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User name Nue
Log entry time 22:00:17 on August 25, 2009
Entry number 181831
keyword=DZ power supply jumped
To check the correlation between ADC number and Current, I checked DZ PS
parameters in Monticiello. It claims "One Transister Fault" (Fig1).
I went down to Hall and see the PS and found set point is stable, but adc
is jumping around (Fig1).
SET 849999ch, ADC 71123 - 71225 ch (it is not increasing, just fluctuates)
SETPoint 425A, Readback 355.467A
I reported to Brad and talked with Bill. He thinks Transistor Fault is
not the problem and if there is problem he will take care tomorrow.
Currently DZ looks stable (Fig2).
SET 609519 ADC 60951-3
SETpoint 304.75970A, Readback 304.761A
I talked with Mike and he already noticed that PS cannot go beyond 360A
(cycling was made upto 425A during mapping, but today it's limited below
340A).
What I saw in Fig1 should be the moment power supply becomes unstable
around 355A. It should be fixed tomorrow.
A copy of this log entry has been emailed to: brads@jlab.org, reinhold@jlab.org, vulcan@jlab.org, spata@jlab.org
Figure 1
Figure 2
