Chief Delphi - LEDs connected to Solenoid Breakout. It's illegal, but why?

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- - LEDs connected to Solenoid Breakout. It's illegal, but why? (http://www.chiefdelphi.com/forums/showthread.php?t=92558)

billbo911

01-02-2012 14:33

Re: LEDs connected to Solenoid Breakout. It's illegal, but why?

Quote:

Originally Posted by Kevin Sevcik (Post 1117883)

A Spike may be bulkier, but you could use one spike to switch two banks of LEDs by wiring each motor output to the positive side of the LED and running the common directly back to the PDB.

Alternatively, a simple transistor LED driver can be made. Use one digital out pin per LED string.
The driver only needs one CORRECTLY SIZED resistor and transistor per string to work. Just use +12vdc to power it, and control it via the DSC.

Aren_Hill

01-02-2012 14:40

Re: LEDs connected to Solenoid Breakout. It's illegal, but why?

Quote:

Originally Posted by Al Skierkiewicz (Post 1117851)

Sorry,
Left off the last zero. 750 ma at 12 volts is 9 watts.
Joe, I was considering the total for LEDs for three strings plus the loads likely for other devices as totaling more than one amp. As Alan reminded me last year the manufacturer has this rather odd table listing for trip modes. One of those lines for total current is this...
"1 to 6 A, Channel does not trip, Module may be damaged."

So if i had an LED strip rated at 200ma (12v) It'd be alright to run off the solenoid breakout?

If its only one strip and minimal other things using the breakout

Al Skierkiewicz

01-02-2012 15:32

Re: LEDs connected to Solenoid Breakout. It's illegal, but why?

Aren,
Again subject to GDC desicision, but

[R63]
Outputs from each Solenoid Breakout shall not cumulatively exceed 16W for the cRIO-FRC (8-slot) and 21W for
the cRIO-FRC II (4-slot).

[R50]
e. Electric solenoids may alternatively be supplied by a Solenoid Breakout Board connected to the NI 9472
cRIO module, which is powered by 12V.

I find no other restrictions on the solenoid module for 2012.

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