jason.oberling@LIGO.ORG - posted 11:55, Friday 09 September 2016 - last comment - 14:15, Friday 09 September 2016(29566)
PSL Chillers Swapped for Backup
P. King, J. Bartlett, J. Oberling
We swapped the PSL chillers for the backup in an effort to isolate the recent laser tripping issues. The laser is now back up and running.
Operating hours for the chillers, as reported by the chillers themselves and the chiller MEDM screen, are:
| Chiller | MEDM | |
| Crystal | 148.75 | 33317.00 |
| Diode | 86.25 | 33560.00 |
There is a difference between the chillers and MEDM because the MEDM screen gets its info from the PSL Beckhoff PC, which uses its own internal counter to track the chiller hours instead of the hours recorded by the chillers themselves; we currently do not know a safe way to reset this Beckhoff counter.
The new chiller details are: xtal chiller : P325-18636-3, S/N 64150 diode chiller: P605-18637, S/N 63793 Attached plot is the first couple hours of vital signs.