Need Help!- Electrical Gremlin Please Help

[Ls1wot]

Ok, so i picked up a 1990 VF-1 that was broken thinking it would be an easy board swap to fix it , The original problem was the x axis cable shorted out due to the cable being worn, The guy i bought it from put a new cable in it and changed the servo drive card but hooked it up wrong some how. This somehow blew out the monitor and motif and this is when i bought it. Currently I have a problem with the z channel on x & z axis dropping and i believe it is due to interference as when the spindle is on or any of the axises move there is fuzz or snow across the screen. I have replaced the video card, motif and processor (upgraded to newer 1996 specs with 8.31 software). The haas tech has been out here four times changing complete motor assembly's, I/O Board, Servo drive cards, Video Cable, Ran many different grounds all over the cabinet with no change, changed the rectifiers, I have checked the output of all the connections from the low voltage power supply and all are as they should. Now since the processor upgrade i get a ground fault detected alarm and a 112 no interrupt alarm. But if i put the old processor back in the new alarms do not come up, But that processor has memory issues. Sorry for the long story i just dont know where to look anymore and the haas repair center has since given up on my machine. Please help i need to fix this machine.
Thanks

[Haas__man]

OK - the fuzz on the screen when the spindle is running is happening because the monitor has been replaced with a new style one. Haas do a replacement cable that will stop this from happening but I am pretty certain that other than fuzz on the screen it will not cause axes problems. It is definately worth getting the cable though - I will try to get you a Haas part number for this.

Can you explain to me a bit better what is happening with your x and z axes? Is the Z axis dropping? What alarms do you get? Do you get x axis z channel alarms and do you get z axis z channel alarms? how often do you get these alarms? will the x or z axes move or run at all? does the y axis work ok?

The ground fault detect alarm is probably just beacause the software is different to what you had before. What software did you have before? The ground fault alarm can just be turned off - since we already know there is not a ground fault.

The 'no interrupt' alarm is a tricky one. Sounds like a problem with low volt power. How often do you get no interrupt alarm or does it not reset? To possibly fix 'no interupt' - try this:
Locate the power distribution PCB
It is top right side of electrical cabinet
It has around 3 circuit breakers on it including 'coolant' 'main transformer'
Once you have located this PCB (and with machine powered off)
Unplug each plug and then plug it back in - do this three or four times on each plug. Only do this with plugs on the left side of the PCB. You can do it with all plugs if you like - but the issue is probably with one of the plugs on the left side. The reason for doing this is the pins in the plug are not contacting properly due to oxidation or just weak spring in the plug.


Hope this helps

[Ls1wot]

Haas man Thanks for the reply!!
i disabled the ground fault detector i had software series 1 before lol.
the z channel alarms i get are 140,141,142 and also 153,154,155 The y axis will move about 6 to 12 inches before alarming out and the x and z only go about an inch. if i disable the z channel i have no problems but still has the fuzz. as for the 112 alarm i changed the video card this morning to my old one which isnt really compatable with it but it will go 15-20 minutes before that alarm shows up instead of less than a minute. So i am thinking it is the video card? just need a new correct one hopefully. as for the pcb i dont have any plugs to unplug there all screw on connectors, i have the really old setup the power supply looks identical to the power supply of a computer like and atx case. any other ideas i had the same problem with the old processor dropping the z channel. could the main transformer be causing this? is there a way to check it without just buying a new one?
Thanks Again for all your help

[Haas__man]

I'm nearly certain that all your axis alarms are due to parameters being set incorrectly.
what are parameters 12, 26 and 40 set to?

[Ls1wot]

All three are at 8000. hopefully this is the problem?

[Haas__man]

try setting all of them to 4000 instead. Let me know how it goes.

[Ls1wot]

instantly get z channel missing.

[Haas__man]

after changing the parameters - turn off the machine - then try again.

[Ls1wot]

same thing

[Haas__man]

am certain that your problem lies with parameters. You would have to be very unlucky to have a problem with all three axes at the same time. If you put the original processor back in - do you still get x y and z alarms to do with z channel?

[Haas__man]

Also - you say that the service Haas tech fitted complete motor and cables? Are the new motors and cables still on the machine? or do you still have original motors and cables on the mahcine?

[Ls1wot]

yea i get the same errors with the old processor. i was changing the processor in hopes of fixing this issue and since it had memory issue i figured that it had to be the problem.