Reports until 17:27, Tuesday 13 May 2014
H1 SEI (ISC, SEI)
sheila.dwyer@LIGO.ORG - posted 17:27, Tuesday 13 May 2014 - last comment - 17:34, Tuesday 13 May 2014(11866)
Moving IMC VCO trips HAM2+3 Seismic

I moved the tune offset on the IMC VCO, and HAM2 HEPI tripped, (plot attached) HAM2 ISI, HAM3 IOP tripped so HEPI, ISI MC2, and PR2 were all tripped. 

While we were trying to recover things tripped again.

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Comments related to this report
sheila.dwyer@LIGO.ORG - 17:34, Tuesday 13 May 2014 (11867)
Link

One way that works to recover from this is to:

  1. pause the IMC guardian,
  2. open the input to the IMC board to prevent it from kicking the suspensions.
  3. start untripping things (Suspensions, IOP, and HEPI), but not the ISIs
  4. Isolate HEPIs
  5. when the scripts are done isolating hepi untrip the ISIs and the guardian will isolate them
  6. restart the IMC guardian