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User name fansler
Log entry time 14:25:28 on October 31, 2007
Entry number 210869
keyword=Right Q1 Current is Railing
The right Q1 liquid level displayed “inf” on the tools GUI, but was
correct on the cryo page. We rebooted the right IOC, no joy. We cycled
power on the magnet, no joy. We entered the hall and cycled the power
supply locally. When we turned the power supply on the current railed, we
had a DC over current, and a cryogenic fault. We troubleshot the cryo
fault and discovered a loose lead flow cable and a board (TI) in the
Saclay rack was not seated properly. Cryo faults fixed. We swapped the
DAC in the magnet power supply, no joy. We swapped the motherboard, and
all faults cleared. Bonus…the current offset problem was also corrected.
We measured the liquid level read back voltage at the output of the
Wiedmuller and it was good. We ran out of time to troubleshoot the
original “inf” fault. We will continue troubleshooting during our next
opening.
A copy of this log entry has been emailed to: fansler@jlab.org