Blackout on a 6m

[autotrim]

hello!
I have Makino with a 6m, i use it to recondition engine blocs. I have had some problems with the controll, it stops taking commands! I hear a pulse when i start it up, and as long as this puls goes it is ok, but suddenly the pulse stops. Then i have to push on the ROM`s on one of the boards, then after a startup it is ok for a while. it is tryed cleaned up but it is not any better. THEN one morning after startup it just shuts down?, the display says system ready, then after ca 1min it shuts down. This happens every time. A tecnichan tryed to fix it, changing the power unit but no luck.
This makino is very dear to me so if anybody could help.

[lakeside]

Like an old dog that's loved by all. One day you will have to put a bullet in the controller and upgrade

[Al_The_Man]

Check the voltage on the output of the power supply before and after if happens, the three copper bus on the right hand side (usually) the centre is common the top 5vdc and the bottom 24vdc, I had one recently that it was a short circuit on the 24vdc and it would shut the power supply down, I disconnected the 24vdc connections until it came up, and then traced the offending source.
Al.

[Dan Fritz]

When the control shuts down, do you get any alarms, or does the CRT go dead also? What do you mean when you say "you hear a pulse" ?? Is this a hydraulic pump running?

If you can see the diagnostics screen, you should be able to see if the CNC has gone into E-stop for some reason. Many machines use limit switches on each axis that will put the control into E-stop if the usual overtravel limit switches don't stop a runaway servo. Any of these switches can fill with oil or coolent and shut you down.

If the control just shuts off, then you probably have a bad power supply or possibly a bad "off" switch. There is also a relay circuit for the ON/OFF buttons that can go bad. There should also be a red LED on this ON/OFF circuit board that indicates a shorted condition on the power supply. If you see this red LED, you'll have to turn the control off/on to reset the relay. Otherwise, the control wont' turn back on again.

Give us some more detailed information and maybe we can help you with this.

[autotrim]

Thanks for helping.

I dont get any alarms, it is like you push the off button on the controlpanel.
The pulse i hear is a relay, on one of the boards, if i dont hear this relay it wount take any commands. There is a small display on the side of the controll panel for the toolshanger, it light`s there in the same frekvens as the relay.
I dont have the manuals on the machine. I dont know how to read the fault codes, but the leds on the diagnostic go out when the controll shuts down.The machine shop that i got it from, have had problems with the toolshanger ever sinse the machine was new. Is it possible that this relay got something whit the toolshanger?
Do i have to set the axis in cero position when i turn it off?
My machine got a backupbattery on a small card attached to the cards with ROM`s, does this mean it will loose it`s memory if this battery goes out?
Is it possible to buy parts for this controll? I am thinking of buying a simmilar makino with the same controll.

There is a red light that comes on, when the controll shuts down. We meassured all voltage outputs on the power supply, before, under and after, but didnt find anything. BUT there is 6 cord`s going from the power supply and in to the on/off circuit board, on pin number 1 i meassure ca 4 volts when it shuts down?.I think this is what shuts it down.

Thanks

[Dan Fritz]

I would guess that you have a short-circuit somewhere, possibly in a limit switch or a 24V device on the machine interface.

The Fanuc 6 power supply has +5v output for the circuit boards, and it has +24v output for the interface devices. Your limit switches on the machine and all the switches on your tool changer will use this +24v power supply. Any short of a +24v wire to ground will cause the problem you describe.

Inside your Fanuc 6 control, look for a small circuit board, which is attached to the "ON/OFF" buttons. There is a relay on this board marked "RY1". If something shorts on the +24 side if the power supply, the RY1 relay will turn on and shut the control off. If RY1 is shutting down your control, the only fix is to find the short on the +24v circuit and replace the component.

Most of the time, limit switches cause this problem when they fill up with coolent or oil.

You don't have to zero-return the machine when you power off. You do, however, need to zero-return after you turn it back on.

[autotrim]

Thanks for helping Dan.

There is a red light that comes on, when the controll shuts down. We meassured all voltage outputs on the power supply, before, under and after, but didnt find anything. BUT there is 6 cord`s going from the power supply and in to the on/off circuit board, on pin number 1 i meassure ca 4 volts when it shuts down?.I think this is what shuts it down.

Thanks

[Al_The_Man]

The last problem I had like this it was the 24v feeding a 12v regulator that had shorted on the CRT chassis card plugged into the MB. Replaced the 7812 and everything fixed.
What is the part number of the On/off card (input unit)?
Al.

[autotrim]

hello al the man
The number on my on/off card is A20B-0007-0340/04a.
What do you think about the 4 volt signal that seems to shut down the on/off card? It is on pin nr1 i get this signal.

[Al_The_Man]

I could not identify which input unit you have, Fanuc made several, but there are some that have two test pins marked P1 & P2, these are there to use for service, if temporarily shorted out they disable the effect of RY1, this allows the system to come up and trouble shooting further, This, if used should only be used temporarily to enable trouble shooting, and should be used carefully, I have used these before to great advantage.
Al.

[autotrim]

Hello
I have gone thru all limit switches and all switches on the tool changer, and all other switches i can find, can`t find anything wrong. Sometimes it stays on for ca 4min and then i am able to run the machine, and everything seem to work.
There is a 6 wire connector named cp1 going from the on/off board, to a connector called cp34 on the power unit, on pin number 1 i get a 5 volt signal, i think this is what shuts the power off.?. One of the start ups today i got a alarm message, this was 401 servo and 402 servo?. I tryed to find something that could tell me how to read the diagnostic on the makino, but cant fint anything. Anyone got any ideas?
What about retrofitt, any tips?

[lakeside]

Call Makino ask who there know in your area Boston,Mass is a long way from Norway if your just going to upgrade to say a Fanuc 11M controller almost any machine dealer in you Land far sway would be a source of info