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User name Jack (Techs)
Log entry time 22:11:48 on November 05, 2009
Entry number 297666
keyword=Right Q2 status - OFF
Yesterday, prior to closing the hall, the Right Q2 power supply dumped
when it was at 1400 amps. After resetting the supply it dumped at about
50 amps. The supply was turned off for the night. We looked at it
today. There seem to be a number of problems, none of them with obvious
sources. The supply had a delay turning ON and OFF in remote mode. In
local mode there was no delay. It seems the optocoupler in the remote
control circuit was damaged. We replaced the optocouplers in the remote
interface and the supply turns ON and OFF correctly. Some strange
behaviors in the x-server/EDM/gateway/EPICS interfacing are adding to
the array of troubles. There was some initial thought the SCR's were
damaged, but this is not clear. It may be only a spurious feature in
waveform of the current input to the supply. For now, the 480VAC to the
supply has been locked out. We will continue working on it when the
hall is available tomorrow.