Dear Wendy,
We regularly have these problems while switching probes on the magnets. The
solution for us is to keep a log of the “gain" values in the MAS III
unit for each probe and give these respective gain values manually when we
start with a new probe in the magnet. (quick how to: “ha’ —>
click MAS III web interface —> service mode (ask Bruker) —> spin
detection or similar —> gain value box —> change value)
For instance out 3.2mm e-free probe likes high gain of about 150’s and
the 1.3mm HX probe loves very low values such as 15-30. These gain values only
work on a consistently marked rotor. For instance the gain value will be different
for a laser marked rotor vs a sharpie marked one at the same probe.
All this info is assuming that you have new bearings in the stator and there
is no hardware problem.
Best of luck and kind regards,
Rıza
------------------------
Rıza Dervişoğlu, Ph.D.
NMR Lab. Coordinator at Wiegand Lab.,
Max Planck Institute for Chemical Energy Conversion,
working at ITMC, RWTH, Aachen,
Tel.: +49 (0) 241 80 26429
Address:
SB Chemie
Room: 38B-031
Worringerweg 2
52074 Aachen, Germany
https://mpi-cec.webex.com/meet/riza.dervisoglu
https://www.linkedin.com/in/rizadervisoglu/
ride_at_cec.mpg.de
> On 21Nov, 2023, at 00:30, Wendy Breyer <web216_at_lehigh.edu> wrote:
>
> Hi all,
>
> We have a 400 MHz Avance III HD with a MAS3 unit and a K3166 solids probe
> (full name: MASVTN400S1 BL4 N-P/H) that's been having some real problems while
> trying to spin. A few months ago, when trying to spin, it would stop
> abruptly (or not even start spinning) and give the error: "A critical error
> occurred (Bearing Pressures). Please get the logs and contact customer service".
> (Also our MAS unit would sometimes be so bricked afterwards that I
> had to remove its battery for a few seconds to get it to start communicating
> again.) I sent the probe into Bruker for repair. They removed and cleaned
> the stator assembly, which was found to be dirty and tested the tune and spinning.
> When I got the probe back, it worked flawlessly for one weekend of data collection,
> then started giving the Bearing Pressure error again.
> Eventually, a Bruker service rep had me Tee the line from Bearing gas so
> that it fed back into the "Sense of Bearing" port on the MAS3... which seems
> to have fixed that error.
>
> But we are still having a problem with spin (or spin detection). When I
> try spinning to 5000 Hz, it ramps up to about 1300 and then stops, eventually
> giving the error in the picture below:
>
> I get this error even when I try spinning a newly-purchased, empty rotor
> with a laser score mark. I've tried both without black Sharpie marker and
> with marker (opposite from the laser score mark) - neither works.
>
> It seems like maybe spin detection is not working. Does anybody have any
> suggestions for how to "check the fiber optic at the probe" without ruining
> the alignment of the optic cables? Or how to clean the fiber optic detection
> "window"? Or anything else???
>
> Thanks!
>
> Wendy
>
> Wendy Breyer, Ph.D.
> Director of Instrumentation
> Dept of Chemistry
> Lehigh University
>
>
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Received on Tue Nov 21 2023 - 05:02:08 MST