aLIGO LHO Logbook

H1 SUS

richard.mccarthy@LIGO.ORG - posted 12:29, Tuesday 28 July 2015 - last comment - 16:20, Tuesday 28 July 2015(19994)

EX LVLN ESD drive

In an attempt to make both end stations function the same we installed the Low Voltage Low Noise  ESD driver below the existing HV ESD driver.  Finished pulling the cables and hooked everything up.  I verified that I could get Low Voltage out but could not proceed to HV testing do to site computer work.  I have left the controls for the system running through the LVLN system but have the High voltage cable still driving from the ESD driver directly.  Re testing will continue after software issues are fixed.

Comments related to this report

jeffrey.kissel@LIGO.ORG - 16:20, Tuesday 28 July 2015 (20003)CDS

Link

J. Kissel, R. McCarthy

In order to make the HV + LVLN driver function as expected, and to obey the wiring convention outlined in D1400177 (which is sadly different from the rest of the suspensions 4-quadrant stages), we required a model change at the top level: a reordering of the outputs of the ESD control request from 
DAC3_0 = DC
DAC3_1 = UL
DAC3_2 = LL
DAC3_3 = UR
DAC3_4 = LR
to
DAC3_0 = DC
DAC3_1 = UR
DAC3_2 = LR
DAC3_3 = UL
DAC3_4 = LL
Note that this channel re-ordering corresponds to how Richard has reordered the cabling in analog, so there has been no overall change in signal ordering. Also note that this change has already been made to ETMY, but it didn't get much attention in the flurry to get the ETMY LVLN driver installed LHo aLOG 18622. 

Attached are screenshots of the change.

The updated top-level model had been committed to the userapps repo as of rev 11106:
jeffrey.kissel@opsws10:/opt/rtcds/userapps/release/sus/h1/models$ svn log h1susetmx.mdl 
------------------------------------------------------------------------
r11106 | jeffrey.kissel@LIGO.ORG | 2015-07-28 15:49:04 -0700 (Tue, 28 Jul 2015) | 1 line

Changed L3 ESD DAC output order to accommodate new wiring for LVLN driver, installed July 28 2015.

Images attached to this comment