Dan, Sheila, ITMX
While testing the vioin mode damping tonight, we had an abrupt lockloss, and for a short period my bandpass filter at 501.094Hz was sending noise x120dB into the ITMX L2 coils. This tripped the coil current watchdog, just like a previous event on ETMY a few weeks ago. (There are now limiters on all the violin mode damping filters...)
Unlike ETMY we can't reset this watchdog by toggling the RMS Reset epics channel. Anyone know how to clear this error?
We suspect something in hardware is preventing a software reset. In the CDS highbay, the SUS Independent Watchdog electronics box has red lights that won't reset when we use the 'Fault Reset' button.
I asked the question about how to clear it when I was designing an alert on the Ops Overview screen for it. As I recall, all you have to do is change the value in the field from a 1 to a 0 and then back again? Also, I think Stuart Aston told me that watchdog would eventually go away.
So, normally changing that value back and forth WOULD be the way to clear it according to Stuart. This did not work. He then suggested I simply power cycle the PUM so with Sigg's approval I did and that seems to have worked. The L2 RMS watchdog trip on ITMX has been cleared. On a side note, this 'SUS Ind WD' chassis is ONLY cabled to the BIO I/O chassis for ITMY. It IS NOT documented on any of the current drawings and it isn't commissioned. It's current state can't be reset with the button on the front so I assume that it would have to be power cycled to be cleared. That being said, it isn't really connected to anything.
Currently experiencing the same behavior with ETMX L2 UL. Toggling the RMS WD reset does nothing.
Also, the ETMX indicator on the ops screen does not indicate this fault (the border is still green).