Author Topic: Melting ribbon cable - SOLVED  (Read 146 times)

Offline thetraveller333

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Melting ribbon cable - SOLVED
« on: December 07, 2018, 06:58:18 PM »
I tried the following setup:


F16V2-R controller with a 16 port expansion board mounted in a GC1500 enclosure
5VDC powering the right side of the controller
No power connected to the left side of the controller
12VDC powering both sides of the expansion board


There are no lights attached to any of the 32 ports.


When I plugged everything in, the 3rd conductor from the right and the 3rd conductor from the left on the ribbon cable connecting the controller with the expansion board, got very hot, melted the insulation and started smoking.  It took about 3 to 5 seconds to get to the smoking point.  I didn't notice anything on either of the boards themselves smoking, but I couldn't be sure.


Is this not a valid configuration?
Is there a jumper or a setting that I  missed?
I would appreciate any input.


Thank you.
« Last Edit: December 08, 2018, 05:58:52 PM by thetraveller333 »
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Offline JonB256

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Re: Melting ribbon cable
« Reply #1 on: December 07, 2018, 07:31:29 PM »
Is the expansion board Red or White?  The F16v2R has its own Red board.

Because the white F16v3 can have two expansion boards, there are differences.

Offline thetraveller333

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Re: Melting ribbon cable
« Reply #2 on: December 07, 2018, 09:42:13 PM »
Both the controller and the expansion boards are red.

Offline StickyWicket

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Re: Melting ribbon cable
« Reply #3 on: December 07, 2018, 09:52:17 PM »
Did you make sure that the ribbon was in the correct orientation and not offset by a pin or two?

Offline thetraveller333

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Re: Melting ribbon cable
« Reply #4 on: December 08, 2018, 05:14:45 AM »
I checked and the ribbon cable was seated correctly.


I also checked the voltages and found that what I thought was 12 VDC on both sides of the expansion board, was actually 14 VDC.  The 5 VDC at the right side of the controller was correct.  Could the additional 2 volts cause this?


Is there a jumper or setting on the controller board which needs to be changed, when changing from 12V to 5V power?


I tested the controller by itself, without the ribbon cable connected to the expansion board, with 12 VDC powering both sides and it worked fine.


I will test the controller by itself with 5V on the right side and then with 5V on both sides and see what I get.


Just thinking out loud . . . what would happen if I had mistakenly reversed the 5V positive and negative wires at the controller?

Offline Todd

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Re: Melting ribbon cable
« Reply #5 on: December 08, 2018, 06:18:32 AM »
David told me there is reverse polarity protection last year when I inadvertently did the same thing. Reversed the connections and the Controller is still working fine. There is a jumper for 5v. I run mine on 5v.
Todd L.
Kimberly, WI

Falcon F16V3 F48, FPP, X-Lights, LOR, Pi 3B

Offline thetraveller333

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Re: Melting ribbon cable
« Reply #6 on: December 08, 2018, 07:04:42 AM »
I'll take a look at the board and see if I can find the jumper for 5V.  If anyone can point me to the right location on the board, I would appreciate it.

Offline allknowing2012

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Offline darylc

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Re: Melting ribbon cable
« Reply #8 on: December 08, 2018, 03:30:17 PM »
When I plugged everything in, the 3rd conductor from the right and the 3rd conductor from the left on the ribbon cable connecting the controller with the expansion board, got very hot, melted the insulation and started smoking.  It took about 3 to 5 seconds to get to the smoking point.  I didn't notice anything on either of the boards themselves smoking, but I couldn't be sure.

Whilst I don't have any answers for you, the 3rd from the left and 3rd from the right are both Ground.
The only thing I can think of causing melting the ground lines would be if you didn't plug your ground wires into the V1 & V2 terminals where you are connecting the 12V.
Daryl



Offline Todd

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Re: Melting ribbon cable
« Reply #9 on: December 08, 2018, 05:42:37 PM »
RH side of board in the middle. Two jumpers, one for each side of the board 7-12v or 5v.

Offline thetraveller333

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Re: Melting ribbon cable - SOLVED
« Reply #10 on: December 08, 2018, 05:56:44 PM »
Setting the jumpers for 5VDC on V2 did the trick.  Problem solved.


Thank you to all for the help and advice.

 

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