D. Barker, C. Gray, J. Kissel, B. Weaver, T. Shaffer In order to prepare for the work Marc & co. are doing today re-organizing the DC power supplies to the ISC and SQZ racks work permit (WP 11193), we thought hard about the racks and subsystems impacted by that work. As such, we've taken the following actions (in the order listed): - IMC -- was locked, un-managed the IMC_LOCK guardian, and brought the state request to OFFLINE. - Filter Cavity -- was locked on green, brought the SQZ manager to DOWN - The following computer systems for ISC models are using ADCs and DACs from the similarly named IO chassis are powered by the power supplies in the WP -- including even some (again, but not all) CHANS_NOT_MON, :: h1iopomc0 >> This IO chassis is in rack SQZ-C1, whose +24V power is going to be changed to be supplied by a different power supply (needed due to actions 3 and 7 listed in WP) - h1omc - h1omcpi :: h1lsc0 >> This IO chassis is in rack ISC-C1, whose faulty -18V power supply is going to be replaced (needed due to action 8 listed in WP) - h1lsc - h1lscaux - h1sqz - h1ascsqzfc :: h1asc0 >> this IO chassis is in rack ISC-C1, whose faulty -18V power supply is going to be replaced (needed due to action 8 listed in WP) - h1asc - h1imcasc - h1ascsqzifo So, - we browsed through (though did not peruse) the SDF systems for the above listed models, confirmed that there were no SDF diffs for these model's monitored signals (and even some). Didn't find any, but accepted the unmonitored, guardian controlled, signals for the h1omc just so we start from a better place (e.g. the DARM offset was set at -42 rather than the modern 9.7). - Finally, we asked Dave to power down these IO chassis safely by first removing them from the Dolphin Network, and then shutting down all the front-end processes, and he has now done so (see LHO:69630). We're ready for ISC rack power supply work!!
Additional Effects From This Morning's Power Supply Work For The ISC RF Racks: