[Opera-CONNIE] vacuum pump status

[swagner at cbpf.br]

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
>>
>
>
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