Irfan's UHU saga

[contactirfu]

Hi All,

Today I put in my third board - and then powered the 15V supply - the LED's sort of just blinked and I think the short protection circuit of the Toshiba 15v power supply kicked in and the 15v supply went down. When I checked the third board I realized that there was a short in the 15V supply.

Now the help I need is that some one had a short on the PCB - an you guys tell me who and where they had the short and did it short the 15v supply?

I am planning to chk all the rest of the PCB's I have from paul for any shorts.

also if you guys know let me know what components would have caused the short - if it is not the PCB..

Thanks in Advance!

Regards

[contactirfu]

Just chkd all the PCB's none of them have the short on the 15V line!

[contactirfu]

defective tantalum! 10uF 35V

[contactirfu]

Hi Folks, I put up the third final board and then everything now is working - but just this one thing - the yellow colored light the one on "clr" is always on now.

I have a habit that I dont bother about things unless they show up!

so now the yellow light has showed up and I dont exactly know what it means .... I mean I have read it several times during the discussions . but may be i am just a lazy a**,

well can anyone explain to me if it is trouble to have the yellow light on?

RGDS
irfan

[H.O]

Hi Irfan,
The LED marked CL is the current limit LED. It will light up when the drive limits the current to the motor. Have you done the mods to the LED circuit as per Kreutz's instructions or is the board as it was originally?

The LED should normaly not be lit, especially not when the motor isn't accellerating hard or moving under very heavy (too heavy) load. What do you have your Vref set to?

/Henrik.

[contactirfu]

yup I did the Mods!

the V ref is set to .079 or .08 I think, .As I see there is no load on the motor, do ya think i should increase the v ref?

what should I moniter when I have set any abnormally high V ref - motor heating?

RGDS
Irfan

here is the router moving 3 axis with the UHU

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[H.O]

Hi Irfan,
Did you cut the PCB trace between R38 and U9? The reason I ask is because I think that might not be a good idea since, as far as I can see, also disconnects the anode of D3 from U9 pin#1. This then takes the slow-limit circuit out of operation. I have PM'd Kreutz about this a while back and he promised to look into it but as you know he's quite busy.

Anyway, are you sure that you soldered the jumper wire to pin#2 on U6 and not pin#1?

Does the drive work otherwise, ie does the motor hold position and respond to step-pulses etc?

/Henrik.

[contactirfu]

Henrik, the drive does hold position and respond wonderfully!

but i have done none of the modifications you have spoken of, the only mod is the IN4148 diode shorting R54 and which then gets connected to ground - it is the same for all the 3 drives.

two work perfectly and this one has its cl led on!

the thing is that it is on even when the motor is stationary and not running the cl led is on, so I will try to connect it to some other motor and try.

hope everything turns out well.

RGDS
Irfan

[H.O]

Hmmm, ok...
Measure the voltage at PIN#1 of U9. If it's 0V or close to it check for solder bridges around the Q5 transistor and/or try replacing Q5. If it's ~5V check R26, R40 and C28 and/or try replacing U9.

/Henrik.

[contactirfu]

Thats a lot in a one liner Henrik, will try your modifications tomorrow.

[kreutz]

Irfan,

Could you, please, fix the link to your latest video, a few posts back? I would like to see it....

Thanks,

Kreutz.

[contactirfu]

http://www.youtube.com/watch?v=XXGDtxylumY

click on the link above, alternatively

the video is live at this this thread

http://www.cnczone.com/forums/showth...=46998&page=11