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/
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Received on Mon Oct 06 2025 - 07:50:48 MST