[Hallb-engineering] DynaPower Box Supplies

Eugene Pasyuk pasyuk at jlab.org
Wed Jan 12 14:54:18 EST 2011

HDIce run will need Moeller.


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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