edmond.merilh@LIGO.ORG - posted 08:37, Sunday 26 February 2017 - last comment - 10:28, Sunday 26 February 2017(34415)
PSL Diode Chiller and Frontend Alarm
16:15UTC I noticed that the Diode Chiller alarm was intermittently flashing RED. When I went into the Diode room I didn't see the light on the unit blinking at all less the frequency at which medm was reporting it. I'm going to add water to it and check the status again. THe frontend warning light is also intermittently flashing. Are the two related? Below is a plot from the last 7 days. I looked back 20 days but saw nothing else.
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16:40 Added 500mL of water to Diode Chiller. Chiller alarm has ceased. Frontend alarm still flashing, frequently, for a couple of minutes following the drink but seems to have ceased as well. Perhaps the two were related after all.
I think you'll find that if the front end laser power dips below 34 W, then the MEDM status button will flash.