Date: Tue, 21 Nov 2023 13:15:45 +0000
Dear Wendy,
please check the configuration to see if the threshold setting can be reduced.
I needed to know which firmware you are using.
In the Web page you find the configuration setting and inside configuration,
you'll find under "Miscellaneous" the Threshold setting. You can adjust that
value to a lower threshold.
Regards,
Jocem
-Bruker Confidential-
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Madhu Basetti via groups.io
> Sent: Tuesday, November 21, 2023 4:40 AM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] 4mm MAS3 Spinning Issues #Bruker #solids #Troubleshooting
Hi Wendy,
As long as spin reading is present there is no need to check fibre optic
at the probe.
Since you have already seen spin up to 1300 Hz but not reaching desired 5000 Hz,
this might be due to the rotor is empty. Try with a filled rotor rather than empty one.
We have seen this kind of problem with a light weight samples of cancer biopsies.
Some times simply changing the cap of the rotor is the solution in our experience.
Hope it helps,
Best wishes,
Madhu
-----------------------------------------
Dr Madhu Basetti
phone:++44(0)1223 769645/769557
Fax: ++44(0)1223 769510
e-mail: Madhu.Basetti_at_cruk.cam.ac.uk
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Wendy Breyer
> Sent: Monday, November 20, 2023 11:31 PM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] 4mm MAS3 Spinning Issues #Bruker #solids #Troubleshooting
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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