 Wed Aug 25 07:47:05 2004, Doug Preddy, Normal Running, Power lead flow
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The power lead flows had dropped to 210 mm this morning. I increased HIC142
from 0.8 to 0.83. The flows are back to <250 mm and the temps are back to
LHe in-10.8, PL-Pos-11.1, PL-Neg-8.9 |
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Tue Aug 24 12:09:50 2004, Doug Preddy, Normal Running, The past few days
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The solenoid has been re-started as of August 19. It was cooled down and
energized over the weekend. Sunday night at 9:30 it tripped due to
negative power lead going above it's set point. The system stopped flow to
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Thu Aug 19 10:28:32 2004, Doug Preddy, Start Up, after M9bv5 FIX
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Over the last couple of days we replaced the gate on the M9BV5 valve. The
old one had worn the teflon sliders on the sides. Metal shavings on bottom
of body. Found a replacement with metal rollers, rather than slides.
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Sat Aug 7 23:40:47 2004, Willy Andersson, Quench Recovery, Energizing solenoid
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23:39 Powerleads cold, LHe level over 40% and rising. Energizing solenoid
to 500 Amps, ramp rate 60. Checking compressor building then going home. |
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Sat Aug 7 22:37:04 2004, Willy Andersson, Quench Recovery, Compressor tripped off.
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Got a call at about 10:00 this morning, the whole system had tripped off.
No power bumps or other disturbances. When I arrived the only fault
indications were "ColdBox Trip" light on the compressor panel and on the
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Thu Jul 29 13:25:29 2004, Doug Preddy, Quench Recovery, start flow to power leads
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Thu Jul 29 09:01:11 2004, Doug Preddy, Quench Recovery, switched to parallel cold
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| Changed to series mode. |
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Wed Jul 28 23:07:01 2004, Doug Preddy, Quench Recovery, solenoid cooling
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| cooling rates for the solenoid are good. In parallel cold return. |
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Wed Jul 28 22:01:31 2004, Doug Preddy, Quench Recovery, Starting flow to solenoid
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| c1 28, c12 29, c6 11.6, c7 12.5 TI121 22.5 |
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Wed Jul 28 21:26:19 2004, Doug Preddy, Quench Recovery, Double Power bump
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Two power bumps tonight. Everything tripped of. Restarted cooling water
pump, diff. pump under solenoid etc. Computer stayed on! Starting
compressor. |
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Wed Jul 28 07:00:18 2004, Doug Preddy, Quench Recovery, switch to series mode
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| Switching to series mode. Jumper on vacuum gauge removed. |
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Wed Jul 28 00:04:30 2004, Doug Preddy, Quench Recovery, started flow to solenoid
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Solenoid temps were: C1 & C12 about 30K. C6 &C7 about 11K. Started flow to
solenoid in parallel cold return. Jumpered out the vacuum gauge for the
solenoid vacuum. |
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Tue Jul 27 23:33:27 2004, Doug Preddy, Quench Recovery, Solenoid quench 9:30
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I was phoned at about 9:30 tonight with a solenoid alarm. After looking at
the display I found the system to be tripped off. When I came in I found
the compressor off and the solenoid quenched. There was no real indication
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Tue Jun 29 14:59:46 2004, Willy Andersson, Normal Running, Removed jumper on vacuum controller.
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Tuesday 14:55
Removed jumper on back of PIC 901. This jumper should be off during
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Fri Jun 25 14:20:58 2004, Willy Andersson, Quench Recovery, Switch to series mode
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At about 14:00 solenoid temps dipping below 8 K. Trace of LHe level (dense
gas) starting to show. Switching to series cooling mode. |
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Fri Jun 25 12:36:04 2004, Willy Andersson, Quench Recovery, Compressor unloaded etc.
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At about 09:30 this morning I noticed the sound coming from the compressor
building seemed louder than usual. After entering the building I noted that
the compressor was unloaded to about 50% and the compressor suction was
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Fri May 21 09:27:39 2004, Doug Preddy, Maintenance, Idle mode
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Power supply was ramped down yesterday as there are no users.
The Sundance server was rebooted yesterday. This morning the displays were
all white screened, so I restarted the session. The computer was running
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Thu May 6 09:32:13 2004, Willy Andersson, Quench Recovery, Additional notes from last night power lead problems.
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When performing last nights refrigerator adjustments I also increased the
compressor discharge pressure to 11.25 barA. Also the backup air compressor
was tripped off again and I reset it. Finally I opened the city water flow
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Wed May 5 23:57:38 2004, Willy Andersson, Quench Recovery, Powerleads warming up again. 
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Got a page from Don Flemming at about 18:50 wondering why the power
lead temperatures were rising. See attachment may5_04_1800.BMP It looked as
though the monitoring signals flat lined for about 2 hours for some reason.
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Wed May 5 12:13:51 2004, Doug Preddy, Normal Running, power leads cold
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| should be ready to run. |