Monday 9 March 2015

Intermittent Surface Subsea & Video Comm Lost

Intermittent Surface Subsea & Video Comms Link Lost

So It all started with replacing tether drum on Panther, I was day shift supervisor and we had two day weather window before barge starts laying next pipeline and we decided to replace tether drum as we had only 28 units left on drum and everything went smooth as we managed to complete both TMS JB and ROV JB side pretty quick as everything was running on Copper wires.
After deck checks i started system configuration and after configuration i realized two aft thrusters stopped working, So i started configuration again and after configuration we got error of Surface subsea comms lost.

So we restarted system and everything went normal again and deck checks done but still again surface subsea comms lost.

So first thought in mind was may be loose connection in one of JB as that is only thing we opened last and we had good look on twp in both JB and it was fine there so we ruled out loose connection.
Next place to look was to start logical troubleshooting from top side so i checked LASCAR power supply #1 which supplies 5V to CPU on top side and it was 5V on backplane as we were checking voltage we got Video communications link lost now this error means top side cpu and video processor are unable to talk to each other as we were sure about power supply, we thought its either CPU or video processor so tried replacing both but still result was same we still had intermittent surface subsea and video comms lost.

At last i opened subsea electronics pod as there might be a chance of subsea processor going bad or power supply not adequate, In pod power supply was ok and replaced processor as well but made no difference.

We still had surface and video comms turn by turn and occasionally system will run perfectly without any problems.

When one of the techs were inspecting weather cards are pushed in backplane properly he realized backplane is loose and it was that back plane which was giving us intermittent comms and video link lost.

This is my first post regarding troubleshooting seaeye but i will keep on updating on weekly basis, Please do comment or follow if you like blog.






2 comments:

  1. Nice, Deep! Keep on writing :)

    Sincerely yours,
    Pavel V. Apukhtin

    ReplyDelete
  2. You can always check F3 too, that's where the 5V supply always gets interrupted..

    ReplyDelete