On Wednesday August 15th the T1 cooling package tripped off, and could not be restarted.  On the EPICS screen the pump device went into an immediate time-out each time we attempted to turn it on.  An electrician was involved in the debugging, and issues were found with the 480V supply.  The breaker switch in the 480V supply panel was found to be damaged, and was replaced.  The relay in the contactor box for the pump motor thermal protection was also replaced.  These new parts did not solve the problem.  Resistance measurements between the phases of the pump motor revealed ~10ohms between phases A-B, but ~250ohms from B-C and A-C (measured from inside the contactor box).  The T2 pump and a spare replacement pump were also tested, and had ~10ohms between all phases.  It was therefore concluded that the pump motor, or possibly the wiring between the contactor and motor had failed.  The T1 cooling package was uncovered and drained by the end of the day.

On August 16th the old pump was disconnected and de-wired.  Damaged wire insulation on the pump motor was found, which likely caused a short, leading to failure of the pump motor, and cascading failures of the electrical system and possibly also the control PLC.  A spare pump (Chempump GB-3K-1S) was installed with custom cut gaskets.  The pump was re-wired by an electrician.  The cooling system was re-filled, and start-up was attempted, however there were remaining issues with the electrical system.  By the end of the day various testing by Controls Group and Electrical Group determined that the pump motor contactor also had failed and required replacing.

On August 17th the contactor and over-current protector were replaced by an electrician.  When the breaker was switched on the pump unexpectedly started immediately.  This was found to be caused by the control system drive signal module being faulty causing the output to be stuck on.  Failure of this module may have been caused by excessive current draw due to the damaged contactor.  The failed module was replaced, and the PLC and IOC were both restarted.  After this the system worked normally.  The pump was inspected by Maico Dalle Valle, no leaks were observed and operation seemed normal.  Shielding above the cooling package was replaced, and BL1A was restarted.  Cyclotron Fault #11527 was returned.

A new spare contactor and over-current protector have been ordered (Allied Electronics LC1D09BD and LRD12, Requisition #1037940).  These will be labeled and given to the Electrical Group.  A new spare T1 / T2 pump has also been ordered (Chempump GB-3K-1S, Requisition #1038041) which will be stored in the RH Meson Hall Hot Cell Lab Tool Port Boot Box Area.

A data sheet and quote for the replacement pump are attached.