random E stops

[Thomas strembitsky]

this just started happening but in the middle of cutting the cnc will randomly put its self into e-stop. is there anything I can do diagnose this issue? the e stop button isn't depressed. it happens when the machine gets to the upper left of the table. we are running a CS43

[Clint Buechlein]

Thomas,

When it goes into e-stop, go to Maintenance, PLC, PLC Screen and see if there is an error message displayed. And when you say upper left, do you mean where the spindle homes at? Everyone defines upper/lower and left/right differently so just want to clarify. My first thought is that it is trying to go into the tool changer safety zone.

-Clint-

[Thomas strembitsky]

when I say upper left I'm using the control nesting version of upper left

[Thomas strembitsky]

okay it happened again and now I have the error message

[Clint Buechlein]

Thomas,

A few things to try and possible issues. The first thing to try is to see if its a tool holder issue. If it seems like the issue is happening with the same tool holder every time that could point to the issue. If it isn't tool holder related, then next possible issue is the drawbar switch needs to be adjusted, or it has a bad connection. There are other possible reasons for the error, but those are the most common

-Clint-

[Thomas strembitsky]

I swapped out the tool holder for our outline cutter and ill see how that goes for us. how would I check the drawbar switch?

[Thomas strembitsky]

the issue has returned again i'm attaching a copy of the plc history text file.

seem we have been having the "Z Draw Bar 1 UP switch not closed 1 second after Drawbar DOWN output turned OFF (Output 9 OFF & Input 18 open "
error periodically but then it started happening a lot around may of this year and the machine will go into e stop when it gets the " Z Draw Bar 1 not UP while spindle moving (Input 18 open or 17 closed" error twice with in a minute

[Thomas strembitsky]

PLC History.txt

(389.62 KiB) Downloaded 1277 times

PLC History.txt

(389.62 KiB) Downloaded 1277 times

[Clint Buechlein]

Thomas,

The next most likely thing to do is adjust the drawbar switch. It is located behind a cover on the spindle and labeled with a #1. The sensor has a lock nut and an adjustment screw that is on an eccentric. Loosen the locknut and adjust the screw until the input turns off on the input/output screen. You can verify which input it is from the I/O List. Once it turns off, slowly turn back the other direction until it comes back on again, then go an additional three degrees or so and tighten the lock nut.

Depending on your level of comfort working on the machine, it may be worth it to have service take a look as this involves disassembly the front of the spindle.

-Clint-