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User name Jack
Log entry time 19:56:37 on May 02, 2007
Entry number 200833
keyword=Work on Left Dipole
During the access today Mark, Heidi and I replaced the optocouplers on
the two Allen-Bradley DC Input modules. The power supply had an
overtemperature fault that would not clear. Checking the thermostatic
switch circuit it showed neither of the switches were open. The next step
in the chain is the optocoupler reading the status. After the
optocouplers were replaced, the supply turned on with an overtemperature
fault, which is not unusual. The fault cleared when reset, as it should.