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User name fansler
Log entry time 10:38:19 on May 29, 2009
Entry number 277307
keyword=Q1 cryo problem
Discovered the Q1 lead flows were high (normal 85, currently 130). The
Q1's were tripping on "cryo fault", but the He level was not dropping
below the set trip point. We guessed the He probes were generating trips
in response to increased pressure. Robert lowered the supply pressure
(CPI75DB08 1.6 to 1.42) and the lead flows came down into the normal
range (about 90 slm), this seemed to solve the trip "cryo fault" problem.
Both Q1's ramped normally. Note; all the magnet lead flows were high,
and all the lead flows dropped to normal range in response to the reduced
supply pressure.
A copy of this log entry has been emailed to: fansler@jlab.org