jeffrey.bartlett@LIGO.ORG - posted 09:12, Wednesday 10 August 2016 - last comment - 16:31, Wednesday 10 August 2016(28978)
FSS Unable to Lock
Found the FSS AUTOLOCK was oscillating. Could not adjust the gain due to Guardian control. Per Jason: (1). Took the Guardian node PSL_FSS to AUTO (2). Set the state to IDLE (3). Adjust the COMMON GAIN to 16dB (4). Set the state to READY_FOR_MC_LOCK Jason and TJ are looking into an elegant long term solution.
I did a few things today.
1) Updated the final FSS Common Gain to its new value of 16 (previously 20).
2) Rather than just throwing in the new gain when the FSS is no longer oscillating, it will make four steps for one second each to get there. If the FSS begins to oscillate while it is stepping, then it will start over when the oscillation is done.
I tested it a bit and all seemed well, but if there are any issues then just go back a revision.