mori turret spinning

[claya]

Mori, AL-20 W fanuc OT-mate. Turret spins indefinitely when indexed. Prox switches seem to be working? maybe?

Found some broken prox switch wires, repaired. Turret still spinning. Any ideas?
Should the output voltage be 0 when the prox switch is "closed", 24V when open? I am measuring ~17V when "closed".

ca

[underthetire]

They probably are supposed to be that way, can't remember for sure, because about the 0 control is when they were switching that stuff around. I would also check the bestac relays, those can stick, and the braking contactor for the turret.

[claya]

A rat nested on top of the warm turret motor, conveniently chewed through all 4 prox switch output wires, and one 24V wire. Is it possible there is a parameter flipped? The turret index light is blinking. But the home/index prox. switch is not on, either. so that is troubling.

scares the crap outa me to stick my head in there with the machine on.

and,
every year I have to switch rat poisons, otherwise the next year it is just is like feeding them.

[DSIF]

The only times I have ever seen that happen,there has been metal on the end of the prox switch. The rat problem complicates your situation. Did you solder the bad wires back together? If not,that could also be a problem.
Dan

[claya]

Soldering, really? They are crimped.

What strikes me as very odd is of the 4 switches, 2 are 24V when closed, and 2 are 7V & 9V when closed...Does that sound like a bad switch, or a funky/dirty relay downstream?

I can't find the DGN for the LS10 (index) and LS14 in the book, only the LS10 & LS14 relay DGN's

[Waynno]

Longshot, But try setting the manual turret position to "1" then index turret manually

The older ones if out of sequence needed to time them selves back to the number 1 position in order to get everything back in sync

[claya]

Originally Posted by Waynno Longshot, But try setting the manual turret position to "1" then index turret manually The older ones if out of sequence needed to time them selves back to the number 1 position in order to get everything back in sync

The turret spins in manual (from position 1) or MDI. For some reason it is missing the index. The output voltage switches from 0V to ~7-9V on the index prox switch, and one other. But is 0v to 24V on the other two prox. switches... Makes no sense.

Can I jump the bestact relay to test?

Where can I buy prox switches, or bestact relays? you know which is the braking contactor?

[underthetire]

Originally Posted by claya Soldering, really? They are crimped. What strikes me as very odd is of the 4 switches, 2 are 24V when closed, and 2 are 7V & 9V when closed...Does that sound like a bad switch, or a funky/dirty relay downstream? I can't find the DGN for the LS10 (index) and LS14 in the book, only the LS10 & LS14 relay DGN's

Bad switch/cable. Probably something in the terminal box. Should all be 24VDC. Blinking light as indexing means the machine is searching for tool 1 to zero the turret. Prox switch or I/O board problem for sure.

[Perfect Circle]

All prox's should read 24v's. I found some at Motion Industries that where compatible. Are they a 2 wire or 4 wire config. and is it a grounded or ungrounded power supply for the 4 switches..I've seen some on an ungrounded p/s ground out and that caused the drop in voltage and crazy behavior.
Hope that helps you in someway.

Good Luck~!

[underthetire]

Factory would have been three wire. The update (replacement was 2 wire) and ALL World was the cheapest I ever found for replacements. You will need to determine if they were NPN or PNP from the prints first.

[cncserveng]

it depends if the prox switches are normal open or normal closed type, if normal open they give 24v out on the black wire (signal) when they are made. If they are normally closed; they already have 24vdc on the black wire until they are made when the voltage = 0v.

Is the turret index hydraulic or electric motor type ?

Check contactors and/ or relay contacts are not welded together, either on the rapid rotate or creep feed.

you will need a "truth table" to check the counter for the various turret station positions.

you may have one on the turret page of the electrical diagrams.

[claya]

Originally Posted by underthetire They probably are supposed to be that way, can't remember for sure, because about the 0 control is when they were switching that stuff around. I would also check the bestac relays, those can stick, and the braking contactor for the turret.

Interesting. I can brute force the turret to the correct position, but sometimes it takes about a minute to seat... Almost like there is no hydraulic pressure (but there is plenty, it wouldn't spin otherwise) A Mori tech said the most common problem on this particular lathe was the turret brake contactor.. How do I check that?
I swapped prox. switches with the z-axis. (Honeywell vs omron) Didn't fix anything, but the slow seat may have appeared the same time.