jeffrey.kissel@LIGO.ORG - posted 13:33, Thursday 10 August 2017 - last comment - 15:22, Thursday 10 August 2017(38124)
ETMY UIM Coil Driver Constantly Winning HVeto
J. Kissel, S. Dwyer, P. Marsh, for team DetChar Paul just gave an excellent walk-through of the summary page for the DetChar tool "hveto," (see summary page and descriptive paper). In the walk through, he pointed out that the noise monitor channels for the H1 SUS ETMY L1 (UIM) stage (e.g. H1:SUS-ETMY_L1_NOISEMON_LR_OUT_DQ) are consistently "winning" the veto rounds for a given day, and have been for quite some time. I attach a plot courtesy of DetChar that shows how many h(t) triggers have been removed after vetoing using these UIM NOISEMON channels from Jun 30 to Jul 15 2017. We should begin investigating this in more detail. While I don't yet advocate a replacement of this coil driver, I suggest we at least power cycle the drive signal chain (analog electronics) ASAP.
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Created FRS Ticket 8725
Between 21:45 UTC & 22:00 UTC I have powered off, let sit for ~1-2 minutes, then powered back on the H1 SUS ETMY UIM (L1) coil driver electronics, including its AI chassis and Coil Driver (which also powers off the Satellite Amplifier). This only excludes the monitor signal's AA chassis, but given that these glitches couple to DARM, I don't suspect this is an artifact of the noise monitor's AA chassis. In order to do so, because the TOP (M0 and R0 stages) are on the same AI chassis, I (0) Unmanaged SUS_ETMY guardian by clicking to AUTO on main guardian screen (1) Brought SUS to SAFE using guardian (2) Powered OFF AI and CD chassis using big white rocker switch on the back of each (3) Waited for a few minutes (4) Powered ON AI and CD chassis (5) Brought SUS back to ALIGNED using guardian The operator / commissioning staff ran INIT on ISC_LOCK guardian to re-manage SUS_ETMY guardian. Also of note, both chassis where hot to the touch -- about as hot as my white car that had been baking in the 100 [deg] heat all day, or as hot as one can bear the water in a shower -- ~100-110 [deg F], or 38-43 [deg C]. Brief discussion with Richard after the fact: "yeah, the AA / AI chassis run hot, but within spec. Odd that the coil driver was just as hot..." Attached is a picture of the H1-SUS-C1 ETMY rack in which they live (furthest left as you walk in from the door), with the chassis I rebooted highlighted with a yellow arrow. AI Chassis -- SN S1108084 UIM Chassis -- SN S0900304 Other useful electronics drawings I used: - D1002741, aLIGO SUS ETM System Wiring Diagrams - T1100378, aLIGO QUAD Controls Design Description
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