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Quick question about Led Wiz wiring


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#1 SteveTheGeek

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Posted 24 April 2014 - 03:13 PM

Hi !

 

  I’m going to install my new Led Wiz soon and have a question…

 

  I am only going to run leds, most of them connected on 5V (rgb leds - a lightbar from ZebBoards).

 

  I have only one output (for the strobes) that will be connected to 12V.

 

  I understand I must isolate the 12V to it’s own 8 output bank and use the 24 remaining outputs for the leds.

 

 I also understand that because it’s only leds, I should not need to connect the + to the Bank Voltage Select connectors.

 

 Is this last statement also true if I use two different voltages like in this case ? Or because of that I need to bring +5V to the bank selector for the 3 banks driving leds and +12V to the bank selector for the bank driving the strobes ?

 

Thanks for the help !!!

 

Steve



#2 vampirolatino2

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Posted 24 April 2014 - 03:48 PM

Well ... by instructions of the LedWiz .... you can have each port with his own power. I want to do the same, my RGB Flippers are 5V and others pheriperals in that same bank are 12V ... So I think I will have to NOT use the "All Voltage Bank to a V+" and power each one individually?

 

I mean from bank 1 to 16 are all 12V for the RGB + Stoobe bars, from bank 17 to 24 are the one that need to be powered differently, like this: http://forum.arcadec...?topic=130635.0 because there will be (motor 12v, shaker 12v, knocker 12vv, rgb 5v) .. so I can't use the bank accumulator to power all to the same source.

But the last bank 25 to 32 will be 24V for the solenoids

 

I may do a little sketch and post it later.



#3 SteveTheGeek

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Posted 24 April 2014 - 07:12 PM

Hi !

 

  I read the opposite in the doc : 

 

" The positive power line must be connected to any other part of the LED-Wiz board, and all devices attached to any bank of outputs must share the same voltage requirements."
 
 So one voltage per bank no ?
 
Steve


#4 vampirolatino2

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Posted 24 April 2014 - 08:07 PM

http://groovygamegea...Zv2_INSTALL.pdf

 

like the figure at the end. But in my case i want to use different voltages in each port of one bank (driver chip), from text: "The output drivers used with the LED-WIZ™are technically capable of handling a maximum of 50vDC at 500ma per single output, with the total current on any bank (driver chip) not exceeding 1 amp (in a short pulse) at any given time."

 

Mmmm ... this rise a question, If this is true, why everyone connect their RGBs all in the same chip? Doesn't it use more than 1A? i mean, if 1 led from the RGB use 350mA ... it can only flash 2 bulbs at a time right (700mA) ... 3 will use over 1A....?


Do I am overthinking everything .. like always... lol :tapping:


Edited by vampirolatino2, 24 April 2014 - 08:07 PM.


#5 SteveTheGeek

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Posted 25 April 2014 - 11:43 AM

Seems you were right about the different voltages !

 

Here's an answer from Groovy Game Gear : 

 

It really depends on the length of the wires being attached.  If using
long wires, and higher currents, there's the possibility of building
capacitance in the wiring, which could discharge back into the driver as
the field collapses.  If that's the case, it would be a good idea to use
the Bank Voltage Select connections, as these go to internal snubbing
diodes.
 
Technically, if the + voltages driving your connected devices, never
come into contact with the LED-Wiz (i.e. BVS terminals are not used) it
should be possible to mix voltages on the same driver chip.  We usually
recommend not doing so, just to make it a bit less likely to cause a
problem due to user error.


#6 zebulon

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Posted 25 April 2014 - 06:10 PM

If you have diodes connected externally to the load (output device) then it is completely fine to control different voltages by the same bank. The internal diodes in the uln driver chip are effective to a degree, but the best protection still remains an externally mounted diode such as the 1N4007 (1A@100v flyback protection).

 

The output of the ledwiz is 0v (otherwise referred to as common or ground, ground not being completely correct but generally better understood). As long as all of the 0v lines from your various power supplies and the 0v line of the ledwiz are connected to a common point, the voltage will sort itself out as to where the best draw should originate from (shortest path to ground or path of least resistance).

 

As always, the max load per output is 500ma and a total draw per driver chip of 2.5w


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#7 SteveTheGeek

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Posted 25 April 2014 - 06:17 PM

Thanks Zeb !