david.barker@LIGO.ORG - posted 13:08, Tuesday 24 October 2017 - last comment - 13:59, Tuesday 24 October 2017(39149)
Tested HWWD on ITMY, updated MEDM screens
Ed, Richard, Fil, Dave:
we tested the ITMY HWWD by disconnecting one of the DB-37 front connectors which simulates a failed OSEM-LED. I modified my MEDM screen to show the countdown of the Time To Fail (TTF). I also added a red border if the TTF minute value falls below 19 minutes. Attached screens show the countdown at the 4 minute mark, and after the SEI (ISI) coil drivers had been powered down. In this test this happed at 0:20 in the count down.
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I further tested that the unit could not be reset (via the front panel button) if the fault condition was ongoing. After plugging in the satellite amp cable and removing the fault condition, I was successful in resetting ITMYs HWWD and BSC1 ISI coil driver chassis sprung to life.