Richard, Filiberto

Late last week I noticed the current meter for the Ham4 and Ham5 +-24V ISI DC supplies that feed the coil drivers were oscillating at about 1Hz and 0.5amps.  Today we connected a meter to the output lines of the supply and systematically shut down the ISI system starting with the Ham4 moving to Ham5.  First step was using guardian to take the system to READY state.  We then shut off the outputs using the watchdogs.  The oscillation remained until we shut off the 2nd Ham5 coil driver.  The system was brought back up and the oscillation was gone.  Re-engaged the software had guardian take it back to isolation.  Still no oscillation present.  I will check the power on this system during the week to see if it goes back into oscillation.    There was no obvious problem with the HAM isolation during this time.  If the oscillation returns we will power the HAM 5 electronics down first to see if this corrects the problem.