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User name M. Stevens
Log entry time 16:31:40 on April 03, 2007
Entry number 197758
keyword=Rt. Dipole new failure mode
Yesterday morning the right dipole "locked up" and would not respond to
either software generated commands or manual inputs through the power
supply gui. It was stuck at 369 amps. We attempted the right dipole
flying reset procedure using a local terminal (laptop) to no avail. The
Dynapower Octaqgon computer would not return a ">" or echo characters.
It would occasionally execute a command, such as RST, albeit with a time
delay of at least several seconds. Troubleshooting revealed a dead
RS-232/RS-485 converter module in the slow controls serial cross connect
chassis in rack 1H75B05. We replaced the module, and everything worked
normally.
A copy of this log entry has been emailed to: folts@jlab.org, segal@jlab.org, fansler@jlab.org, spiegel@jlab.org