte585.pdf. What's the voltage at the motor?
How much current is this light going to pull? If much, then we are looking at the feed circuit for capacity and more.
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#3 ol' stonebreaker ONLINE  

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Posted September 03, 2016 - 08:37 AM

  Can't say for sure but aren't LED's polarity sensitive? Doesn't the tarp have to have polarity reversed to change direction?

   Edit: OK, I see the purpose of the diodes.

                                        Mike


Edited by ol' stonebreaker, September 03, 2016 - 08:39 AM.

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#4 chieffan ONLINE  

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Posted September 03, 2016 - 09:03 AM

Wouldn't be simpler to put the light on a on/off switch in the cab and can turn it on when ever you want?  Weather proof plug at the trailer/cab connection.  As was stated with your set up the light would only come on when the motor was activated.


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#5 ducky OFFLINE  

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Posted September 03, 2016 - 11:13 AM

 12 Volt system.

I really do not want to run more wires from the tractor to the trailer.  Just more to go wrong or get ripped off.

The light will be mounted within a foot of the motor so not much wiring this way.  I would like the LED on in both direction.

 

The polarity on the motor is reversed to change rotation by a pair of relays on the tractor.  The LED is polarity sensitive but if I just run a wire from each motor terminal to the LED + side it will short the 2 motor terminal.  That is the reason for the Diodes.

 

Sorry for the poor explanation in my first post.



#6 HDWildBill OFFLINE  

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Posted September 03, 2016 - 12:13 PM

 12 Volt system.

I really do not want to run more wires from the tractor to the trailer.  Just more to go wrong or get ripped off.

The light will be mounted within a foot of the motor so not much wiring this way.  I would like the LED on in both direction.

 

The polarity on the motor is reversed to change rotation by a pair of relays on the tractor.  The LED is polarity sensitive but if I just run a wire from each motor terminal to the LED + side it will short the 2 motor terminal.  That is the reason for the Diodes.

 

Sorry for the poor explanation in my first post.

 

I know you said you didn't want to run extra wiring but it would seem to me that it would be simpler if you had a separate relay for the light and then when either of the motor relay's were energized it would energize the light relay as well then the polarity issue is resolved and any T/S would be simplier.


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#7 DH1 OFFLINE  

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Posted September 03, 2016 - 02:59 PM

It will work, diodes act as 1 way valves, the light will come on when the motor is running either direction.


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#8 ducky OFFLINE  

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Posted September 03, 2016 - 07:53 PM

It will work, diodes act as 1 way valves, the light will come on when the motor is running either direction.

Thanks, I was pretty sure I was on the right track.  My main concern was the EMF from the motor causing an issue that would cause the diodes to fail.



#9 MH81 ONLINE  

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Posted September 03, 2016 - 08:35 PM

I thought you wanted it to be an idiot light or something.

Yes, if it's to be on both directions, that'll work.
Now... why the 25a diode? How much current does this LED light pull?
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#10 ducky OFFLINE  

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Posted September 03, 2016 - 09:22 PM

Now... why the 25a diode? How much current does this LED light pull? 
Thanks Alan

 

The (1N5817) is actually a 1 amp. diode and has a 20 volt forward bias.  The LED is 18 Watts which is about 1.5 amps.

I will have to up the capacity of the diode a bit.



#11 MH81 ONLINE  

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Posted September 03, 2016 - 09:41 PM

Teach me to speed read.
The 1N5817 has a 25 amp SURGE current.

:wallbanging:

Sorry Ducky
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#12 ducky OFFLINE  

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Posted September 04, 2016 - 07:32 PM

Here is what I made and it seems to work.

IMAG0944.jpg

Touch either of the eyelet to B+ and the light turns on.

Thanks all for the help.


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