Both defeats applied to T2 cooling package thermistors were removed today (Col. B interlock was jumpered, and the target water inlet and outlet signals had been swapped). It was confirmed that all thermistors are now wired correctly. The readback of both target water thermistors is currently unstable. Inspection of the Lemo connectors showed that the internal plastic parts of all connectors were damaged or missing. If the T1/T2 controls upgrade proceeds this shutdown, then all thermistors will be replaced with thermocouples, so after a decision is made on that project (sometime in Feb 2015) these thermistors will either be repaired or replaced. |