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-   -   Losing power through DS. (http://www.chiefdelphi.com/forums/showthread.php?t=112925)

Kevin Sevcik 11-02-2013 14:37
Re: Losing power through DS.
 
No RSL blnk and half the PWMS are out? What are you using to connect the DSC to your cRIO? If you're using a ribbon cable, that sounds like about half the ribbon cable isn't crimped properly. Try a different, known good ribbon cable and/or check your current ribbon for continuity. A good ribbon cable should have continuity pin-for-pin from the male to the female side.

Team3763 Adam 11-02-2013 16:29
Re: Losing power through DS.
 
We do have all three signal lights, Bat, 5V, 6V, and we are using the flat cable. We DO have the rounded cable and at today's meeting I plan on switching the flat cable to the rounded variant.

Kevin Sevcik 11-02-2013 18:05
Re: Losing power through DS.
 
Quote:
Originally Posted by Team3763 Adam (Post 1231742)
We do have all three signal lights, Bat, 5V, 6V, and we are using the flat cable. We DO have the rounded cable and at today's meeting I plan on switching the flat cable to the rounded variant.
If I recall correctly, there were different weird issues with some of the round cables. I believe they centered around using the accelerometer with I2C, so that may not be a concern for you.

Team3763 Adam 12-02-2013 13:10
Re: Losing power through DS.
 
Quote:
Originally Posted by Kevin Sevcik (Post 1231819)
If I recall correctly, there were different weird issues with some of the round cables. I believe they centered around using the accelerometer with I2C, so that may not be a concern for you.
I heard that also, and I don't think we'll be using an accelerometer. However, a gyro, is still up in the air. We replaced the flat cable with the round cable, and used a brand new DS. All lights were good, and the RSL flashed/stayed constant when it was supposed to. We have yet to test the PWM channels, but I have high hopes that they will work.

omalleyj 12-02-2013 14:13
Re: Losing power through DS.
 
Quote:
Originally Posted by Kevin Sevcik (Post 1231658)
No RSL blnk and half the PWMS are out? What are you using to connect the DSC to your cRIO? If you're using a ribbon cable, that sounds like about half the ribbon cable isn't crimped properly. Try a different, known good ribbon cable and/or check your current ribbon for continuity. A good ribbon cable should have continuity pin-for-pin from the male to the female side.
I agree with the above; also check for damage and proper seating of the connector on the sidecar and digital module.

This happened to us when the cable wasn't fully seated. One end was up only about a sixteenth of an inch, not really enough to see easily, but some PWMs stopped working.

I worked with another team who had a nick in their ribbon cable and the connection would cut out randomly. That one might sneek by a continuity check so do a visual inspection under a magnifier if you have one. Look for sharp creases as well as breaks in the insulation.

Good luck!

Doc Wu 13-02-2013 22:58
Re: Losing power through DS.
 
Quote:
Originally Posted by Team3763 Adam (Post 1231625)
If all else fails, in the previous years we've wired the light into the 12V terminal on the PD board. Could we splice the wires to the light and wires to the D-Link together and connect it to the same terminal?
You may think you wired it into the 12v terminal, but if you passed inspection, it most certainly was not. That is a very specific thing that is checked for during the power-up phase of inspection. It also is very likely to be noticed by the field personnel if not working properly.

Al Skierkiewicz 14-02-2013 08:00
Re: Losing power through DS.
 
In rare cases I have seen a DSC with all three lights on but dim. There was no connection to 12 volts on the PD. All three lights have to be on and bright.

toastnbacon 14-02-2013 12:12
Re: Losing power through DS.
 
Quote:
Originally Posted by Team3763 Adam (Post 1231651)
While we're on the DS, PWM channels 4-10 didn't seem to function at all, sending signal to the Jaguars it was told to. In the code, we changed the PWM to 4-10 depending on which channel we were testing. Could it be possible that ALL of these channels are blown? We've swapped PWM cables, used other channels, and tested other Jaguars to find that everything EXCEPT the PWM channels work.
I would also check the power to the DS. We had a similar problem last year.


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