Hi Bert,
For us it worked perfectly well without the rectifier (until the console
was replaced). However, if the diode is still intact and only the
capacitor is bad, the half-wave rectified pulses from that are probably
not enough any more...
Cheers,
Matthias
On 06/10/2025 19:07, Spin-Doc wrote:
> Hi,
>
> The green box is actually a „poor man‘s“ version of a rectifier (a single diode plus a capacitor). Often times the capacitor dies upon which the relay (no, it won’t work with AC…) can’t engage properly and you cannot switch on the unit. Usually replacing the capacitor fixes it (sometimes contacts can overheat as well, worthwhile checking). 0.5 EUR material cost ;-)
>
> Cheers
> Bert
>
> -> Sent via mobile <-
>
> Spin-Doc
> Magnetic resonance equipment, service, training & more
> Dr. rer. nat. Bert Heise
> Owner, applications scientist
> Kiefernweg 13
> 58239 Schwerte
> Germany
> Web: www.spin-doc.net
> Mail: bert.heise_at_spin-doc.net
> Phone: +49-171-5135315
>
> Representing MestreLab, Stelar & Barthel HF
>
>
>
>> Am 06.10.2025 um 18:27 schrieb joern.droste via groups.io <joern.droste=oci.uni-hannover.de_at_groups.io>:
>>
>> Hello Mathias,
>>
>> Thank you very much for your explanation. It is helpful to better understand the setup of the system to find the causes of the issues we are experiencing.
>> I will have a look into it with an electrician and try to find the malfunctioning part to replace it.
>>
>> Kind regards,
>> Jörn
>>
>> Thanks again for your support and thorough response.
>> -----Ursprüngliche Nachricht-----
>> Von: main_at_ammrl.groups.io <main_at_ammrl.groups.io> Im Auftrag von Matthias Brandl via groups.io
>> Gesendet: Montag, 6. Oktober 2025 16:50
>> An: main_at_ammrl.groups.io
>> Betreff: [extern] Re: [AMMRL] Bruker Avance I Power outage #Bruker #Hardware
>>
>> Hello Jörn,
>>
>> The ESB 63-40 "fuse" is actually a contactor (basically a big relay),
>> and may or may not be broken. We once had a similar problem on our
>> Avance 1 console as well. Some explanation of the system:
>>
>> The contactor closes when you push the "on" button at the front panel of
>> the console, and then goes into self-holding using its terminals
>> numbered 13 and 14. If you push the "off" button, the self-holding
>> circuit is interrupted and the contactor opens.
>>
>> Because it is a 24V contactor, you also need a transformer to provide
>> the control voltage; this can be found to the left of the green box. The
>> green box contains a rectifier to turn the AC output of the transformer
>> into DC. However, this is not really needed because the contactor can be
>> actuated by both AC and DC (although, now that I think about it again,
>> the contents of the green box possibly also served as a snubber circuit
>> for the contactor coil...maybe consult an electrician!).
>>
>> In our case, we deleted the rectifier and replaced the contactor
>> (because we already had it at that point), but it is probably worth a
>> try to test without the rectifier/(snubber?) in the first place to
>> determine what actually needs replacing.
>>
>> Best,
>> Matthias
>>
>>
>>> On 06/10/2025 15:21, joern.droste via groups.io wrote:
>>> Hello Everyone,
>>>
>>> We recently experienced a brief power outage lasting only some seconds
>>> or up to a minute.
>>>
>>> Since then, our Bruker Avance I spectrometer has not been operational.
>>>
>>> Specifically, the cabinet does not receive power when I attempt to
>>> switch it on using the blue button at the cabinet.
>>>
>>> After reviewing past discussions on this mailing list, I've come to
>>> suspect that a fuse might be the cause of the issue.
>>>
>>> I believe the problem could be related to either the green box or the
>>> ESB 63-40 fuse (please see the attached picture for reference).
>>>
>>> Can anyone kindly offer guidance on how I might verify if a fuse is
>>> indeed the problem, and if so, how to repair it?
>>>
>>> Any advice or insights would be greatly appreciated.
>>>
>>> Thank you in advance for your support.
>>>
>>> Kind regards
>>>
>>> Jörn
>>>
>>> Dr. Jörn Droste
>>>
>>> NMR-Abteilung des Instituts für Organische Chemie
>>>
>>> Leibniz Universität Hannover
>>>
>>> Schneiderberg 1B
>>>
>>> 30167 Hannover
>>>
>>> Tel.: +49-(0)511-762-4644
>>>
>>> Tel.: +49-(0)511-762-4647
>>>
>>>
>>
>> --
>> Dr. rer. nat. Matthias Brandl (he/him or they/them)
>>
>> Technical University of Munich
>> TUM School of Natural Sciences - BNMRZ
>> Chair of Biomolecular NMR Spectroscopy (Prof. Sattler)
>>
>> Lichtenbergstr. 4 (postal)
>> Ernst-Otto-Fischer-Str. 2 (physical)
>> 85748 Garching b. Muenchen
>>
>> Phone +49 89 289-52617
>>
>> matthias.brandl_at_tum.de
>> https://www.sattlerlab.de/
>> https://www.bnmrz.org/
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
--
Dr. rer. nat. Matthias Brandl (he/him or they/them)
Technical University of Munich
TUM School of Natural Sciences - BNMRZ
Chair of Biomolecular NMR Spectroscopy (Prof. Sattler)
Lichtenbergstr. 4 (postal)
Ernst-Otto-Fischer-Str. 2 (physical)
85748 Garching b. Muenchen
Phone +49 89 289-52617
matthias.brandl_at_tum.de
https://www.sattlerlab.de/
https://www.bnmrz.org/
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Received on Tue Oct 07 2025 - 04:40:26 MST