[Dsg-hallb_magnets] [New Logentry] Investigation of Solenoid Fast Dump

[campero at jlab.org]

Logentry Text:
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Solenoid tripped from 1208 A after being stable for ~ 5 hrs.
Investigation of the causes for the Solenoid fast dump revealed that fast dump occurred due to an oscillating differential of pressure between the supply and return LCW signal.
Checked the SOE timestamp EPICS screen and noted that the MPS internal status bit associated with the MPS Water Flow tripped first (20:13:57.58) and then it triggered the QD unit 1 ch#2 upper and PLC software quench detector to trip. 
First oscillation of the LCW differential of pressure was noted was around 17:13 hrs.
Below check the screenshots of the EPICS screens and the data archived.

After clearing all interlocks, we did an attempt to ramp the magnet to 25 A and tripped again due to the MPS water flow as a consequence of the unstable LCW signal.


 


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