[RASMB] XL-A "waiting for speed" forever

Thu Feb 13 17:56:42 PST 2020

This could be true, however normally the Optimal XL would throw a D62 
with a bad tach module.
Sometimes rolling the NVRAM on the ICB will help diagnose this issue. If 
you would like further info on this please contact me.
John Gunther

On 2/12/2020 5:01 PM, Cole, Richard A wrote:
>
> Or you can change the tach module
>
> *From:* RASMB <rasmb-bounces at list.rasmb.org> *On Behalf Of *John Gunther
> *Sent:* Wednesday, February 12, 2020 9:26 AM
> *To:* asnascimento at ifsc.usp.br; rasmb at list.rasmb.org
> *Subject:* Re: [RASMB] XL-A "waiting for speed" forever
>
> Hi Alessandro,
>
> It sounds like the ultracentrifuge has hung. When this happens one 
> could shut down everything. Recycle the power and start over.
> When you do this use the stop button on the 'fuge. When the rotor 
> comes to a rest wait 30 minutes to allow the diffusion pump to cool*.
> You do not have to vent the chamber for a short power cycle on the 
> fuge. Turn off the fuge, (after the 30 minute cooling period), for 
> about 10 seconds.
> Then turn it back on. It should not vent the chamber. It will restart 
> the vacuum pump and continue to pull down the chamber.
>
> Cycle the power on the PC and launch you AUC app. (cold start the PC 
> by shutting down and turning the power off)
>
> If the fuge won't respond to the stop button one could cycle the fuge 
> power while it's running at 3k as a last resort. This IS NOT 
> recommended with a hot diff pump.
>
> The bottom line is the fuge has NVRAM (non-vol-ital ram) on the 
> instrument control board, and the CRT control board. These "chips" 
> have a battery on board the chip to hold memory when the power is off. 
> This battery is a Lithium battery with a life span of 10 years or less 
> (sometimes more). If your machine is more than 10 years old, and these 
> chips have not been replace, it is likely your chips are getting bad 
> (the internal batteries are dying). You can buy these chips from 
> Beckman Coulter however they are expensive from them. They can be 
> purchased from electronic part suppliers for around $30 each US.
> If you have a qualified electronic person they could replace them. 
> These chips are in sockets and are intended to be replace.
> There is a clock chip on the CRT control board that needs to be 
> replace for the same reason, a dead battery. This resolves itself as 
> the date on the fuge appearing as ??/??/??. The time is also incorrect 
> on the fuge. (not the PC) The clock chip can be more complicated as 
> sometimes it is not in a socket.
>
> If you are interested in doing this, I can help you. If you don't feel 
> comfortable doing this, call your Beckman Coulter service rep.
>
> Overspeed disks are expensive and would likely not do anything for 
> this problem.
>
> John Gunther
> Rocky Mtn SIMS, LLC
>
> * allowing the diff pump to cool will reduce the possibility of free 
> vaporous diff pump oil condensing on the optical components.
>
> On 2/11/2020 7:24 AM, Marius Schmid wrote:
>
>     Dear Alessandro,
>
>     If I remember correctly, I might have seen an error like this in
>     the past. But I am not entirely sure if it was caused by the
>     overspeed disc of the rotor or an malfunction of one of the
>     control boards. Did you try to exchange the overspeed disc of the
>     rotor? There might be a problem with the magnets on the overspeed
>     disc and the hall sensor.
>
>     best wishes,
>
>     Marius
>
>     Am Dienstag, 11. Februar 2020, 14:40:59 MEZ hat Alessandro S.
>     Nascimento <asnascimento at ifsc.usp.br>
>     <mailto:asnascimento at ifsc.usp.br> Folgendes geschrieben:
>
>     Dear RASMB members,
>
>     we are having a problem with our XL-A. I've searched in the list
>     and the possible solutions I could find did not solve the problem.
>
>     Once the experiment is set up, with stabilized temperature and
>     vacuum (0 micron) running at 3000 rpm the instrument status keeps
>     as "waiting for speed" while the instrument is already stabilized
>     @ 3000 rpm.
>
>     We tried to rapidly remove the white jumper and plug it again and
>     also tried to setup a non-zero velocity with the door open
>     (forcing a drive diagnostic). Those suggestions appeared in the
>     list in the past. None of these could restore the sync between the
>     instrument and the software.
>
>     Any clues on what could be going on?
>
>     I thank in advance,
>
>     -Alessandro
>
>
>     -- 
>
>     ********************************************************
>
>     Alessandro S. Nascimento
>
>     Professor
>
>     São Carlos Institute of Physics (IFSC)
>
>     University of São Paulo (USP) - Brazil
>
>     E-mail: asnascimento at ifsc.usp.br <mailto:asnascimento at ifsc.usp.br>
>
>     Phone: +55-16-3373-8709
>
>     ********************************************************
>
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