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  #16   Spotlight this post!  
Unread 11-02-2013, 14:37
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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.
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Unread 11-02-2013, 16:29
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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.
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Unread 11-02-2013, 18:05
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Re: Losing power through DS.

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Originally Posted by Team3763 Adam View Post
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.
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Unread 12-02-2013, 13:10
Team3763 Adam Team3763 Adam is offline
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Re: Losing power through DS.

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Originally Posted by Kevin Sevcik View Post
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.
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Unread 12-02-2013, 14:13
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Re: Losing power through DS.

Quote:
Originally Posted by Kevin Sevcik View Post
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!
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Unread 13-02-2013, 22:58
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Re: Losing power through DS.

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Originally Posted by Team3763 Adam View Post
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.
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Unread 14-02-2013, 08:00
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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.
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Unread 14-02-2013, 12:12
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Re: Losing power through DS.

Quote:
Originally Posted by Team3763 Adam View Post
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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