[AlanD]

I'm interested to read up on the processor used. What is the part number for the Atmel Microprocessor/controller?

[kreutz]

I'm interested to read up on the processor used. What is the part number for the Atmel Microprocessor/controller?

ATTiny2313

[AlanD]

I may be a little distant from most of you - BUT - we may be able to design and supply some heatshinks based upon one of our standard extrusions.

Email me if you are interested:

[email protected]

i have started to order parts for the uhu
all the parts will be available in about 5 days
*** particulars ****

6. no heatsink

[ejkoeze]

one more thing the 7.2k resistors I put in parallel are working fine but still get pretty HOT...probably will use some sort of heat sinking.......

Done a little snooping on the German board. Something i came across that is easy to fix is a ferrite bead in the motor leads. The heating of these resistors may be cause by HF noise in the motor leads.
If it works it's an easy fix.

Erik Jan

[contactirfu]

Done a little snooping on the German board. Something i came across that is easy to fix is a ferrite bead in the motor leads. The heating of these resistors may be cause by HF noise in the motor leads.
If it works it's an easy fix.

Erik Jan

Eric,

those Ferrites, do they need to be at the start of the motor coils or at the ends and more over what are the approximate size of the ferrite that might be used?

Any more details.......can u post the link of the page on teh german forum where it is discussed.

Thnaks a LOT for the Info

CYA

[kreutz]

Done a little snooping on the German board. Something i came across that is easy to fix is a ferrite bead in the motor leads. The heating of these resistors may be cause by HF noise in the motor leads.
If it works it's an easy fix.

Erik Jan

Ferrite beads are made to filter RF interference in the range of 30 Mhz and Up, It is a good solution for EMI but not for avoiding Snubber resistor heating. The snubber resistor is supposed to dissipate energy and heat-up. While the design seems very good, I don't think they did a good job on the design of the RC snubber circuit. 1.8K seems too high for the snubber to work as it is supposed to.

I don't own one of those boards, It would be necessary to have switching transients oscillograms in order to re-design the snubbers. What is important is that the snubber components have to be the proper ones, not only the right value.

[kreutz]

I may be a little distant from most of you - BUT - we may be able to design and supply some heatshinks based upon one of our standard extrusions.

Email me if you are interested:

[email protected]

AlanD;

Very good your offer, but the shipping charges might make them too expensive for us in the USA (in small quantities), unless someone is willing to order high quantities and have them in stock here..

Thank you.

[contactirfu]

Ferrite beads are made to filter RF interference in the range of 30 Mhz and Up, It is a good solution for EMI but not for avoiding Snubber resistor heating. The snubber resistor is supposed to dissipate energy and heat-up. While the design seems very good, I don't think they did a good job on the design of the RC snubber circuit. 1.8K seems too high for the snubber to work as it is supposed to.

I don't own one of those boards, It would be necessary to have switching transients oscillograms in order to re-design the snubbers. What is important is that the snubber components have to be the proper ones, not only the right value.

Kreutz

Redesign the snubbers ........ hmmmm that sort of tough job.......any volunteers for it, can any one trace out where to buy those ohmite pulse eaters resistors, i tries mouser could not find high wattage ones so what say any one can find those, just update me , i can ask paul to get it for me...

thanks and Regards
Irfan

[kreutz]

Kreutz

Redesign the snubbers ........ hmmmm that sort of tough job.......any volunteers for it, can any one trace out where to buy those ohmite pulse eaters resistors, i tries mouser could not find high wattage ones so what say any one can find those, just update me , i can ask paul to get it for me...

thanks and Regards
Irfan

If we can find somebody who has one of those boards living in South Florida (USA) I can do some measurements and re-design them.

[contactirfu]

If we can find somebody who has one of those boards living in South Florida (USA) I can do some measurements and re-design them.

Ho Kreutz has volunteered.......and now any one in the USA would it be possible to lend out your controller boards (working) to Kreutz,,,,,,I my self am in India and dont think i can post you my controllers.....

Any volunteers...........

Regards
Irfan

[smarbaga]

hello kreutz.
thanks for your offer.
i could lend you a controller board but it would not be for a few weeks as i am out of 2313 controller chips.
i have just e_mailed Mr. Huber and am awaiting a reply.
btw - if there are some of these chips ( programmed 2313's) lying around in the usa i would gladly take them off of somebody's hands .
i have 6 bare boards left ( no cpu's ) i think i am going to build these up as i have all the rest of the parts.

[kreutz]

hello kreutz.
thanks for your offer.
i could lend you a controller board but it would not be for a few weeks as i am out of 2313 controller chips.
i have just e_mailed Mr. Huber and am awaiting a reply.
btw - if there are some of these chips ( programmed 2313's) lying around in the usa i would gladly take them off of somebody's hands .
i have 6 bare boards left ( no cpu's ) i think i am going to build these up as i have all the rest of the parts.

Thank you, Smarbaga, PM me when you are ready. For the tests I will repair a servo motor I have somewhere else, it is missing the encoder.

[contactirfu]

Thank you, Smarbaga, PM me when you are ready. For the tests I will repair a servo motor I have somewhere else, it is missing the encoder.

Kreutz I have one spare 250cpr US Digital encoder which can take up a 6mm dia shaft i can lend u that, but it usally takes a month or so for the post to reach U........ will it be ok........

Irfan

[kreutz]

Kreutz I have one spare 250cpr US Digital encoder which can take up a 6mm dia shaft i can lend u that, but it usally takes a month or so for the post to reach U........ will it be ok........

Irfan

Thank you,

I have the new encoder already. I haven't had the time to do it, and I really don't use the servo, so it has been neglected.

[L98FIERO]

In post #836 I posted some info and pictures of a problem I had and am trying to determine the cause(I've added some pictures).

I don't know if it happened but could it be caused by connecting the 120 VDC backwards? Would it be obvious if it was done?

Other than the 15 amp fuses in the lines between the transformer and the bridge rectifier is there something else I should be using for current limiting? This is the original power supply from the 20 year old Anilam control and the fuses it came with, should there be one fast and one slow blow fuse in the ~90 vac lines?

What else can I check before I try another board so it isn't damaged as well? The motor I was using for testing will work on the one drive board so I'm reasonably sure it's not the motor but I'm definitely open to suggestions.

LaVerne

[kreutz]

In post #836 I posted some info and pictures of a problem I had and am trying to determine the cause(I've added some pictures).

I don't know if it happened but could it be caused by connecting the 120 VDC backwards? Would it be obvious if it was done?

Other than the 15 amp fuses in the lines between the transformer and the bridge rectifier is there something else I should be using for current limiting? This is the original power supply from the 20 year old Anilam control and the fuses it came with, should there be one fast and one slow blow fuse in the ~90 vac lines?

What else can I check before I try another board so it isn't damaged as well? The motor I was using for testing will work on the one drive board so I'm reasonably sure it's not the motor but I'm definitely open to suggestions.

LaVerne

Connecting the 120 VDC supply backward could destroy the mosfets, that is a possibility. In that case also the sense resistors should have overheated and smoked. Unless the fuses (by blowing) did not give enough time for that.

The fuses should be Slow Blow (both).

[smoker]

Hi, I have been reading through the uhu manual, but could not find a solution for the problem stated in this post:
http://cnczone.com/forums/showthread.php?t=10246

The geckos seem to have some kind of solution for this as Mariss stated in the thread, so I was wondering if there is something similar?
Or maybe this does not apply in the UHU solution?

David

[ulihuber]

David,

as long as your motor is a usable one for servo application and your encoder is in the 'normal' range from 100 to 1000 cpi, you should not encounter stability problems with the UHU. Proper parameterizing assumed.

There are many machines in all power classes and all without any noise in their position.

There is one thing the UHU3.0 cannot deal with: Backlash in between the motor and the encoder wheel. If your setup is like that (gear and encoder on the spindle, or spindle with backlash and linear encoder) you'll not find a good and stable setup with acceptable speed.

Another bad combination is a very coarse cummutator of the motor and a high resolution encoder. If the motor is mechanically unable to reach the set point, no servo controller can handle it.

Best regards
Uli

[vacpress]

Hi!

I did some google searches, and did not find anywhere to order PCBs for the UHU controller, nor did i find artwork for a PCB...

Has anyone got any advice where to look? Even the wiki seems to lack this, or if it is there, it is hidden inside a zip or pdf or something

Also, any US builders find good local equivelants for the parts?

I hate to be irritating, but i just read 20 pages of the thread and didnt see much in terms of a) component costs with local parts b)if local parts are available, c)if PCBs are still available. i did see a reference to smarmbega's pcb, or similar name...

Thank you!

[GAWnCA]

Hi!

I did some google searches, and did not find anywhere to order PCBs for the UHU controller, nor did i find artwork for a PCB...

Has anyone got any advice where to look? Even the wiki seems to lack this, or if it is there, it is hidden inside a zip or pdf or something

Also, any US builders find good local equivelants for the parts?

I hate to be irritating, but i just read 20 pages of the thread and didnt see much in terms of a) component costs with local parts b)if local parts are available, c)if PCBs are still available. i did see a reference to smarmbega's pcb, or similar name...

Thank you!

Why so much concern over the UHU Controller. Why not just get the Gecko Drive and be done with it. http://www.geckodrive.com/product.cfm?pid=13

By the time you etch the board and buy the parts, they will cost you almost as much if not more that buying something that is proven. I've been there and done that and it's nice to say I built that but, breaking down the cost and time, they cost you a lot more and then no support except your own.