Need Help!- FANUC OT ALARM 520 OVERTRAVEL +Z

[berthagua]

WE HAVE IN FANUC OT ALARM 520 OVERTRAVEL +Z WHEN TURN ON . IT REALISES THE USUAL PROCEDURE FOR THIS ALARM BUT I COULD NOT CLEAR IT. LATER IT MODIFIES THE PARAMETER OF SOBRELIMITS BUT CONTINUOUS THE ALARM. IT SEEM THAT THE PROBLEM IS A CARD, BUT I DON`T KNOW WICH. MOTHER BOARD? MEMORY BOARD?
THANKS

[avtechmachine]

First use MPG move all three axis to center, turn off control, press and hold down P, Q and CAN key turn on control, wait untill control completely on then you can let go the P, Q, CAN
Zero return all axis, it should work

Ahn Vuong

[Superman]

And if that don't work, wind the leadscrew by hand while the machine is turned off.

Also check that the limit-switch is not jammed down

[HAR THA]

Turn off your machine and then you turn the Z_axis ball screw to go down the spindle till the limit switch is free.Then switch on the machine. If it is still don't work, you need to change the Z_axis parameter. After you turn the ball screw, go to the parameter page and then change the Z_axis limits value. Then restart the machine. It will work.

[roshanlal]

Originally Posted by berthagua WE HAVE IN FANUC OT ALARM 520 OVERTRAVEL +Z WHEN TURN ON . IT REALISES THE USUAL PROCEDURE FOR THIS ALARM BUT I COULD NOT CLEAR IT. LATER IT MODIFIES THE PARAMETER OF SOBRELIMITS BUT CONTINUOUS THE ALARM. IT SEEM THAT THE PROBLEM IS A CARD, BUT I DON`T KNOW WICH. MOTHER BOARD? MEMORY BOARD? THANKS

you enter the parameter no.701 to 99999999 and make zrn and put original value
roshanlal74@yahoo.co.in

[hrh]

You can change parameter 65 bit 3 = 1.
Soft limit will then only be checked AFTER the machine is referenced.

[chich2]

I had this same thing hapen to me yesterday to a FANUC OT-C. I'd select mode to reference the axis's. X axis worked but Z would trip and alarm saying Alarm 520 Z+ Over travel. Once reading this thread, I powered down the machine, Powered back on holding on "P" and "CAN" then I tried to reference again and It worked perfectly.

Thanks for the info,
Chich

[ronniekav]

Originally Posted by chich2 I had this same thing hapen to me yesterday to a FANUC OT-C. I'd select mode to reference the axis's. X axis worked but Z would trip and alarm saying Alarm 520 Z+ Over travel. Once reading this thread, I powered down the machine, Powered back on holding on "P" and "CAN" then I tried to reference again and It worked perfectly. Thanks for the info, Chich

I too had this problem and holding "P" and "Cancel" worked. Can someone tell me what the problem was and what this procedure did?

Thanks