Thanks Matthys. We certainly should get the Frigotech out there as soon as we can in Jan. It does sound like a leak somewhere in the system is the problem though, so we “just” need to find it. We’ll monitor as best we can and hope that it manages to keep charged through the holidays. What is Neels’ schedule? Is he on-call at home in Carnarvon? Coming in regularly to Klerefontein? Staying/going regularly up to site?
Thanks again! Dave > On Dec 19, 2014, at 4:19 AM, Matthys Maree <[email protected]> wrote: > > No leaks found. > Fans do go on. > > > After I added gas, I witnessed a lot of cycles of the cooling unit, and it > was working fine the whole time I was there. > I last checked again around 13:00SA time, and it was still working fine. > > William, I think we should get that Frigotech guy who was working on the > system recently, back here to see what is going on. (early January 2015) > > > Please note that this cooling unit is still at risk, because I did not fix a > problem, I think I just postponed a problem. > I will suggest you try and keep the heat load as low as possible inside > Container, and as soon as you see temp rising, to turn off as much as you can > remotely. > It is very hot outside(40degC), and temperatures inside container really get > very high if things go wrong. > > I will still be around beginning next week, but if there are similar issues > after this, please email the standby infrastructure technician, Neels > Hoek([email protected] <mailto:[email protected]>), and ask him to turn off power > to PAPER Container, and then we will only be able to look further into this > in the new year. > > > > Groete > > Matthys Maree > SKA South Africa – Carnarvon > > Tel: 021 506 7300 ext.#1035 (Carnarvon, Klerefontein) > Web : www.ska.ac.za <http://www.ska.ac.za/> > > From: William Walbrugh [mailto:[email protected] <mailto:[email protected]>] > Sent: 19 December 2014 09:46 AM > To: Matthys Maree > Cc: PAPER List > Subject: RE: Cooling > > Hi Matthys, > > That's good. > > Could you detect any leaks (should leave an oily residue)? > > Also, did you witness the condenser fans outside going on? > > Best regards, > William > > On 19 Dec 2014 9:40 AM, "Matthys Maree" <[email protected] > <mailto:[email protected]>> wrote: > OK, I try to push in some gas into system. > Seems to be cooling now. > > I did turn on all that I could manually from inside the Paper Container. > I will monitor for a while today to see if it manage to keep things cool > inside. > > Groete > > Matthys Maree > SKA South Africa – Carnarvon > > Tel: 021 506 7300 <tel:021%C2%A0506%207300> ext.#1035 (Carnarvon, > Klerefontein) > Web : www.ska.ac.za <http://www.ska.ac.za/> > > From: [email protected] > <mailto:[email protected]> > [mailto:[email protected] > <mailto:[email protected]>] On Behalf Of danny jacobs > Sent: 18 December 2014 05:53 PM > To: PAPER List > Subject: Fwd: Cooling > > > ---------- Forwarded message ---------- > From: Matthys Maree <[email protected] <mailto:[email protected]>> > Date: Thu, Dec 18, 2014 at 8:12 AM > Subject: RE: Cooling > To: danny jacobs <[email protected] <mailto:[email protected]>> > > OK Danny > > I will only be on site tomorrow again, and try to see if I can get it cool > again. > Lets hope it is something easy. > > > Groete > > Matthys Maree > SKA South Africa – Carnarvon > > Tel: 021 506 7300 <tel:021%C2%A0506%207300> ext.#1035 (Carnarvon, > Klerefontein) > Web : www.ska.ac.za <http://www.ska.ac.za/> > > From: danny jacobs [mailto:[email protected] > <mailto:[email protected]>] > Sent: 18 December 2014 04:11 PM > To: Matthys Maree > Cc: PAPER List > Subject: Re: Cooling > > Danke Matthys! > > We don't have auto-shutdown on all racks partly because we can't bring it > back remotely and partly because the temperature box is not in the power > control loop. The ideal situation would turn off everything but a core of > absolute necessities (paper1, the switch, and the nti box are my first > choices). We'll look at our heat budget and try to come up with a 90% > shutdown solution. > > If you can turn on the three things I mentioned, we'll be able to monitor the > temperatures remotely. > > Thanks, > ~Danny > > On Thu, Dec 18, 2014 at 4:34 AM, Matthys Maree <[email protected] > <mailto:[email protected]>> wrote: > Hi > > I still struggled to get the PAPER container temperature below 40degC, and > had to turn off all racks. We still did not find the problem on the cooling > units. > I will attempt to re-gas this unit tomorrow when I have the required gauges > and stuff, and hopefully it will run for a while. > > This might be risky, because our staff will be away for most of the time > between 24th Des and 5th Jan, and now that we know this unit is not 100%. > > Is it possible to implement an auto shutdown of all rack when air temp reach > a certain value? > This work pretty well on one of our other containers. > > Let’s see how things go tomorrow, and I will keep you up to date on my > progress and findings. > > > Groete > > Matthys Maree > SKA South Africa – Carnarvon > > Tel: 021 506 7300 <tel:021%C2%A0506%207300> ext.#1035 (Carnarvon, > Klerefontein) > Web : www.ska.ac.za <http://www.ska.ac.za/> > > > > -- > > National Science Foundation Fellow > Arizona State University > School of Earth and Space Exploration > Low Frequency Cosmology > Phone: (505) 500 4521 <tel:%28505%29%20500%204521> > Homepage: http://loco.lab.asu.edu/danny_jacobs/ > <http://loco.lab.asu.edu/danny_jacobs/> > > > -- > > National Science Foundation Fellow > Arizona State University > School of Earth and Space Exploration > Low Frequency Cosmology > Phone: (505) 500 4521 > Homepage: http://loco.lab.asu.edu/danny_jacobs/ > <http://loco.lab.asu.edu/danny_jacobs/>
