Troubleshooting the T2 Collimator B water out temperature (T7) by swapping it's analog signal in PIE box #2 with T2 Collimator A water out temperature (T6) to see if problem follows. See if unplugging T7 signal causes Safety Page SV7 1A Collimators error signal goes okay.

 

Tony Tateyama  2014-10-14 11:29:36
PIE box channel for T7 appears to be okay as a known good level signal (T6) was connected, and channel warning & trip went okay. Safety Vertical page SV7 1A Collimator signal went okay after removing bad signal from PIE box, and resetting trips on two panels at T1/T2 racks. It appears that the sensor for T7 has become faulty.

 

See interlock defeat #7128

Approved by Doug Preddy

Shorting 2 pin lemo plug K3 of #1 046418 Interlock units in Rack 1-A south side mezzanine in the Meson Hall. Cable # 12708 to removed to insert short.

 

Will look into replacing the faulty Thermister in the 2015 major shutdown.