[Opera-CONNIE] vacuum pump status

[Herman P Lima Jr]

Hi all,

I just talked to a mechanical engineer here at CBPF - Alexandre Mello.
Actually, he has the same vacuum pump here in his lab, and it is also
broken!

If the problem is really the BACKING PUMP, he proposed that we use a
mechanical pump available here to replace the one broken. It is not the
same pump, but it would do the job.

The replacement is not plug-and-play because of adaptors needed between the
pumps. We would need first to buy a longer pipe (that is easy) and also the
adapters for both ends.

There is also a restriction concerning the operation of this new pump,
since it could send oil back to the system! What would be a disaster of
course. There must be a automatic valve between the pumps that would
prevent it to happen.

Let's discuss that in more detail next week in a meeting.

Herman

2015-01-16 11:29 GMT-03:00 Martin Makler <martinmakler at gmail.com>:

> Hi Juan.
>
> That's what I was wondering.
> Can you send me some specifications so that I can look for a pump that
> could do the job?
>
> Cheers.
>
> Martin.
>
> On Jan 16, 2015, at 12:21 PM, Juan Estrada <estrada at fnal.gov> wrote:
>
> > Is there a pump at CBPF that we could borrow?
> >
> >> On Jan 16, 2015, at 7:40 AM, Guillermo Fernandez <
> fmoroni.guillermo at gmail.com> wrote:
> >>
> >> Pamela, Alejandro and Stephan, thanks for all the work. It has been a
> lot.
> >> Kevin and Andrew, thanks a lot for all the support from Fermilab. It
> was very important for the operation.
> >> It is the second time we need to face a big problem with the detector,
> and I think in both cases the response was good.
> >>
> >> Regards,
> >> Guillermo
> >>
> >>
> >>
> >>
> >>
> >>> On Jan 16, 2015, at 9:10 AM, swagner at cbpf.br wrote:
> >>>
> >>>
> >>> Dear all,
> >>>
> >>> we checked the vacuum pump again today and followed the suggestions.
> We unmounted the protection cover over the fan. When we tried to move it
> manually, there was heavy resistance and it was difficult to turn at some
> points. We left it in a position where it was more easy to move and
> switched the pump back on and it was working. Before reassembling
> everything again we switched the pump on various times for a short amount
> of time and occasionally it stopped working again. Moving the fan against
> the resistance again solved the problem temporarily.
> >>> At the times when the pump was running there was a strange sound
> hinting to some internal friction. Probably there is either a problem in
> the motor or there's something wrong with the diaphragms.
> >>>
> >>> For the time being we decided with Guillermo to reassemble the pump
> again and wait for further suggestions from Fermilab. We will leave Angra
> today. Alejandro and Pamela will come to Angra again next week and try to
> fix the pump then when new information is available.
> >>>
> >>> Cheers,
> >>>
> >>> Stefan, Alejandro and Pamela
> >>>
> >>>
> >>>
> >>> Quoting Guillermo Fernandez <fmoroni.guillermo at gmail.com>:
> >>>
> >>>> In fact the capacitors look they come with the case and cables from
> factory:
> >>>>
> >>>>
> http://www.electronicon.com/index.php?partno=E33.C78-500805%2F27E151&partnosubmit=Search+%C2%BB&id=423&L=1&search=partno
> >>>>
> >>>> I found I have a similar capacitor in a water pump I bought two weeks
> ago (attached). I think it would be a good idea to try to remove the
> capacitors and take them to Rio to test them. let's take several pictures
> of the place they are connected and the way the fuse box is organized. I
> assume none of the cables from the capacitors go directly to the motor.
> There should be a terminal block inside the box.
> >>>>
> >>>> Also, Andrew from Fermilab, suggests to try to move the shaft. You
> can do it from the back of the backing pump. It has a fan, after removing
> its red cover. The cover is removed unscrewing a few screws. He tried first
> this at Fermi, these were his words:
> >>>>
> >>>> "you should feel the vacuum stroke. Easy movement then resistance on
> the valve closing"
> >>>>
> >>>>
> >>>> Pamela, Alejandro and Stephan:  again, thanks a lot for all the work.
> In all this craziness of trying to do as many things as possible we may
> forget to say thanks.
> >>>>
> >>>> Guillermo
> >>>>
> >>>>> On Jan 15, 2015, at 4:35 PM, Guillermo Fernandez wrote:
> >>>>>
> >>>>> Hello,
> >>>>>
> >>>>> unfortunately, the fuses in the backing pump were not the problem.
> Alejandro, Pamela and Stephan, after checking that the fuses were ok, tried
> to start the pump again in 115 and 230V, but the motor didn't start. In
> both cases the green light of the switch was on. They also measured the
> current for 115V, it was 2A.
> >>>>> They tried to take apart the capacitors, but it was not possible
> from outside. If we decide to remove them, we need to disconnect the cables
> from inside the fuse box. They took a couple of pictures of the capacitor
> model.
> >>>>> I told them to assemble the pump again, and leave it on the bench.
> >>>>> They will stay until tomorrow in Mambucaba. If no other suggestion,
> they will return to Rio tomorrow.
> >>>>>
> >>>>> Guillermo
> >>>>
> >>>>
> >>>> --
> >>>> Mensagem Verificada pelo AntiSpam CanIt CBPF
> >>>> --
> >>>
> >>>
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