40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Mon Jul 30 11:05:44 2018, gautam, Update, SUS, IFO SUS wonky IMG_7102.JPG
    Reply  Mon Jul 30 16:11:54 2018, gautam, Update, SUS, Trillium interface box is broken 
       Reply  Mon Jul 30 18:19:03 2018, Koji, Update, SUS, Trillium interface box was fixed and reinstalled P_20180730_173134.jpgP_20180730_180151.jpg
          Reply  Tue Jul 31 08:17:55 2018, Steve, Update, SUS, Trillium interface box was fixed,reinstalled & working all_OK.png
Message ID: 14117     Entry time: Mon Jul 30 16:11:54 2018     In reply to: 14115     Reply to this: 14118
Author: gautam 
Type: Update 
Category: SUS 
Subject: Trillium interface box is broken 

[koji, steve, gautam]

We debugged this in the following way:

  1. Disconnect all fuses in the terminal blocks coming from the +/- 20 VDC Sorensens.
  2. Check that they are indeed isolated using DMM.
  3. Test blocks of fuses in order to identify where the problem is happening (i.e. plug fuses in, turn up Sorensen voltage knobs, look for current overload). We did things in the following order:
    • MC suspensions
    • BS, PRM and SRM
    • ITMY
    • ITMX
    • Trillium interface box.
  4. Turns out that the Trillium box is the culprit.
  5. Confirmed that the problem is in the trillium interface box and not in the seismometer itself by unplugging all cables leading out of the interface box, and checking that the problem persists when the box is powered on.

So for now, the power cable to the box is disconnected on the back end. We have to pull it out and debug it at some point.

Apart from this, megatron was un-sshable so I had to hard reboot it, and restart the MCautolocker, FSSslowPy and nds2 processes on it. I also restarted the modbusIOC processes for the PSL channels on c1auxex (for which the physical Acromag units sit in 1X5 and hence were affected by our work), mainly so that the FSS_RMTEMP channel worked again. Now, IMC autolocker is working fine, arms are locked (we can recover TRX and TRY~1.0), and everything seems to be back to a nominal state. Phew.

ELOG V3.1.3-