 Thu Nov 4 13:33:49 2004, Doug Preddy, Normal Running, Power supply problems
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Last night the power supply was ramping up at a very slow rate. This
morning it was energized,but with no current even though the limit was set
to 500 amps. Klaus R. found the pot. that set the current limit was bad.
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Mon Nov 29 09:28:16 2004, Doug Preddy, Normal Running, Buffer tank empty
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Came down to check on system. CV211 was fully open, trying to charge the
system. Ripples on LHe in and PL neg. CV141 fully closed. I closed CV147 to
0.45 to try and move CV141 open. Checked the buffer tank pressure, it was
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Wed Dec 1 12:55:56 2004, Doug Preddy, Normal Running, added one bottle helium gas
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| buffer tank pressure is up to 6.5 psi. |
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Thu Dec 2 10:51:16 2004, Doug Preddy, Normal Running, power lead ripple
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Ripples got worse overnight.LHe in 10.3-11.7, PL Neg 8.0-8.7. Flows <200mm.
cycled CV142. Flows 240mm. LHe in 10.3-11.3 PL Neg 7.9-8.1 |
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Sun Dec 5 11:15:24 2004, Doug Preddy, Normal Running, more ripples
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I loked at the power lead temps this morning. LHe_in 10.4-12.0 PL-Neg 8.0-
9.0 PL-Pos 9.8-10.4. Flows down to 160mm. Called Ops and got Danica to
cycle CV142. Ripples and flow improved on the second try. |
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Tue Jun 14 18:48:14 2005, Experimentor, Normal Running, Power bump at 18:40
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Solenoid tripped on a power bump at 18:40 Tuesday
-- Donald Arseneau |
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Sun Aug 14 10:03:13 2005, Willy Andersson, Normal Running, System stable
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No experiment running in M9B.
Solenoid current is zero and power supply not armed.
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Tue Nov 15 07:25:10 2005, Doug Preddy, Normal Running, power supply problem
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Saturday November 12 the solenoid power supply ramped itself down to zero.
It would not ramp up unless the ramp rate was set to 30 minutes. At this
setting the power supply ramped up to the required current. It seems to
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Tue May 30 14:36:41 2006, Doug Preddy, Normal Running, power leads warming
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| power leads warming. closed HIC 142, then re-opened. temps falling |
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Fri Jun 16 08:12:04 2006, Doug Preddy, Normal Running, LI108 indicates high on EPICS screen
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| LI108 indicates high on EPICS screen (150%) Controller shows ~64% |
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Fri Jun 30 11:13:00 2006, Doug Preddy, Normal Running, E-log is back up and running
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| I would have made an entry when it died, but----- |
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Fri Jun 30 11:17:57 2006, Doug Preddy, Normal Running, Solenoid recovered
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Tuesday night. June 27, 2006, the solenoid quenched for no apparent
reason. It was restarted Wednesday morning. The vacuum in the solenoid
went away (up to 8 Torr). This was found to be a result of a leaking
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Thu Jul 6 15:00:15 2006, Doug Preddy, Normal Running, test
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Thu Jul 6 15:04:17 2006, Doug Preddy, Normal Running, test 
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| test |
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Thu Aug 10 08:33:44 2006, Doug Preddy, Normal Running, Running low on helium
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Temperture okay, but there are fluctuation in the power leads. PIC229 is
trying to charge. The buffer tank pressure is just >0 psi. I will lower the
liquid level to 40% to allow some helium to boil off into the buffer tank. |
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Sun Oct 15 07:09:41 2006, Other, Normal Running, cryopump bcp2 trip
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Donald Arseneau reporting
Not really solenoid realated, but FYI...
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Fri Nov 3 12:09:51 2006, Doug Preddy, Normal Running, Fine tuning
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The power lead temperatures have been climbing at a rate of ~ 0.02K very 8
hours. The negative lead started to show some rippling this morning. The
positive flow had dropped from >250mm to 240mm. I cycled CV142 and the
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Tue Nov 7 10:35:32 2006, Doug Preddy, Normal Running, Maintenance day
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I ramped down the solenoid power suplly and shut off flow to the power
leads. I will allow them to warm up and (hopefully) recover the flow rates.
I am also regenerating the M9BCP@ cryopump. |
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Fri Apr 27 10:10:07 2007, Doug Preddy, Normal Running, Solenoid Cold
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| Solenoid cold, power leads cold. Alarm handler started. |
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Mon Apr 30 09:30:26 2007, Doug Preddy, Normal Running, problems over weekend
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The PLC Limit switch power supply was tripped off on Saturday. I came in
and reset it and restarted all the vacuum systems that had tripped off.
The power leads were found to be warming up. This morning they were at ~
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