keita.kawabe@LIGO.ORG - posted 18:28, Thursday 12 April 2018 - last comment - 14:41, Friday 13 April 2018(41418)
ISS second loop model change
Due to hardware BIO logic change in the ISS 2nd loop board (D1600298, HIGH/LOW=NO/NC in V2, HIGH/LOW=NC/NO in V3), I removed or added NOT in all relevant BIO control and readback channels in psliss frontend.
I removed H1:PSL-ISS_SECONDLOOP_REFERENCE_VALUE_CAL filter and H1:PSL-ISS_SECONDLOOP_REFERENCE_VALUE EPICS channel, these were necessary before as the slow offset loop and digital excitation combined had one dedicated analog input, now these are added together with the 3rd loop. This analog input was reassigned to the BNC input on the chassis.
I just saved the model but hasn't compiled yet.
Right now it seems like BIO is not working. Despite the logic change the old model should be working (with inverted logic), but flipping BIO control channels (e.g. H1:PSL-ISS_SECONDLOOP_PD_SELECT) doesn't seem to change BIO readback (e.g. H1:PSL-ISS_SECONDLOOP_PD_SELECT_MON). Is the board connected at all?
I went to the rack and confirmed that the chassis was not powered on. I'll wait until people are done with any work needing PSL light.
Compiled. Not installing for now as this will interfere with PSL work. In the mean time I made a new MEDM screen for the second loop (1st screen shot).
Also attached are before/after screenshot of the BIO and slow offset path.