[Hallb-engineering] DynaPower Box Supplies

burkert burkert at jlab.org
Thu Jan 13 08:24:17 EST 2011

To be more specific.
The mini-T is required towards the end of the run period that starts 
November 7, 2011 and ends  May 12,  2012. If this run with the mini-T 
will indeed happen depends very much on the outcome of the electron test 
run that is currently planned for the week before the 6 month shut down 
that begins in May 2011.  Given the status of HDice project this 
schedule is quite uncertain. Once we know more about the prospects of 
HDIce we will need to revisit the entire remaining schedule for the 6 
GeV era until May 12, 2012. For now we assume the mini-T is needed in 2012.

On 1/13/11 6:47 AM, Doug Tilles wrote:
>    From what I understand the Mini T will be use for HDice in the second
> half Electron run? Please confirm.  DOUG
> On 1/12/2011 3:02 PM, Krister Bruhwel wrote:
>> Thanks Eugene.  The MiniT power supply has a ZFCT in it that we could
>> commender if needed (have to verify compatibility).  Will we use the
>> Mini-T supply along with the Moellers before the upgrade?
>> Krister
>> Eugene Pasyuk wrote:
>>> HDIce run will need Moeller.
>>> -Eugene
>>> On 1/12/11 2:40 PM, Krister Bruhwel wrote:
>>>> Does anyone know when we will need both Moellers again?  If we don't
>>>> have an experiment that uses them before 12 GeV (or something like
>>>> that), it would delay the time period before this thing could reach
>>>> critical mass ... If not, we will need to secure a spare for the short
>>>> term or accept the risk.
>>>> Thanks,
>>>> Krister
>>>> Krister Bruhwel wrote:
>>>>> Hello,
>>>>> Peter Abele just emailed me and that is his option number three ... I
>>>>> wonder what accuracy we really need for these supplies.  Here is his
>>>>> email:
>>>>> Mr. Bruhwel:
>>>>> I spoke with a couple of our engineers a short time ago and came up
>>>>> with
>>>>> a few ideas on how to proceed on this matter.  With the idea of some
>>>>> possible reduction n accuracy being considered it does open up some
>>>>> options on how to move ahead so with this in mind the following options
>>>>> were mentioned:
>>>>> 1.      A standard shunt with isolation amplifier: This would be the
>>>>> simplest arrangement which would use the most commonly available parts
>>>>> and be the least expensive and complicated to implement.  The finished
>>>>> result would offer a roughly ¼% accuracy.
>>>>> 2.      A hall effect CT assembly:  These are a bit more difficult to
>>>>> implement than a shunt but less costly that a high accuracy ZFCT type
>>>>> current monitoring device.  The finished result would offer a
>>>>> roughly ½%
>>>>> accuracy.
>>>>> 3.      A similar device to the ZFCT as built by another manufacturer:
>>>>> This option would take some work to get the electrical and mechanical
>>>>> details worked out and would be your most expensive option moving
>>>>> forward, but would offer similar performance to the ZFCT you currently
>>>>> installed on these power supplies.
>>>>> Please let me know if you think anything other than option 3 might be
>>>>> viable for you application and we can investigate accordingly.  Also,
>>>>> please provide information about the exact power supplies in
>>>>> question so
>>>>> we can understand the ratings of what was built originally and what
>>>>> would be involved in a retro-fit installation of these devices.
>>>>> Thanks.
>>>>> Peter Abele
>>>>> Senior Sales Engineer
>>>>> John Segal wrote:
>>>>>> Danfysik spun off the transducer portion of their business.  You still
>>>>>> go through GMW for it, though.
>>>>>> Bill Merz wrote:
>>>>>>> If the problem is that you need a replacement transductor head or
>>>>>>> electronics you should be able to purchase something from Danfysik as
>>>>>>> a drop in as long as the "Current signal" is compatible with the
>>>>>>> Dynapower regulator. You would need to buy a complete
>>>>>>> system...transductor head and electronics, but it should just work
>>>>>>> fine. Hitek also makes a precision transductor which may also work if
>>>>>>> you need 10PPM type of performance.
>>>>>>> Bill
>>>>>>> On 1/12/2011 2:00 PM, Krister Bruhwel wrote:
>>>>>>>> Hello,
>>>>>>>> I had a ZFCT chassis fail in November of 2010 on one of our Moeller
>>>>>>>> Power Supplies (8000A 40V).  As our spare needed a mounting bracket
>>>>>>>> that wasn't included, I robbed the chassis from an unused supply
>>>>>>>> (the downstream Moeller because we are running TPE) .  Upon asking
>>>>>>>> DynaPower for repair/replacement, I was met with some ambiguity and
>>>>>>>> they would look into the problem.  Today I talked with Peter Abele,
>>>>>>>> the Senior Sales Engineer, and his message was that they are still
>>>>>>>> in the power supply business but they can no longer repair or
>>>>>>>> manufacture the ZFCT chassis' or heads.  He will work with us on a
>>>>>>>> long term solution of trying to retrofit something (undefined as of
>>>>>>>> yet) or using shunts if the accuracy is sufficient.
>>>>>>>> This message may impact anyone that needs to support a box supply
>>>>>>>> from DynaPower.  At present Hall B does not have a spare ZFCT
>>>>>>>> chassis.  After I get a bracket made, I will need to test the unused
>>>>>>>> spare, to ensure we can use both Moellers for upcoming experiments.
>>>>>>>> If anyone has a ZFCT chassis that I can use as a spare, please let
>>>>>>>> me know.   If anyone knows of options that we can utilize in the
>>>>>>>> short or long term, please let me know.   Its important for Hall B
>>>>>>>> to understand that this may affect experiments in the future as we
>>>>>>>> have no spares at present.
>>>>>>>> These supplies are to be used through the 12GeV upgrade and a long
>>>>>>>> range solution is needed.
>>>>>>>> I will advise as more details become relevant, and please forward
>>>>>>>> this message to concerned parties.
>>>>>>>> Regards,
>>>>>>>> Krister Bruhwel
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