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Reports until 09:14, Wednesday 26 February 2014
H1 SEI
hugh.radkins@LIGO.ORG - posted 09:14, Wednesday 26 February 2014 (10342)
New tilt at ETMX--39 urads more now.

HugoP reported on 12 Feb that we had an issue with the EndX HEPI being unable to tilt completely.  We were requesting 390000nrads but only getting 350000.  Hugo pushed it more and it went more but it would never go to the fuly requested value.  Hint, hint--like there was an offset in the path...hummmm

I can't find an entry in the alog around Jan21, when this offset in the position request showed up (see Hugo's first link.)  However, when I look a little deeper I find the offset was increase to 39000 on Friday Jan 17 by me to run the RY Tilt manually (I guess it shoould have been 390000.)  It looks to me that on Monday the 21st, myself or Sebatian turned the HEPI position loops on but failed to turn off the offsets giving the offset observed since then.  Obviously our 'greening' of the system must be more robust.

I found this yesterday after the RCG upgrade reboot attempting to get the system back on.  The safe.snap was problematic so Dave reloaded form the 9am burt.

So by removing these offsets, the HEPI will now tilt that much more.  If the alignment is intolerable, change the target/current setpoint on the DC BIAS medm from -389800 to -350000.

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