[Hallb-engineering] DynaPower Box Supplies

[Krister Bruhwel]

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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