[Hallb-engineering] DynaPower Box Supplies

Eugene Pasyuk pasyuk at jlab.org
Wed Jan 12 15:44:26 EST 2011

MiniT will not be used after TPE.


On 01/12/11 15:02, 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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