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avatar: R123
R123
3 posts
Replied to R123's post on December 12th, 2015

Please can someone help with the likely cause of the Drive LED alway ON on power up?

1. The vacuum pump always stay on as soon as you power up and even the stop button does not put it off until the unit is power off 

2. the slide lid when manually opened by opening the valve and releasiing  the interlock solenoid the vacuum pump comes up.  

3. The CPU LED also comes on intermittently but clears when the stop button is pressed only to come up after a few mins.

4. The VACUUM, START and STOP button do not seem to respond only beeping sound can be heard. 

 

avatar: dpkleessr
dpkleessr
819 posts
Replied to R123's post on December 13th, 2015
Whenever you get a Drive diagnostic, a 45 minute lock out occurs. Turn the power on, wait 45 minutes, hit "ENTER" 411 to see if you get a service code that starts with a "d". If not, pishing the CE button should clear the lock out and enable you to shut down the vacuum pump and open the door. Don
avatar: R123
R123
3 posts
Replied to dpkleessr's post on December 14th, 2015

Don, thanks for the prompt reply.

Just keyed in 411 and got a "d6.1" error code.

Does any one know what it represent and which component might be faulty?

avatar: dpkleessr
dpkleessr
819 posts
Replied to R123's post on December 14th, 2015
I would simply try restarting the centrifuge with a test run. You now know how to deal with the issue if it happens again but if it does occur again then service will probably need to be called. I would try to help more but being off the coast of Mexico on a cruise ship makes it a little difficult. If you can wait until next week I can probably do more. Don Don
avatar: davidkain
davidkain
33 posts
Replied to dpkleessr's post on September 11th, 2016

We have a unit that has started to give a "Drive" error about 10 to 15 minutes into the run. Gets to speed, all seems ok. Then the Drive error and unit stops the run. Checked the error code as mentioned above. It's a d6.6.

Will be grateful for any troubleshooting suggestions.

Thanks

Dave

avatar: dpkleessr
dpkleessr
819 posts
Replied to davidkain's post on September 12th, 2016

A D66 error is drive related as to what the drive voltage is relative to its speed.  What is your vacuum reading because a poor vacuum can cause this issue because of the frictional resistance at speed.  Get back to me when you can.

Don

avatar: davidkain
davidkain
33 posts
Replied to dpkleessr's post on September 12th, 2016

The unit runs fine at 30k and below. Raise it above 30k and you get a drive error.

The vacuum seems ok it is a solid (not flashing)

avatar: davidkain
davidkain
33 posts
Replied to davidkain's post on September 12th, 2016

Seem to have lost part of my reply.

Vacuum display is

avatar: davidkain
davidkain
33 posts
Replied to davidkain's post on September 12th, 2016

Try again from my PC.

Vacuum seems ok. a solid <20 when it fails. It almost always fails 10 minutes into the run.

Apparently this unit has been doing this for a long time and everyone in the lab just never ran it above 30K, because they knew it wouldn't work (go figure).  A tech from another lab borrowed it did a run at 36k and this brought the problem to our attention.

Thanks

avatar: dpkleessr
dpkleessr
819 posts
Replied to R123's post on September 12th, 2016

That is really strange set of failure conditions unlike anything I had ever seen before I retired. Have you checked all of the power supply voltages? The test points can be found on the power supply chassis but be VERY CAREFUL around the electronics chassis as there is literally lethal voltages on those chassis. Do you by any chance have access to a 90Ti rotor? That is the rotor that is used to perform the inertia calibration. If not then it may be time to call for service because there really will be nothing else you can do if you actually want to run rotors faster and longer.

Don

avatar: davidkain
davidkain
33 posts
Replied to dpkleessr's post on September 13th, 2016

Don

Thank you for your reply. I did check the power supplies. 5,+-12 were all right on with about 11 MV ripple. The 24 was 24.5 with about 100 MV ripple. Don't know if that's high or not. There is a large cap on the drive electronic bd. At speed that cap had about 100mv of Ac. Guessing that caps ok.

They do have a 90T rotor. Do you think the inertia cal may help? Would you be able to help with the procedure?

Dave

avatar: dpkleessr
dpkleessr
819 posts
Replied to davidkain's post on September 13th, 2016

Power supply voltages and ripple values all look OK.  One little thing you want to do is to tighten all of the screws on the capacitors that have the Phillips head screws.

Based upon what you're experiencing, performing the inertia part of the calibration can't hurt. I will have to dig out my manual again in order to give you the step by step instructions.  Fortunately, you have an L90K because if you had a centrifuge with a CRT then you could not easily do the calibration. I will get back to you later today after I finish with a few things I need to get done first.

Don

avatar: davidkain
davidkain
33 posts
Replied to dpkleessr's post on September 15th, 2016

Hi Don

Thanks again for your help. Why don’t you hold off on digging up the Inertia Cal Procedure.

I have contacted folks in St Louis who have significant experience with this product. I’m going to work with them. They have the procedure.

I’m kind of suspect that it still may be a straight forward problem. I’m suspicious when the symptom is something experienced folks have never heard of. Plan on going back and taking a close look at the fundamental things that can cause a failure.

I sure appreciate your advice. I recently repaired a DU-640 with information you posted several years ago.

Ill post the solution to this one.

 

Dave

avatar: CERA
CERA
2 posts
Replied to dpkleessr's post on November 14th, 2017

Hi:

 

I get the same issue than you, Can you can solve it?

 

Regards

avatar: dpkleessr
dpkleessr
819 posts
Replied to CERA's post on November 15th, 2017

Considering all that was in theses posts, what exactly is the problem that you are having with your centrifuge?

avatar: CERA
CERA
2 posts
Replied to dpkleessr's post on November 15th, 2017

HI:
I got the same problem that at the begining of the post, same "symptoms" of R123, I´ve cleared all the error codes, but I can't clear code D6.1, I leaved the centrifuge working 1hr but vaccumm is above 20u. do you know if I can do something? or what's related with this code?   Regards