aLIGO LHO Logbook

LHO VE

thomas.shaffer@LIGO.ORG - posted 10:12, Thursday 15 August 2024 - last comment - 11:38, Thursday 15 August 2024(79552)

Vacuum channel alarm levels increased for new instrument air compressor

The new compressor runs at a higher pressure so the alarms needed to move with that. I changed the minor and major high alarms for H0:VAC-MR_INSTAIR_PT199_PRESS_PSIG for 127 and 130 respectively in epics via the vacuum computer in the back of the control room. These alarm levels cannot be changed outside of the vacuum network. I did not see this channel in the VAC SDF.

Patrick will check if these values are hard coded into Beckhoff and will adjust accordingly.

Comments related to this report

david.barker@LIGO.ORG - 11:00, Thursday 15 August 2024 (79554)

Link

Currently the slow-controls SDF is not able to monitor non-VAL fields (e.g. alarm fields). Future release will have this feature.

patrick.thomas@LIGO.ORG - 11:38, Thursday 15 August 2024 (79555)

Link

I made the following changes to the PLC code generation scripts (not pushed to the running code) to enable setting the alarm levels for each instrument air pressure EPICS channel separately. I set the alarm levels to what they currently are. Should any of these be changed?
https://git.ligo.org/cds/ifo/beckhoff/lho-vacuum/-/commit/8d17cfe3284147b4e398262091ec9d9f2ddbb6ab

If there are no objections, I will plan to push this change when we make the changes to add and rename filter cavity ion pump controllers.