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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.