This morning I completed the weekly PSL FAMIS tasks.
HPO Pump Diode Current Adjust (FAMIS 8449)
With the ISS OFF, I adjusted the operating current of the HPO DBs. The changes are summarized in the below table and a screenshot of the PSL Beckhoff main screen is attached for future reference.
| Operating Current (A) | ||
| Old | New | |
| DB1 | 51.9 | 52.3 |
| DB2 | 54.1 | 54.5 |
| DB3 | 54.1 | 54.5 |
| DB4 | 54.1 | 54.5 |
This is a large increase for just one week of operation, which can be an indication of a DB nearing the end of its life (remember that DB2, DB3, and DB4 are still the original DBs installed when the H1 PSL was in late 2011/early 2012). We will keep an eye on this.
I did not adjust the operating temps of the DBs. The HPO is outputting ~154.0 W and the ISS is back ON. This completes FAMIS 8449.
PSL Power Watchdog Reset (FAMIS 3920)
I reset both PSL power watchdogs at 17:18 UTC (9:18 PST). This completes FAMIS 3920.
Attached is a trend of the operating current of the HPO DBs. The uptick in the current increase can be seen in all DBs over the last few weeks.
