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Reports until 06:21, Wednesday 13 February 2019
H1 PSL (PSL)
peter.king@LIGO.ORG - posted 06:21, Wednesday 13 February 2019 - last comment - 13:17, Wednesday 13 February 2019(46924)
Diode chiller observation
The laser was left off last night after tripping, as per Keita's alog entry.  This morning the diode chiller outlet temperature was 30.7 degC,
with a set point of 20.0 degC.  This is a temperature reported by the chiller and is independent of the laser.  The "new" diode chiller does not
display an error message, unlike the unit that was switched out.  Why the outlet temperature should be so high for two different units is a bit
of a mystery to me.

    The little cartoon on the controller says 64%, which is some indication of how hard something in the chiller is working (just what
exactly I need to read the manual to find out).
Comments related to this report
jason.oberling@LIGO.ORG - 09:25, Wednesday 13 February 2019 (46926)

Has any attempt been made to change the diode chiller controller?  This solved a similar issue at LLO last week (chiller cooling water up near 30 °C causing DB overtemp errors and shutting the laser down).

jason.oberling@LIGO.ORG - 08:40, Wednesday 13 February 2019 (46925)

Entered FRS ticket 12318 to track this.

peter.king@LIGO.ORG - 13:17, Wednesday 13 February 2019 (46929)
Swappimg controllers did not work.
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