aLIGO LHO Logbook

H1 CDS

sheila.dwyer@LIGO.ORG - posted 01:53, Wednesday 29 July 2015 - last comment - 08:24, Wednesday 29 July 2015(20016)

ETMX ESD not turning off

We noticed that we can't really turn off the ETMX ESD. We aren't sure why.

This causes the guardian to hang, in the state LOWNOISE_ESD_ETMY because it checks that the ESD is off. This can be worked around using manual, but the operator has to be carefull not to skip steps if we force the gaurdian to move on.

Comments related to this report

richard.mccarthy@LIGO.ORG - 06:19, Wednesday 29 July 2015 (20022)

Link

Not sure why this is.  I was able to cycle the power to the High Voltage ESD Amp multiple times from the Binary MEDM screen.  I was also able to turn each channel On and Off individually from this screen as verified at the output of the unit not just the read-back.

richard.mccarthy@LIGO.ORG - 07:42, Wednesday 29 July 2015 (20024)

Link

We need to update the channel that is used to turn the ESD on  and off.  I verified again this morning that the Binary switch does in fact work.

jeffrey.kissel@LIGO.ORG - 08:24, Wednesday 29 July 2015 (20029)ISC, SUS

Link

I second what Richard says -- the Beckhoff binary signal that *was* used to control the HV driver on ETMX has now been replaced by similar "fast front-end" binary I/O that's at ETMY. So, for each quadrant, to turn off the high voltage, set the EPICs records 
H1:SUS-ETMX_BIO_L3_${QUADRANT}_VOLTAGE_SW to 0 and
H1:SUS-ETMX_BIO_L3_${QUADRANT}_HVDISCONNECT_SW to 0.

This has been true since Richard cabled up the LVLN driver yesterday afternoon (see LHO aLOG 19994).