[Andrey67]

Hi!
The motor on axis Z works less, than on other axes. I will change Vref as small as possible. I have digital thermometer DS18B20 on IRFP264, now there is a possibility temperature to supervise. The reduction ratio is 5:1 on axis Z.
Thanks!
Andrey.

[Andrey67]

Long time UHU HP worked perfectly!!! But today there was a malfunction. In an operating time the axis "Y" has stopped. Has lighted up LED "Error". As pendant I use ShuttlePro2. If I twist a wheel on pendant, motor "Y" turns non-uniformly will stop, then again turns. How to me to find breakage?
Can make to me Reset the chip? But I do not know, how it to make.

[contactirfu]

may be your mosfets have given up ???

[Andrey67]

may be your mosfets have given up ???

Can be. But any time (20-30 minutes) an axis "Y" works correctly (but if at this time to use pendant non-uniform rotation of the engine is observed), and then again Error. I constantly supervise temperature mosfets. The temperature did not rise above 38 degrees. How to me to check up mosfets?
Has restarting Windows and start a cycle again 3 times. Errors were not. I will observe further.

[H.O]

Perhaps the pendant is commanding a step-rate that the motor/drive can't keep up with so the drive faults on following error. Take the pendant out of the equation for now, there might be something wrong with it or the software used to interface it.

Next thing is to swap the X and Y drives and see if the faults "follows" the drive. If it does, you know that you have a problem with the drive. If the fault stays on the Y-axis (which is now using the X-axis drive) the problem might be with the motor and/or encoder and wiring.

/Henrik.

[LZ1TWB]

Hello,

Nice machine and compact drive enclosure but I have some concerns I may share. Firstly this is a very low induction motor which I think is not suitable for the UHU. You should not have disassembled it, this lowers the magnets strength just as in steppers. The wire, that is seen is used to charge them with a current pulse when the motor is already assembled. You cannot rely on the N/m specs that the label claims now.

Compact design on the drive system is nice but putting the servos in the computer case will lead to nothing but problems. Not because that the computer is rather noisy and can trigger errors in the UHU but the drive itself is a very powerful source of noise also. I myself have had problems with a keyboard going crazy when operating. It is just not good that it changed screens in windows while still jogging the motor. Thank god I got the soft limits turned on that time. From my opinion these things should always be separated, filtered and well shielded.

Anyway thanks for sharing your valuable experience with us, I am happy when someone makes a real machine working with the UHU. There are as many as 3000 items sold as I know and so few details on things done with them.

Thanks,

Todor

[Andrey67]

Thanks all for answers!
I think, that my error was that I have established too big loading (Units/Min)on the motor. Therefore it also has stopped, and- "Error". When I have reduced loading by the motor, I have made three details and "errors" was not.
Thanks,
Andrey.

[H.O]

Congrats! sounds a bit strange that it worked for months and suddenly decided not to, anyway I'm glad it's back to working!

Nice machining! Any photos of the setup, in the machine?

[Andrey67]

Excuse me for my English!
But I have not understood a phrase "Any photos of the setup, in the machine?".

[H.O]

I mean a photo of when you actually machined the part, where you can see how you had the part clamped to the machine etc etc.

[Andrey67]

In the near future I will make still details. Then also photos will be.

[Andrey67]

Manufacturing of a detail by UHU HP servo controllers.


[ame="http://www.youtube.com/watch?v=qSv20p76Yk4"]YouTube- UHU HP in work[/ame]

[jalessi]

[ame="http://www.youtube.com/watch?v=qSv20p76Yk4&feature=player_embedded"]YouTube- UHU HP in work[/ame]

Very Nice Work!

[Andrey67]

I have made some identical details. Today I have spoilt a detail. During any moment all trajectory of processing has moved to the right on axis Y on 2mm. I have made one more detail. Errors are not present. But when did one more detail error has repeated.But already in other place of a detail.
In what a cause of error?

[H.O]

Hi,
Can be due to a lot of things.... Slipping drive pulley, drivebelt "cogging over", encoder not properly mounted on motor shaft, flakey break-out-board or cabling, software "glitch", electrical noise etc etc.

Did you happen to check the O-count on the UHU after you lost position? If it says anything other then zero it indicates you have a problem with the encoder signals. Check cables, shields and ground connections etc.

/Henrik.

[Andrey67]

Hi,
Thanks for the answer! I am glad that you have understood my English!
I have checked up all wires, connections, etc. All was in norm. I have Digital Readout.Sometimes I observed different indications DRO Mach3 and Digital Readout.
Today I have reinstalled Windows2000 and Mach3. Has made a detail. Errors are not present. But I am not assured, that the error can not repeat.
I did not load a file ( .nc) on a hard disk. I left a file on Flash-Memory. The reason can was in it?
While I will not know the reason, I will constantly compare indications DRO Mach3 and Digital Readout.

/Andrey

[H.O]

Hi,
I've had problems with running files directly from USB-memory. In my case that damn autodetect/autostart appliaction kept starting while the file was running. Not saying this is the case here but I definitely recomend copying the file to the local harddrive before loading it into Mach3.

/Henrik.

[Andrey67]

Hi,
I have used the UHU HP 6 years without problems!
But yesterday I had an Error for the axis Z. If I take off the timing belt, the motor turns without problems. A small load leads to an error after a while (even when I omit the table down).
How to start troubleshooting?
Is it possible that the Vref for Z has been changed?

Thanks!
Andrey

[Andrey67]

Is it possible that the Vref for Z has been changed?

The Vref decreased to 70mV (it was 200mV) for axis Z.
But why did it happen spontaneously?
Maybe the reason necessary to look deeper?

Andrey

[kreutz]

Please, re-solder all the components in the Vref circuit, check also the potentiometer and other resistors in the circuit using an ohmmeter. You can also compare voltage measurement with the other controllers that are working ok in order to find the defective component.

Best regards,

kreutz