Reports until 13:16, Monday 19 December 2016
LHO VE (CDS)
david.barker@LIGO.ORG - posted 13:16, Monday 19 December 2016 - last comment - 13:46, Monday 19 December 2016(32741)
test of CP3,4 Autofill with high discharge line pressures

Kyle, Gerardo, Dave:

This morning we ran the cp3 and cp4 autofill code, testing its monitoring of the discharge line pressure. Ryan was at MY during the tests, and introduced a high discharge line pressure (DLP) by manually controlling the bypass valve.

Attached are trend plots of the two events, CP3 on the left, CP4 on the right. Each 2x2 plot shows the two thermocouple  (TC) readings on the left, the fill valve position upper right and the DLP bottom right.

CP3:

This CP filled before the DLP could climb over the 2.0 PSI threshold. The autofill terminated normally, with the TCs reading a temperature below the threshold of -30C. The log text shows a normal fill sequence:

Mon Dec 19 11:05:02 PST 2016
Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 25% open. Fill completed in 43 seconds. LLCV set back to 19.0% open.
 

CP4:

This CP caught the DLP above threshold error before or simultaneously with the TCs dropping below the -60C threshold. This is reflected in the autofill log text (error shown as bold text)

Mon Dec 19 11:10:02 PST 2016
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Over pressure. Fill stopped. LLCV set back to 36.0% open.
 

We believe this has successfully tested the code will stop filling if the DLP line goes high. On Wednesday 21st we will run the system in hands-off mode.

Images attached to this report
Comments related to this report
david.barker@LIGO.ORG - 13:45, Monday 19 December 2016 (32742)

For the record, here is a description of the code and how it is ran.

The code runs as a crontab as user vacuum on the machine vacuum1.

The code runs on Monday, Wednesday and Fridays. CP3 fill happens at 11:00 local time, CP4 at 11:10.

Here is the crontab text:

00 11 * * 1,3,5 /opt/rtcds/userapps/release/cds/h1/scripts/run_autofill_cp3.bsh &
10 11 * * 1,3,5 /opt/rtcds/userapps/release/cds/h1/scripts/run_autofill_cp4.bsh &
 

The bash scripts are attached, they specify the LLCV percentage open, the TC threshold and the timeout as arguments to the cpn_fill.py python scripts.

The cpn_fill.py python scripts are also attached.

(Note: files were renamed with a .txt suffix so they can be uploaded into alog.)

Non-image files attached to this comment
david.barker@LIGO.ORG - 13:46, Monday 19 December 2016 (32743)

all scripts are maintained in the CDS SVN.