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User name jpchen
Log entry time 09:51:24 on February14,2011
Entry number 346818
keyword=Fan speed for LH2 loop changed to be 48Hz
At 60 Hz fan speed, LH2 loop was not stable. HP power fluctuated significantly (>+-50 watts). Change PID parameters and change the sensor for feedback did not improve much. Reduced fan speed from 60 Hz to 48 Hz, the fluctuation was gone. We decided to run at 48 Hz instead of 60 Hz for LH2 loop (loop 2).