Y Axis Over Travel when Aligning

Hey there. Ive gotten so much help from this forum by just reading. Thanks everyone so much!

I have a problem and I don’t know how to proceed.
We got a Tree VMC 750. We got it going and it’s been going good without too many issues. Today we couldn’t get it to align.

The Y Axis keeps over traveling and erroring out. I’ve slowed down feed rate to as low as it goes (7%) and it still over travels

I’m attaching the pictures of the 3 errors that pop up.

https://imgur.com/a/ObKrvmX

Thanks In advance for any help.

...thats a Following Error problem. If, this machine has the DC Servo Dynamics Amp's/Drive system locate the Y Axis board and look for the "Signal or Gain" Pot and try adjusting it 1/4 to 1/2 a turn CW (more gain).\


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The above would be a quick test if, the Gain adjustment is borderline. Other issues maybe causing your problem like dirty Motor Tachometer. A sign of a dirty Tachs is rough or jumpy axis when moving.

I’m having a hard time finding where the Gain adjustment is. I’ve linked the manual to the servos below. I’m assuming it’s in the back control pad?

And no, the axis movements are not jumpy at all. Although the machine has not been really cleaned in a while.

https://mobile.yaskawa.com/delegate/...E-S800-16E.pdf

maactec54. He's the person you want when it comes to the Yask servopacks. Speak to him.

Although servo tuning can cause those alarms, if it has been working and isn't now, seems unlikely. The fact that you said it keeps overtravelling, it seems far more likely the alarms are the result of the overtravel, and not anything to do with tuning.

Is it moving the correct direction to reference? If the TPA switch is stuck it will keep moving away from the switch until it overtravels.

Yes it does move in the correct direction. It does seem to me that it over travels.

Usually what it does, it goes all the way up to the wall, and goes back a little bit. But it just keeps going and going until it errors out.

Quote:

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Originally Posted by GaryRenalds

Yes it does move in the correct direction. It does seem to me that it over travels.

Usually what it does, it goes all the way up to the wall, and goes back a little bit. But it just keeps going and going until it errors out.

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Check your limit switches / sensors.

If it is going the correct direction, it likely isn't seeing the TPA switch input so doesn't reverse and complete the Align cycle.

Switch may not be closing (or I have seen the dog fall off so switch isnt triggered). I've also seen the cable fail so even though the switch is working the signal can't get to the input card.

I believe your machine has 24V I/O...are you getting the 24V input to the card?

Quote:

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Originally Posted by maver1ck

If it is going the correct direction, it likely isn't seeing the TPA switch input so doesn't reverse and complete the Align cycle.

Switch may not be closing (or I have seen the dog fall off so switch isnt triggered). I've also seen the cable fail so even though the switch is working the signal can't get to the input card.

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If they are NO type switches it could have a broken wire. Wire breaks only usually get picked up by controllers if they are NC type swiches.
That's why many of us use NC.

...for what its worth here is a Operator Manual for VMC750. I see some Axis Display etc viewing on page 3-27. Some where maybe you can view Switch conditions are ON or OFF using the Diagnostics
http://websystem.gismo.se/gismo/file...G%20MANUAL.pdf

If you have release 2.xx software as shown in the lower left corner of the 'SERVICE' screen; then look in
System Configuration > Machine Application > TAB#2 > Is the 'Overtravel Switches' 'Checked'.
If other software contact Fives-MSI Tech Support at 1-800-934-0735 8am-5pm EST