david.barker@LIGO.ORG - posted 10:54, Tuesday 02 May 2023 - last comment - 12:03, Tuesday 02 May 2023(69245)
h1seib1 (ITMY) down for CER power supply replacement
Jeff, Marc, Corey, Dave:
h1seib1 is down while Marc replaces aging and failing DC power supplies to this CER rack (24V and 18V).
SEI Power Supplies Replaced per WP11171
SEI-C4 MEZ-C3 U22 IO Chassis +24V Kepco supply S1201989 replaced with S1201958 which has an updated BB fan. Power at supply measured at 24.5V 2.5A. Analysis of old supply, the fan was siezed and the motor shaft was blued.
SEI-C4 MEZ-C3 U38 BSC1 -18V Kepco supply S1201991 replaced with S1300292 which has an updated BB fan. Power supply measured at 18.5V 6A. Old supply fan was screeching loudly and vibrating, the bearing was about to fail.