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.