Problem- need help please

[productservice]

i have a romi 760vmc with a fanuc 21i-mb control.the tool carousel came in and the spindle came down on top of it. i was told by the romi dealer in my area he and the factory never heard of this.fanuc service told me that it has to be on the romi side of the control. I have the damaged parts repaired but i don't want this to happen again. I am at a loss why this happened. If any one can steer me in a direction to look it would be appreciated.

[cncsnw]

Did this happen during a tool change (e.g. the carousel was supposed to be in, and the head was supposed to come down, but the head came down too far)?

If so, you may have a parameter-setting error: somewhere there is probably a parameter that sets the Z position for tool changers. If it gets corrupted (set to a larger negative value) then the head would come down too far.

Or did it happen during normal run (e.g. the carousel was supposed to remain out, but moved in and got in the way of the head)?

If so, you may have a wiring fault or PLC output fault that allowed power to the carousel slide when it was not commanded to do that.

Did anyone see the crash? What was the machine supposed to be doing at the time?

[Al_The_Man]

Exactly as cncsnw mentions, you have to do some detective work to find out what sequence or action was being performed correctly and what was not.
Also, is it machine error or human error?
When the PMC logic/ladder is written for a machine, the MTB tries to look for all eventualities and builds in safeguards into the ladder.
Sometimes it is very tricky to anticipate every little thing that may go wrong, or make allowances for someone doing something totally against the normal procedure.
If it turns out that this is the case, the MTB may be persuaded to make a ladder change.
Al.

[productservice]

forgot to put in that the tool was already in the spindle and the operator input a manual tool change.that is when the carousel came in before the spindle came down.

[cncsnw]

That sounds like it could be a ladder loophole. I would try turning the feed and rapid overrides way down, and see if I could duplicate the problem (being ready to hit the big red button as soon as the head starts down with the carousel in).

[mactec54]

productservice

The Romi Fanuc is very good I don't think it was a machine problem, but some time things do happen.

If the operator put the tool in the spindle in manual mode , the machine would not know there was a tool in there, so it was trying to do a normal tool change, you can see the picture, of the machine going in to pick up a tool, but there was one in the spindle it did not know about so crash

Don't let them do that, or it will happen again, there's no way the machine can know that there is a tool in the spindle when the operator puts one in there

Do you have in MDI mode a button for carousel forward & reverse(or it might say on the button next tool etc) you should use this for loading tools, changing tools etc

If you want to just get a tool from the carousel then you can do it the way the operator was doing it, But WITH NO TOOL IN THE SPINDLE

This is the most obvious but there is always the the though that it could be something in electronic

Manual tool put in the spindle press wrong button= CRASH