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User name stevensm
Log entry time 17:49:32 on August 09, 2006
Entry number 178724
keyword=left spectrometer bogie erratic motion
We observed the erratic operation of the left bogie system during an
access to the hall this morning. It appears to be the result of one or
more motor encoders failing from radiation damage. It was not
immediately apparent which one was causing the erratic motion, so we
changed the most likely encoder on the middle bogie motor number one. We
then tested the system briefly, as we moved the spectrometer back into
position, and it seemed that the erratic motion was still there. Jack
Segal is working on possibly adding some test points to the motors to
look at the raw pulse trains to detect intermittant failures.
A copy of this log entry has been emailed to: spiegel@jlab.org