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eleonora.capocasa - 16:13 Friday 22 March 2019 (8472) Print this report
Vertical drift of payload triggers dackills

[Lucia, Eleonora]

After the start of ITMs cooling-down we obserbed that a slow drift of the payload vertical postion of ITMX and ITMY brought the IM photosensor RMS monitors above the set threshold, triggering the dackills.   As a consequence, the controls of the whole tower opened.  Pic1 (long trend data),  Pic 2(ITMX),   pic3 (ITMY))

In fact, the logic of the dackills is such that the presence of a red watchdog flag EITHER in the tower OR in the payload zeros ALL the DAC outputs. (pic 4)

In order to reset the dackill we were forced to increse the rms treshold. This happend few times.

Apart from choosing a proper threshold, we wonder if the watchdog/dackill logic could be improved to avoid this kind of events.

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