kiwamu.izumi@LIGO.ORG - posted 02:44, Friday 01 May 2015 - last comment - 09:33, Friday 01 May 2015(18132)
PSL tripped at 8:24 UTC, restarted
Seemingly the same symtom as ysterday (alog 18123). I did exactly the same recovery process. It is now back up and running.
Confirming that the two PSL trips recently noted by Kiwamu (alogs 18123 and 18132) were for the same reasons detailed in alog 18083: the diode chiller flow interlock H1:PSL-IL_DCHILFLOW is tripping for no apparent reason. Attached are trends from the trip events. Also, there was a third another trip, between the two Kiwamu noted, on 4/30/2015 at 4:19:43 UTC that was not in the alog; this trip did bring down the NPRO (as can be seen in PSLtrips2015-04-29to2015-05-01.png), but there is no indication in the log that the trip was manually reset. Evidence attached below (PSLtrips2015-04-29to2015-05-01.png and PSLtrip#22015-04-3004:19:43.png), same cause as the rest.