Need Help!- Mitsubishi Meldas M50 error code S01-0020

[bocko912]

Tryed to boot up my Yang Eagle 600 with Meldas M50 this morning and I got an error code S01-0020. I did a search in this forum for this problem and it seams it is encoder related.After the error code I get XYZ. This means that all 3 axis have encoder problem? What are the odds of that. Could it be that I have lost voltage signal to all encoders?

[onthebumper]

Take a look at your drives in the electrical cabinet. They should be flashing an alarm, probably 20. Check on Mitsubishi's website www.meau.com. They should have some troubleshooting procedures for that alarm. I doubt that all three drives have the same problem like an encoder going bad on all three at the same time. Very odd.

[Rokkin]

Make sure SV25 (MTYP) is set correctly for the encoder type you have.
On the M50 I think it's actually parameter #3205?? I've never seen 3 encoders go bad at one time. It has to be something common to all 3 axes.

[bocko912]

Guys
I will check # on the drives tomorrow. I tried switching the drives but nothing happens. It will not energize any of the drives. It just gives me the S01-0020 alarm and just sits there. So what ever happened it is on all 3 drives because none of them will energize.

[onthebumper]

When one of your drives alarms out, none of the drives will energize. The CNC will not send a ready command unless there are no major alarms in the system.
Swapping drives will not show you much until you know what alarms you have on each drive and then see if the alarm follows the drive. In your case since all three drives are alarming out the same this won't help much.

[Leelund]

Found this on Meau. Pertain to MDS type drive but rule of thumb is same. In the case of digital drives, usually 56 eStop is on the good drives and the alarm # say 20 will be displayed on the bad drive or axis. HTH.

[bocko912]

Guys
I did download that alarm PDF. I did get a chance to write down what is flashing on the drives.

NC Controller flashes X axis Flashes Y axis Flashes Z Axis Flashes
A.L. F1 F2 F3
S1 20 20 20
20
01

Alarm Diagnostic

S01 servo alarm PR 0020 X

EMG SRV

This is what my screen and drives say. I can take pics of the actual screens and attach if that would help anyone.

Thanks John

[bocko912]

Guys
I have attached some pics of the screen and the drivers. I did make a mistake though on the screen it is only displaying X axis NOT XYZ as I stated but, the drivers all flash 20.

NC controller Flashes A.L. , S1 , 20 , 01

X Axis Flashes F1 , 20

Y Axis Flashes F2 , 20

Z Axis Flashes F3 , 20

[onthebumper]

Does this happen on power up?
What were the events that lead up to this? Did the machine crash before hand?
This is a very difficult problem to troubleshoot because all three drives show the same thing.
It was stated before but have you checked all of your servo parameters to the hard copy for your machine? Have you had battery alarms? Have you lost any data such as programs or tool data. This would indicate some loos of parameters as well.
You may want to give Mitsubishi a call (847-478-2500) at talk with one of their service engineers. If nothing else they will recommend a part like an encoder to try out. If they recommend it and it doesn't work you can return the part for full credit.

[CHANDRU]

DEAR BOCKO 912,

PLEASE CHECK THE 24V POWER SUPPLY BECAUSE FROM THE PHOTOS WHAT YOU HAVE GIVEN YOU ARE GETTING ALARM MESSAGE Z-AXIS BRAKE OFF.WHEN YOU SWITCH ON THE MACHINE THE Z-AXIS BRAKE SHOULD BE IN ON POSITION AND IF IT FAILS THE SERVO AMPLIFIERS FOR THE AXES WILL NOT GET ON CONDITION FOR SAFETY REASONS.

SO PL CHECK THE 24V POWER SUPPLY,

MAY BE OTHER MAZAK/MITSUBISHI EXPERTS CAN CORRECT ME IF IAM WRONG.

THANKS,

CHANDRU

[bocko912]

Guys
Before I shut the machine down for the day I moved all the axis's around to reach the lube points to lube the machine. As I was moving the Z axis down I noticed that it was making a vibrating noise and axis was jerking. Machine was running fine until this point. I was in a hurry so I just shut down the machine and figured I would deal with it in the morning. When I came in the next day I have the alarms that you see on mt posts. I was planning on call Mitsu. today and I will also check the 24 volt Power supply as suggested. There were no alarms prior to shutting down the machine.

Thanks John

[Rokkin]

Have you paged through your parameters to see if they're all there and or look abnormal? Do you have a hardcopy in the back of the machine that you can compare them to?
A 24V loss should yield a 24V down alarm.

I may be able to locate parameters for this machine if needed. I'd have to check.