[Hallb-engineering] DynaPower Box Supplies

Krister Bruhwel bruhwel at jlab.org
Thu Jan 13 11:55:15 EST 2011 

Hello,

I went to the warehouse at Hampton Crane and Rigging and there is a 
power supply that is the same type as the Mini-T (not the same as the 
Moellers) and it has a ZFCT chassis in it.  The supply was under Paul 
Brindza's name and upon calling him I was informed that we can have the 
supply (lots of spares there!) and that he had another ZFCT chassis in 
storage which I have since acquired.  I have emailed DynaPower to see if 
all of these chassis are cross compatible and await their response.  If 
it is so, we have two spares and that would make me very happy for the 
upcoming experiments and gives us time to work on a long term solution.

Regards,
Krister

burkert wrote:
> 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.
> Volker
>
>
> 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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