What's new
What's new

Fanuc Wire EDM Pulse Ccoder Alarm

Krispee

Plastic
Joined
Oct 31, 2015
Hi.
Just recently our Fanuc Wire EDM W1 (1990-03) developed a pulse encoder alarm. We had just finished moving the machine and we switched it on for the first time when up came a '317 X ABS. Pulse Coder' alarm. I hit reset and the alarm cleared. After that I ran a G28 and referenced the machine and after that I rebooted and it worked just fine, no alarm. I then set it up on a job which ran overnight and shutoff on automatic. In the morning when I switched it on again the screen was fragmented, mostly black with fragments or thin strips of colours spread across the screen(it's a replacement LCD for CRT screen from DNC Electronics here in the UK). Anyway, rebooted the wire and the screen was fine and I carried on with the next job. It started running then suddenly stopped, with the used wire bin still running but no machining and no response from the panel by the screen. The machine couldn't be reset, nothing worked. I rebooted the machine and the screen came back fragmented as before but this time the machine was completely unresponsive, nothing worked. Rebooting made no difference, same fragmented screen, same unreponsiveness.
We did see a red LED on the motherboard, just below a green one. We checked the PSU on the floor of the cabinet, that was showing 24v as it should. Plus, there was an SPA8 connector disconnected from the Remote Buffer board but it looked like it had been disconnected for a long time. Still, my boss decided to plug it back in and suddenly it booted back up perfectly. Then he disconnected it again and still it started fine. Everything now works just fine, panels all working, machine moving etc. The red LED on the m/board has also gone. Haven't tried machining yet, that will be next Monday, but just getting it booted back up was a step forward.

During this time I was in conversation with a Wire EDM expert on the phone and he was just as perplexed by the problem.


Does anyone know what the Remote buffer board does?
What is the SPA8 connector and would disconnecting it make any difference?
Why did I get the Pulse Coder alarms?
Or are the alarms a byproduct of us having moved the machine?


Attached some photos so you can see the alarms etc.
Any thoughts welcome.
Kris.
 

Attachments

  • wireedmfault_1.jpg
    wireedmfault_1.jpg
    371 KB · Views: 11
  • wireedmfault_2.jpg
    wireedmfault_2.jpg
    437.9 KB · Views: 10
  • wireedmfault_3.jpg
    wireedmfault_3.jpg
    992.7 KB · Views: 11
  • wireedmfault_4.jpg
    wireedmfault_4.jpg
    528.5 KB · Views: 11
I'm talking out my ass here. My thought is the remote buffer might be like an auxiliary memory board that it doesn't use all the time? Maybe there is corrupt memory on the mainboard and it's freaking out when it's using it, and having the remote buffer connected let it access additional memory that wasn't corrupted.
 
I'm talking out my ass here. My thought is the remote buffer might be like an auxiliary memory board that it doesn't use all the time? Maybe there is corrupt memory on the mainboard and it's freaking out when it's using it, and having the remote buffer connected let it access additional memory that wasn't corrupted.
Hi.
Thanks for replying. We have an EDM expert coming down tomorrow to have a look at it. I was in touch with him the past couple of weeks with no solution to the problem. He thought it might be the graphics board but couldn't be sure until he'd examined the machine.
Hence the visit.
Interesting reply, I can what you mean. I'll let him see your reply and see what he says.
Thanks again.
 
Well, it does seem to be working again now. The EDM specialist came and took the main board and everything on it to be tested. It turned out to be fine, nothing wrong with it. Then they thought it might be the new (ish) LCD replacement screen, and since it had a 3 year warranty on it they gave the EDM guy one to try out; but it wasn't that either. Then the specialist tried depressing the e-stop, and a Delete+0 startup, and it worked, apart from having nothing to work with anymore because all the parameters and servo parameters, and everything else the machine used to have, were gone; it was at least working.

So, we don't really have any particular error to point to. We've tried re-starting it a few times to make sure it still booted correctly. Hopefully it will still be fine after a few days turned off.

I'm also really annoyed, as the EDM settings the machine had to cut particular jobs are all gone. So, I'll have to work them, and the individual offsets, all out again. I'm really really bummed about that.
But at least it's working.
 
Well, we're back where we started, screen fragmented on startup, no cluck as the servo drives engage, no response from the keyboards around the screen.
We're stumped as to what's causing it.
 
I just got the same error code. My machine was working ok(other than a blown backlight CCFL,ordered). Turned it on today and I get the 317 ABS.Pulse coder.
You won't believe this. I tried to do a reference point return several times to take it to X0,Y0. It kept overshooting the X0. Turned on,off, several times. Threw the breaker. Several times. Just as I started to type this reply I went to take a photo of the error message. Restarted the machine. Did one more reference point home and it cleared. Stopped right on X 0 machine points.
I'm happy. Now hope all stays and the ccfl is just a matter of replacement.
Turned the machine on and off and no more error. Lucky break again. Please get in touch. Maybe we can help each other further into the future.
 
I just got the same error code. My machine was working ok(other than a blown backlight CCFL,ordered). Turned it on today and I get the 317 ABS.Pulse coder.
You won't believe this. I tried to do a reference point return several times to take it to X0,Y0. It kept overshooting the X0. Turned on,off, several times. Threw the breaker. Several times. Just as I started to type this reply I went to take a photo of the error message. Restarted the machine. Did one more reference point home and it cleared. Stopped right on X 0 machine points.
I'm happy. Now hope all stays and the ccfl is just a matter of replacement.
Turned the machine on and off and no more error. Lucky break again. Please get in touch. Maybe we can help each other further into the future.
Hi Dan.
Glad to hear your sorted your error out, ours weren't quite the same as our error turned into the fragmented screen, but sometimes these things can overlap. We also have ours fixed. Turns out it was a fault on the base board, or the Master PCB, probably caused by us moving the machine. There is a company that repairs older style boards from older machines in this country. The boards are expensive, our Master PCB replacement (repair and exchange) cost us £1300 or so, not to mention a couple of visits from the EDM engineer. All in all my boss is tearing his hair out a little bit, but no choice, we use our Wire a lot these days.
Gladly help you out any way I can. I'll answer your message next.
 








 
Back
Top