Runaway Servos

[Mark18969]

I have a Milltronics machine with the Centurion 1 control. The batteries dies on the motherboard and we lost all the settings. After replacing the batteries, and reloading all the bios settings, when we start the machine and hit the reset button, all 3 axis's rapid in the wrong direction. Even before you hit the home button. Milltronics wants to have the whole box sent in to look at it for a fee. It's an older machine and I don’t want to put allot into it.

Anyone have any ideas?

[Torsten]

Originally Posted by Mark18969 I have a Milltronics machine with the Centurion 1 control. The batteries dies on the motherboard and we lost all the settings. After replacing the batteries, and reloading all the bios settings, when we start the machine and hit the reset button, all 3 axis's rapid in the wrong direction. Even before you hit the home button. Milltronics wants to have the whole box sent in to look at it for a fee. It's an older machine and I don’t want to put allot into it. Anyone have any ideas?

Servos tend to run of at full speed when they loose the encoder signal.
May want to check the encoder wires for a loose connection somewhere.
Good Luck

[Al_The_Man]

Sounds like it could also be parameters, the ones indicating direction of travel for +- dir.
Al.

[Mark18969]

Thanks for the response. I am leaning to a parameter setting but getting no help from Milltronics. I have had a similar problem in a 2 axis machine, motherboard batteries dying, and the axis going the wrong direction. Hurco sent me the parameters and that fixed the problem. But no such information from Milltronics.
Anyone out there with a Milltronics have any parameter settings that would help me out? I load the disc that came with the machine, but still feel there is something not set right.

[franchcnc]

The servo runaway is due to missing +/- 12vdc at the axis controller cards in the control. I really don't think it is in the bios settings. Most often when the Motherboard batteries on that version of control fail they will leak and damage the board( I assume it is the blue cylindrical battery). Other possibilities are a bad p/s or you improperly connected the p/s to the motherboard.

[Mark18969]

Thanks for the feedback. I will check the +/-12 volts. The diagrams for this I have are very limited and I am not sure where to check the 12 vlolts. The motherboard had corrosion on it and we had it repaired. The we had the runaway servo problem. The I replaced the motherboard and have the same problem with the replacement board.

Is the powersupply connection to the motherboard just a plug?

[franchcnc]

The p/s has two plugs that connect next to each other on the motherboard.
Make sure the each of the plugs black wires are next to each other(black wires to the center). All the voltages are labeled on the p/s, +12vdc is yellow.

Good Luck.

[Mark18969]

Thanks again for the feedback. My person working on th machine informed me that he did check the +/-12 vdc, and the plugs are in the right location. They have been tywrapped together for so many years the just fall into the right location.
You made a comment about the controller cards. Is there a location we can check to make sure they are getting the right voltage at their location? Or do you have any further suggestion? I see that one controller card does more then the other 2.

Again thanks for you help.

[franchcnc]

The X axis acroloop card also controls the spindle. Do all three have the green leds lit? I will have to look where to check voltages on the boards, maybe someone at Milltronics could answer that.
What motherboard/processor was in it and what did you change it to?

[Al_The_Man]

So this has an Acroloop card?
I have a couple of machines I retrofitted using Acroloop, what is the model of the card?
Probabally a ACR8000?
You can disconnect the analogue to the motor drives separately from the encoder input.
It is the large D plug on the bracket end of the card.
If you can go to a DOS prompt, you can test the card with a service program, or fit it in an ISA slot PC that runs DOS.
Al.