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IP2 placing parts shifted after servo fixed?

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IP2 placing parts shifted after servo fixed? | 1 May, 2009

Hi all,

We had a servo amp replaced (SA-6) and the machine worked with no problem for the first panel (this panel of 10 only needs a TQFP100 from the MTU). Then I got the "Servo NG" error again. One of the servo paks showed a "7" on the LED. The error went away after resetting it (a few times) and I noticed that the most outer conveyor (behind the MTU) wasn't working. I didn't think much about it and I run another board. The IP2 placed the TQFP100 slightly shifted down and right this time. We did a Fuji flush, transmitted status and proper but it still placing the TQFP100 shifted. I checked the power to the outer conveyor and it looks ok (40VAC) and the relay clicks on/off when I put my hand under the sensor as if it were a board. I'm assuming the motor is damaged which is no big deal. The real problem is we don't know what is causing the shift in the placement. We tried another program known to be good (different job) and we got the same shift on the single part placed for that job (an smd deep sw from a feeder).

Does anyone know what could be causing the shift? and how to fix it?

Thanks a bunch.

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IP2 placing parts shifted after servo fixed? | 1 May, 2009

I don't have the manuals with me, so, Which axis is SA-6? Which amp displayed "7" What is "7"? 40 volt? measure across the motor power, not to grd. I think it should be 100vac

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IP2 placing parts shifted after servo fixed? | 1 May, 2009

Swapping a servo amp out does not lead to an alignment issue unless the new amp is way out of adjustment. Did you do a "drift" adjustment after changing the amp? Does the axis vibrate badly while moving?

More likely is someone crashed a head which possibly knocked the alignment out or even bent the Z axis shaft.

If you have the jigs you should perform an alignment to see if the "shift goes away.


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IP2 placing parts shifted after servo fixed? | 1 May, 2009

I found your ealier thread, when you swapped amps for trouble-shooting, as a rule of thumb, always swap them back, otherwise, you may introduce a new unexperienced problem. The original problem, (Z2 according to the thread) will not influence H1 unless you left H1 & H2 amps swapped.

Jim Boz

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IP2 placing parts shifted after servo fixed? | 1 May, 2009

We didn't leave them swapted. They were placed in the original position until we got the replacement. What has me puzzled is that it worked for one panel correctly.

I want to answer the other posts here too ...

SA-6 is for Z2 The amp showing 7 is for the axis SX "7" means overcurrent (all axis) 40vac looks ok to me because the motor is probably not running at full speed (I could be wrong).

I did not do a "Drift" adjustment. I don't have any manuals that talk about that and there is no vibration on any axis that I can see. I was the only working on the machine and don't recall seen it crash the nozzle into any feeders.

Thanks to everyone.

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IP2 placing parts shifted after servo fixed? | 4 May, 2009


So, If all the servo amps on H1 remained on H1 and the amp you changed is on H2, I have to guess the shifting on H1 is unrelated to the servo prob. Is the shifting unsolderable? if it just looks bad but will reflow, it may have been occurring for some time. (I don't know your production environment, you may be understaffed and over worked with several lines, I don't mean to sound like your weren't paying attention to your production). Are you using pre-rotate, that helps alot to trouble-shoot or run always depending on your production needs. After that, start with the standard stuff, throw out the filters on the vaccuum generator, check pick-up, and pcb clamping. From my feeble memory, I think "C" is overcurrent, I don't remember "7". I'm also kinda sure that AC varible speed motors are varied by frequency, not voltage.

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