DIY Servo controller

[rokag3]

are you sure of the polatity ?

[kreutz]

hello ,
i have just started to test my first UHU HP board, the serial comms are fine i think !!
am able to soft reset ,and input data,
however the tantalum capacitors c19 and c23 have both blown, there is +14.9v
at both locations.

no motor power or motor is connected.

can you help please.
regards mick.

Both need to be 10uF/25V, or 10uF/35V, tantalum, observe the polarity too. 16V capacitors will blow.

Kreutz.

[mick22]

rokag3,kreutz,
polarity was correct,
must try 36v now.
thanks for reply, mick.

[kreutz]

.....I abandoned the floating point PID, for a Q15 fixed point......
Kreutz.

There will be a few changes associated with the Q15 implementation of the PID algorithm: It will require the offline calculation of scaling factors and Q15 PID coefficients and other parameters.

So the simple, hyper-terminal type, programming interface will have to be replaced by a dedicated PC program for setup and tuning. That will require to write that program in Visual Basic or C++, and will require more development time.

[kreutz]

The 20 pin wire-wrap socket will be inserted on the current UHU chip socket. Power and other connections to HP UHU board will be done through the original UHU chip socket. Maximum encoder frequency will be 3.3Mhz. Step frequency will be > 100 Khz.

The 10 pins IDC lateral connector is only for test signals and won't be present on the final board.

Kreutz.

[jcdammeyer]

The 20 pin wire-wrap socket will be inserted on the current UHU chip socket. Power and other connections to HP UHU board will be done through the original UHU chip socket. Maximum encoder frequency will be 3.3Mhz. Step frequency will be > 100 Khz.

The 10 pins IDC lateral connector is only for test signals and won't be present on the final board.

Kreutz.

Looking good so far!!!!

John

[kreutz]

Here is a photo of the dsPIC33 prototype board mounted on my first HP UHU (prototype) board (Rev00E).

[kreutz]

.....took a look at Microchip's DSP library PID function, and decided that it is a complete lost of time, it was made for (benchmarking) marketing purposes, and will never work on a serious circuit because of the lack of integral saturation. Too simplistic. .....

Kreutz.

There is a workaround to the missing integral saturation on the DSP library.....

Kreutz.

[grabik]

Thanks, I will send it when ready...

Kreutz.

Hi,
That my first post on cnczone and sorry about my English.

I am use some very simple code for PID in C which i am found in one book.
That PID code working not to bad ,just to quick for thermostat and need bit a slow down.
I am before test microchip PID C code in MPLAB simulation and find that PID code is very quick on DSPIC, I am don't know if that will work in real but in MPLAB simulator worked in kHz.

And just won say that 48% of memory not mean that DSPIC every time run for all of that code, most of code is print function and code for serial port and so on, DSPIC in normal work most of time reading QE , command pulse from PC and working on PID calculation.

[kreutz]

Hi,
That my first post on cnczone and sorry about my English.

I am use some very simple code for PID in C which i am found in one book.
That PID code working not to bad ,just to quick for thermostat and need bit a slow down.
I am before test microchip PID C code in MPLAB simulation and find that PID code is very quick on DSPIC, I am don't know if that will work in real but in MPLAB simulator worked in kHz.

And just won say that 48% of memory not mean that DSPIC every time run for all of that code, most of code is print function and code for serial port and so on, DSPIC in normal work most of time reading QE , command pulse from PC and working on PID calculation.

PID for temperature control is slow. My DIY infrared PID controlled reflow oven's period is a couple of seconds, and it works like a charm, perfect reflow profiles. Most of the code is generally dedicated to the user interface.

Kreutz

[kreutz]

The prototype board is already finished. Ready to do some tests of the code.

This prototype will not work directly connected to the HP UHU board yet, since there are inputs and outputs which will have to be conditioned in order to make the 3.3 V DSC work with 5 Volt logic. I did not include the voltage translators on the protoboard because they are manufactured with SMD footprints only.

Translators are required because some people use 74HC14 and other people use plain TTL 7414 chips on the HP UHU, adding an input passive conditioning circuit would require the users to do some modifications.

The LED driver outputs will need buffering/translation because this dsPIC33 can only drive 4 mA on most of the I/O pins, that is why I included 3 LEDs on the prototype board, driven by 3.3 Volts. The final "Stamp" daughter-board will keep the 1 3/4" x 2 3/4" or smaller size footprint, and will be SMD, except maybe for the dsPIC33 chip.

Kreutz.

[lamestllama]

Hi kreutz

Is there any chance these daughter boards could be used with the original UHU boards ?

It seems that since both use the UHU chip that only physical layout would be an issue.

Eric

[kreutz]

Hi kreutz

Is there any chance these daughter boards could be used with the original UHU boards ?

It seems that since both use the UHU chip that only physical layout would be an issue.

Eric

You are right, it all depends on physical layout. I will try to make them as small as possible...

Kreutz.

[jcdammeyer]

Hi,

Does anyone know how far to space apart conductors that are carrying 240VAC (low current for LEDs) on a board without insulating solder mask?

Thanks
John

[kreutz]

Hi,

Does anyone know how far to space apart conductors that are carrying 240VAC (low current for LEDs) on a board without insulating solder mask?

Thanks
John

General guidelines. Read: http://www.tmworld.com/article/CA6545584.html, http://www.gkcl.com/eglobal2007/eLea...ndExamples.htm , and this one: http://archive.evaluationengineering...03prodsafe.htm

[phat86]

Hello every body .

I am Phat in Vietnam .

In board of uhu controller have 2 IC that I can't to findout in Vietnam . Those are : HCPL 2631 and IR 2184 .

Any body can help me buy 2 those IC or send me address for me to buy them .

Thank you very much

Phat .

[tenmetalman]

Prat,
Go to gmail & send a email to "uhu.highpower". write a request with your address & I'll give you a quote including shipping................If your short on anything else include it the shipping will be the same for a few small items. Please be clear on the number of each item you need.
Paul a.k.a.tenmetalman

[phat86]

Dear Mr.Paul a.k.a.tenmetalman
I want to send you to e-mail address "uhu.highpower" . But Gmail announce me that wrong address , Please take a look to help me send .

Best Regards

Phat

[vroemm]

I ended up updating the "official" parts list by FromDusk
.
.
PLEASE post corrections, additions, or alternate parts, I will try to keep the sheet up to date for a month or so if people are interested, then a more stable version can be added to the wiki if others find this useful.

Hi John.

Nice work on the parts list !

I was also busy trying to improve the parts list.
See the spreadsheet below this message.

I made the changed items yellow in the spreadsheet.
And i put "USER CHOICE" - "END USER CHOICE" areas in the list.
The order codes of reichelt.de are clickable links to the part.

Here are some points about your parts list.
At the bottom a question about which parts to put in the partslist.

A: Change original author to Stefan8051.
Stefan8051 is the original author of the parts list.

He designed the UHU printed circuit board,
The first parts list was in his UHU PCB package.
Which he presented in this message:
http://5128.rapidforum.com/topic=125...32303922101823

Then i started adding the reichelt.de order codes to it.
With lots of help of the experts on peters cnc ecke.
http://5128.rapidforum.com/topic=125...32303922110697

Then fromdusk improved the parts list a lot.
http://5128.rapidforum.com/topic=125...32303922782180

Fromdusk does not use fromdusk@gmx.net anymore.
He gave this email address instead: Stueckliste@jubii.de
But i have not been able to reach him on it.
Last time i heard from him is about 3 months ago.

I think we can improve the parts list, and then put it in the UHU Wiki.


B:

Uli strongly advices to connect the encoder via a differential line driver to the UHU.
This substantialy reduces error by EM interferance.

This could be added to the parts list:

1 Differential line reciever AM 26LS32 CN 0.300 €
1 DIL 16 Socket GS 16P 0.180 €
2 330R METALL 330 0.082 €
1 100n X7R-5 100N 0.120 €

If you need a sender for your encoder
1 Differential line sender AM 26LS31 CN 0.300 €
1 DIL 16 Socket GS 16P 0.180 €
1 100n X7R-5 100N 0.120 €


C:

TL082 is a bit overloaded, wich can lead to a defect TL082.
R13 was METALL 1,20K
R13 becomes METALL 2,20K
Then the TL082 is no longer overloaded.

D:

In your parts list:
list number 1, 0.1R, should be 5 resistors instead of 3.
See current parts list.

E:
QUESTION:

This is a problem, maybe more experienced people can answer this:

Original :

R10= 1,8K 2Watt,
C3= 100nF

R10 becomes to hot at voltage above 50 volt.

Uli suggests:
R10= 4K7 3Watt
C3= 47nF MKP-10-630 47N

But reichelt.de does not have 3Watt resistors.
Could two 2W METALL 10K in parallel be used
Then it would be R10= 5K 4 watt.

Upto what voltage should the original R10=1,8k 2 watt be used.
And from what voltage should the R10= 5k be used ?


F:

Would it be better to use everywhere X7R-5 capacitors instead of MKS-2 capacitors ?

G:
Uli suggests to use these plugable connectors.

male 1 connecting terminal 10-pole K5 + K6 + K7 + K9 RM 3,5mm AKL 182-10 0.890 €

female 1 connecting plug 10-pole RM 3,5mm AKL 169-10 1.700 €

male 2 connecting terminal 4-pole K1 + K14 + K3 + K15 RM 5,08mm AKL 320-04 0.350

female 2 connecting plug 4-pole RM 5,08mm AKL 314-04 0.980 €

male 1 connecting terminal 2-pole K8 RM 5,08mm AKL 320-02 0.170 €

female 1 connecting plug 2-pole RM 5,08mm AKL 314-02 0.490 €



Vroemm

[vroemm]

Hi.

I made a poll to find out how many of you would like to have a sub-forum for the UHU servo controller.
Where we can make many threads on many subjects.
http://www.cnczone.com/forums/showthread.php?t=60187


Vroemm