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User name jpchen
Log entry time 10:40:43 on December21,2010
Entry number 345437
keyword=Loop 1 temperature readout problem fixed
Loop 1 temperature sensors take turn to read maximum every a few seconds. The ITC_502 readings are stable (ch 1=119.99, ch 2= 22,
ch3= 22.27). Without a proper temperature reading, HP heater PID does not work. IOC reboot did not help.
I first had it setup for feedback on the CERNOX_HX (24.5K).
When given an access to the hall, I powercycled the ITC_502 and then did IOC reboot. It worked. I changed back to feedback on the 2nd CERNOX. All back to normal.