>>> 'lpe2' problem from bob -- Thu Sep  7 13:28:27 1989 <<<

RE: Electrical Line Noise

Roy, of the electrical shop, PFM called. They are 
waiting to get a line monitor meter back from a factory 
calibration before they can check on the power to the
controller of lpe2. There is a similar job request from LSB
which is in the que before ours.  After that job they will 
be able to test our power line for fluctuations and noise. 
I will have Eleta turn in a work order with such a request. 
It may take 2 weeks or more befroe PFM can do this work. 
My contact there is Roy@2-2622.

This problem report will be cc'd to Eleta@janus for a
request to monitor an AC line in the Microlab and also
deleted from the e-stat board. I will have calendar mail
sent to myself to check on the progress of this order 
in 2 weeks.
s

>>> 'lpe2' problem from hsin -- Sat Sep  9 17:19:21 1989 <<<

When I clean the tube at weekend, because of slippy, tube hit the
sink in lberg furnace room.  The thin H2 flow tube inside the LPE
tube break at the joints at both ends.  Therefore it needs niner
quartz work to rejoin the two end joints back onto the LPE tube.

I think Bob can repair it within 20 min.  The two tubes are all O.K.
, just the joints at two ends break.  I leave everything before the
lberg furnaces.  I will come to see Bob first thing in Monday morning.

Wei Hsin

>>> 'lpe2' problem from bob -- Mon Sep 11 07:45:51 1989 <<<


RE: The failing of the programmable temp controller, lpe2.

Dan Carl called this AM to say that he would be turning on the
400 hp motor generator in the basement in 5 minutes. Phillip went in 
and programmed the contoller and lpe2 and we waited for Dan's
turn on. The controller failed at exactly our coordinated startup time.
The lights also dipped in the lab. These are on a different breaker
confirming the load effects a whole power riser, likely before
the step down transformer on the 5th floor. It is likely that
the Microlab is not the only unit effected in Cory Hall by
the startup of this unit. A solution will be investigated.

>>> 'lpe2' problem from gamelin -- Tue Sep 12 14:11:06 1989 <<<

LPE2 controller may have a faulty storage capacitor on one of
the main power controller boards which causes temporary loss
of power during line transients.  Phil is ordering a replacement
capacitor from the factory for us and will try to install it
next week (or the next convenient time between growths).

John Gamelin

>>> 'lpe2' problem from phillip -- Wed Sep 13 08:38:11 1989 <<<

The capacitors that are suspect in the 'data-trac' controller
have been ordered from the factory. Their ETA is one week from
today. A new digit display to replace a faulty unit was ordered
also. The cost of all the parts was approx.  $50.00.

>>> 'lpe2' problem from phillip -- Thu Sep 28 09:13:08 1989 <<<

P: Controller dumps on a.c. spikes.
S: Per factory; replaced marginal capacitor (C4 on print).
   Replaced faulty l.e.d. digit indicator. 

   Reset system to 890 dF.


  (Wei Hsin, please check the temp. setting asap to
   insure it is set correctly.)

>>> 'lpe2' problem from phillip -- Mon Oct  2 07:59:29 1989 <<<

H2 gas status:
#1= 2.1 Kpsi  #2=2.1 Kpsi  #3=1.9 Kpsi
1 bottle in reserve

>>> 'lpe2' problem from bob -- Fri Nov  3 14:02:58 1989 <<<

The H2 to lpe2 has been turned off and the hydrogen purifier has
been purged with N2. lpe2 is down.

>>> 'lpe2' problem from bob -- Mon Nov  6 15:52:40 1989 <<<

The H2 purifier on lpe2 has been turned on. It should be ready
for use in 1 hr.

>>> 'lpe2' problem from bob -- Mon Nov 27 15:28:52 1989 <<<

The H2 cylinders have been changed on the lpe furnaces.
There is currently 2200psi in the main regulator tanks and 2100 in the
reserve tank.

>>> 'lpe2' problem from bob -- Mon Nov 27 15:37:39 1989 <<<

rosal reported lpe2 had a green deposit on the surface of the quartz.
We have seen this occur over the years and it has not been a problem.
While changing the H2 bottles, I looked over this tube and found the
quantity of green material to be extremely large, much larger than
seen in the past. This leads me to believe some very major event has
occurred such as a fracture in the heat-pipe.

lpe2 should be profiled to check its temperature uniformity. Without
a working heatpipe, uniformity could become quit bad. It is possible
the heatpipe will have to be replaced to have a working system.

This message will be cc'd to Rosa Leon, lpe2's only current user.
She will have to run a quick check of temperature uniformity for 
a determination to be made.

>>> 'lpe2' problem from bob -- Wed Nov 29 07:01:57 1989 <<<

lpe2 is deamed operational in spite of the loss of it's heat pipe.
Processes performed by rosal do not require long, flat profiles.
