[dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC

Tue Jul 28 10:04:07 EDT 2020

Dear DSG members,
    Please send us the cables color code for PDT332 to connect it back.

Regards,
Mohammad.

On Mon, Jul 27, 2020 at 20:37 <jpoudel at jlab.org> wrote:

> I am sorry to write again, but I have to inform to you all correctly. I
> wanted to write "cable from transducer pt332 is not attached to chassis but
> GUI is showing a large negative value. How?" Previus email was confusing
> (isn't is changed to is) so have to write again.
>
>
> On Jul 27, 2020 20:09, jpoudel at jlab.org wrote:
>
> PDT208 is working fine, the connection is good. I verified connection and
> connected it to chassis. Its showing quite reasonable reading also.
>
> PDT332( RTPC-DMS diff) is showing some weird number in epics GUI even
> before its connected to system. Cable from transducer is attached at
> chassis. How? I have no idea.( see attached) I think it should show zero. I
> compare PDT208(rtpc-buffer) reading removing cable from chassis, and it
> shows zero.
>
> In addition, Connecting wires at transducer PDT332 are coming out. So we
> need color code of cables before connecting it.
>
> Thank you,
> Jiwan
>
>
>
> On Jul 27, 2020 19:18, jpoudel at jlab.org wrote:
>
> Hello Marc,
>
> Can you please send me the connection of PDT 332 (color code of cables)
> also?
>
> In PDT 208, white and green are together. Are they -15V?
>
> Thank you,
> Jiwan
>
> On Jul 27, 2020 18:40, JIWAN POUDEL <jpoud001 at odu.edu> wrote:
>
> I will check the connections and verify it is correct before plugging in
> to chassis.
>
> Thank you,
> Jiwan
>
> On Jul 27, 2020, at 6:22 PM, mhattawy at odu.edu <mohammad.hattawy at gmail.com>
> wrote:
>
> Thanks Marc,
>    Maybe the beacon was on, but for sure the magnets are off.
> Unfortunately, I can’t get to the Lab till Wednesday. Jiwan can you connect
> it back?
>
> Mohammad
>
> On Mon, Jul 27, 2020 at 18:18 Marc Mcmullen <mcmullen at jlab.org> wrote:
>
> Hi Mohammad and Jiwan,
>
> I have replaced the fuse in the chassis and checked the internal
> components for issues. I did not reconnect the connector for the PDT 208
> (differential pressure DMS to RTPC) because I could not verify if the
> contacts are wired correctly since it was reconnected, because the magnet
> beacon is on. I have attached a pinout which can be used to verify
> connections prior to plugging it back into the interface chassis.
>
> Regards,
> Marc
> ------------------------------
> *From:* Marc Mcmullen <mcmullen at jlab.org>
> *Sent:* Friday, July 24, 2020 11:18 AM
>
> *To:* dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> *Subject:* Re: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>
> Thanks Mohammad,
>
> I'll look into the spares first. Then contact you about the repair.
>
> Regards,
> Marc
> ------------------------------
> *From:* dsg-hallb_rtpc <dsg-hallb_rtpc-bounces at jlab.org> on behalf of
> mhattawy at odu.edu <mohammad.hattawy at gmail.com>
> *Sent:* Friday, July 24, 2020 11:16 AM
> *To:* dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> *Subject:* Re: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>
> Hello Marc,
>     The magnets will be energized starting from 3:30 pm today to Monday
> morning. You won’t be able to get to the gas panel, that is within the
> fields of the magnets.
>
>
> Mohammad
>
> On Fri, Jul 24, 2020 at 11:11 Marc Mcmullen <mcmullen at jlab.org> wrote:
>
> Hi Jiwan,
>
> I am going to see if we have some spare supplies for that chassis. When I
> have the swap out in  hand, I'll need to coordinate with your group to
> complete the repair.
>
> The chassis will have to be de-energized and removed from the rack for
> repair. This means the MFC and the other connected sensors will have to be
> shut down while I make the repairs.
>
> Additionally, I will be doing this work either on the weekend or after
> hours, to avoid coming into contact with others.
>
> I'll let you know the status of the spares sometime today, so we can
> coordinate the system outage.
>
> Regards,
> Marc
> ------------------------------
> *From:* dsg-hallb_rtpc <dsg-hallb_rtpc-bounces at jlab.org> on behalf of
> Jiwan Poudel <jpoudel at jlab.org>
> *Sent:* Friday, July 24, 2020 9:33 AM
> *To:* dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> *Subject:* Re: [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>
> Hello Brian,
>
> Those power pins are not showing what it should show. Pin 6 and 5 showing
> -28.7V and pins 7 and 5 showing only 1.3V.
>
> Thank you,
> Jiwan
>
> On Jul 23, 2020, at 2:29 PM, Brian Eng <beng at jlab.org> wrote:
>
> Thanks Mohammad,
>
> Fortunately it already has the pinout on it.
>
> Unplug that connector and measure between pins 6 & 5 for -15 VDC, 7 & 5
> for +15 VDC. If those are good then it isn't power.
>
> Next open the backshell of that connector and connect probes to 2 & 12 to
> see if it is reading the same voltage as the cRIO (~4 VDC). If the reading
> at the sensor matches the cRIO it probably isn't the cabling.
>
> Lastly I would disconnect the detector and open the valves so that sensor
> is exposed to ambient pressure and see what it reads, if it's still ~400
> torr then it is most likely the sensor, but could be the cabling/chassis.
>
> To eliminate that possibility the sensor would need to be removed and
> tested on a bench using the same pins as listed above.
>
> I don't think we (DSG) have a direct replacement for that, so I'd try Hall
> B and if not you'd need to talk with Bob as that involves changing a
> pressure system component.
>
> ------------------------------
> *From:* dsg-hallb_rtpc <dsg-hallb_rtpc-bounces at jlab.org> on behalf of
> mhattawy at odu.edu <mohammad.hattawy at gmail.com>
> *Sent:* Thursday, July 23, 2020 1:21 PM
> *To:* dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> *Subject:* [dsg-hallb_rtpc] [EXTERNAL] Re: Pressure transducer of RTPC
>
> <image_123923953.JPG>
> <image_123923953.JPG>
> <image_6483441.JPG>
>
>
> On Thu, Jul 23, 2020 at 12:38 Brian Eng <beng at jlab.org> wrote:
>
> Hi Jiwan,
>
> The voltage being read back by the cRIO is ~4V which is being converted
> correctly to ~400 torr.
>
> Can you get the full model number of PT334 so I can better give some
> suggestions on what you guys could measure to help troubleshoot?
>
> Off-hand some of the things that could be wrong is: the sensor not getting
> proper supply voltage, a loose connection of the output to the cRIO as it
> is getting some voltage back, or a bad sensor (let's hope it isn't that as
> that was the only one we had in that range).
>
> ------------------------------
> *From:* Jiwan Poudel <jpoudel at jlab.org>
> *Sent:* Thursday, July 23, 2020 11:20 AM
> *To:* Brian Eng <beng at jlab.org>
> *Cc:* dsg-hallb_rtpc at jlab.org <dsg-hallb_rtpc at jlab.org>
> *Subject:* Pressure transducer of RTPC
>
> Hello Brian,
>
> RTPC abs. Pressure transducer seems not working properly. This should show
> around 760 torr (~ 1 atm), but showing about 400 torr only. What could be
> the reason?
>
> Thank you,
> Jiwan
>
>
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> --
> Best regards,
> Mohammad Hattawy.
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>
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>
> --
> Best regards,
> Mohammad Hattawy.
> _______________________________________________
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> dsg-hallb_rtpc at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc
>
> --
> Best regards,
> Mohammad Hattawy.
> _______________________________________________
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> dsg-hallb_rtpc at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-hallb_rtpc
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>
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>
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-- 
Best regards,
Mohammad Hattawy.
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