peter.king@LIGO.ORG - posted 05:22, Thursday 08 September 2016 - last comment - 09:29, Thursday 08 September 2016(29536)
laser tripped
The laser tripped this morning. From the laser MEDM screen it looked like the NPRO had tripped which would pull
the entire system down. However the Beckhoff screen indicates otherwise; that the fault is associated with the
crystal chiller. It should be noted that the crystal chiller has 10468 hours on it.
Logs indicate that it tripped around 3 am. Unfortunately I did catch the trip.
Further inspection shows that the laser tripped not because of the crystal chiller (see AMPFlow.png).
Might be due to flushing of the newly deployed (old) manifold.
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Looks like the power meter circuit caused the trip this time around. Doesn't appear to be the crystal chiller, however I am uncertain how often the chiller flow is updated via the RS-232 link.
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The PSL trips over the last couple weeks have all been due to the Front End flow glitching. Suspecting the FE flow sensor might be faulty we swapped the PSL water manifold for the spare, with new flow sensors installed on the spare. As Peter says above this latest trip was due to the Power Meter water circuit (first time we've had an issue with this water circuit since the end of July). Unclear at this time what the cause was, although it's likely to be junk stirred up by our manifold swap on Tuesday working its way through the system (as Peter mentions above); Peter has some pictures of the output water filter for the PSL cooling system and there are a few new occupants taking up residence.
Filed FRS #6169.