 Thu Aug 17 19:45:27 2006, Willy Andersson, Quench Recovery, switch to series cooling
|
Temps of flow returning from solenoid flat lined at about 10K.
Gradually closed CV155.
Then switched to series cooling. |
|
Thu Oct 12 11:53:04 2006, Willy Andersson, Quench Recovery, Compressor trip, 09:50 this morning.
|
Main compressor tripped, refrigerator shutdown. Checked with experimentors
and main control room, no indications of power bump etc.
Restarted compressor, // warm then // cold return. One of the MV5x valves
frozen open, had to de-power valve a couple of times to get it to seal. |
|
Thu Oct 12 19:54:10 2006, Willy Andersson, Quench Recovery, Energized solenoid.
|
Switched to series mode about 6 hours ago. Cooling continued including
power leads until LHe level at about 50% and powerleads appeared stable. |
 Fri Oct 13 00:13:57 2006, Experimentor, Quench Recovery, Energized solenoid.
|
Hi there,
This is Khashayar (experimenter). Lookin at all different temperatures and
levelson the monitor, it seems everything is stable now. I wonder if you
could let us know what time we can have beam again? Would you please send an
email to kghandi@mta.ca if you know the answer? You can also reach me at my
cell# (506)961-0802 any time.
Thanks
Khashayar
> Switched to series mode about 6 hours ago. Cooling continued including
> power leads until LHe level at about 50% and powerleads appeared stable. |
|
Thu Oct 26 04:27:31 2006, Willy Andersson, Quench Recovery, Powerlead overtemp
|
02:30 this morning got page from operations.
Looked at system online, appears that there was a powerlead overtemp
that caused the quench. Compressor still running. After arriving to
work set system to // warm return mode to cool down transferlines. Lhe
level starts to boil away. Switch to // cold return mode. Discovered that
seem to get better cooldown rate by not opening supply valves to solenoid
fully. // cold return valves are fully open but both CV143 and CV146 are
only open to 0.55 giving mu1 and mu2 inlet pressures of 2 barA. Getting
good cool down rates and even building LHe level.
04:25 C1 down to 8K, C12 at 7.5K, C6 at 7.5K, 6KS_M at 10.5K |
|
Thu Oct 26 04:34:15 2006, Willy Andersson, Quench Recovery, Still in // cold return mode.
|
Leaving system cooling in // cold return mode, cooldown rates still good.
Had flow on to powerleads since re-starting cooling flow to solenoid.
Either I (when I return to work later this morning) or Doug will do the
switch to series mode. |
|
Thu Oct 26 08:18:10 2006, Doug Preddy, Quench Recovery, switched to series mode
|
Switched to series mode at about 7:45. |
|
Thu Oct 26 11:45:22 2006, Doug Preddy, Quench Recovery, Solenoid cold
|
power leads cold 50% liquid.
Turning on power supply |
|
Thu Oct 26 14:14:57 2006, Doug Preddy, Quench Recovery, power lead quench
|
solenoid tripped on power lead temp. I was here and caught it. System
cooling. |
|
Tue Oct 31 03:52:29 2006, Doug Preddy, Quench Recovery, power lead quench at 2:30 this morning
|
Compressor still on. Starting flow to solenoid |
|
Tue Oct 31 05:36:14 2006, Doug Preddy, Quench Recovery, switch to series mode
|
|
|
Tue Oct 31 08:37:34 2006, Doug Preddy, Quench Recovery, Energizing solenoid
|
|
|
Wed Nov 15 11:09:28 2006, Doug Preddy, Quench Recovery, Compressor tripped off
|
Compressor tripped this morning at ~8:45. I restarted the compressor, but
turbine 1 would not spin up. I let it warm for an hour and it started. I
started flow to the solenoind in parallel cold return. |
|
Wed Nov 15 13:56:00 2006, Doug Preddy, Quench Recovery, switch to series mode
|
|
|
Wed Nov 15 17:05:49 2006, Willy Andersson, Quench Recovery, powerleads cold, energizing solenoid
|
Powerlead temperatures have bottomed out, energizing solenoid to 300
amps, ramp rate 60. |
|
Tue Nov 28 10:32:04 2006, Doug Preddy, Quench Recovery, recovering after looong power outage
|
The power has been out for about 24 hours. Recovering coldbox, solenoid and
beamline vacuum.PLC is down for the vacuum system. Started compressor and
am flowing warm helium through the soleniod to warm it up while the vacuum
recovers. |
|
Fri Apr 27 10:16:44 2007, Kevin Trithardt, Quench Recovery, Test
|
Don't Panic -- There was no quench. I am testing the e-log.
I have added Kevin's name and e-mail to the M9 e-log. He will be e-mailed
when a quench recovery log is submitted. His name is also included in the
Author's list.
Thanks, Doug |
|
Fri Apr 27 10:32:07 2007, Doug Preddy, Quench Recovery, Reset quench relay logic box
|
The quench relay logic controller was not functioning correctly. It showed
a "Trip" light and no other lights. I cycled the power to the controller
and it now seems to be working properly. This did cause a quench and I am
now recovering the system. |
|
Wed May 30 08:38:38 2007, Doug Preddy, Quench Recovery, Solenoid quenched this morning
|
Solenoid quenched this morning on power lead temp (I believe).
I restarted it at ~7:00, but the capacity control for the compressor would
not respond. I shut the system back down and checked as many relays as I
could. I then restarted the system and it is now cooling. I will go
through the wiring diagrams and see if I can locate the bad relay. |
|
Wed May 30 11:27:32 2007, Doug Preddy, Quench Recovery, Problems recovering
|
Various start up problems :
MV51 stuck open. Finally got it closed by hitting the valve with a hammer.
Vacuum is bad in cold box as MV902 tripped closed.
Vacuum in solenoid has gone bad. Suspect boil off from inside solenoid. So
far it is not recovering.
Previously T1 would not spin up - frozen. |