Need Help!- Zero return problem, 11M

[force2eng]

Hello all,
I'm new to this, please bear with me if I seem overly ignorant.
I recently bought a 1990 Toyoda FH55 4 axis HMC with a Fanuc 11M. The machine boots up and I can zero return X Y & Z but the 4th axis alarms out, it rapids to the dog and decelerates as it should but immediately alarms out when it reaches the end of the dog.
Fanuc and Toyoda both told me I'm not getting a pulse feedback I need at this time, probably the encoder.
Is there any way bypass the zero return requirement so I can run the machine? I don't want to buy an encoder and find out something else is wrong.
Thanks for any suggestions,
Karl

[stevo1]

I don't know if you can bypass that or not. Are you moving off the dog far enough before trying to zero return that axis? I have had problems on my rotatry axis were I actually have to back off 360deg before the feedback would take.

What alarm are you getting? Pulse coder alarm? Or could it be your limits are set up to close to your home position?

Stevo

[force2eng]

Thanks for the reply Stevo,
I have the cable disconnected right now checking continuity. I did back away 90 deg or more before zeroing, I may try backing all the way around as you did. I do get a pulse coder alarm but I don't remember the number, I'll have to fire it up again and get it when I'm done with the cable. I was just told by a friend to change the parameter (of course I forget which one) that sets the amount of rotation or pulses or whatever after clearing the dog. Luckily, I do have a full set of manuals which is good because I'm fairly new to fanuc, most of my experience is with Cincinnatis.
Thanks again,
Karl

[greenery_fr]

Originally Posted by force2eng Hello all, I'm new to this, please bear with me if I seem overly ignorant. I recently bought a 1990 Toyoda FH55 4 axis HMC with a Fanuc 11M. The machine boots up and I can zero return X Y & Z but the 4th axis alarms out, it rapids to the dog and decelerates as it should but immediately alarms out when it reaches the end of the dog. Fanuc and Toyoda both told me I'm not getting a pulse feedback I need at this time, probably the encoder. Is there any way bypass the zero return requirement so I can run the machine? I don't want to buy an encoder and find out something else is wrong. Thanks for any suggestions, Karl

Could you tell me an alarm message

[stevo1]

I don't want to speak for Force2eng but my guess would be that he is getting the PS200 PULSE CODER INVALID ZERO RETURN alarm. Or if the pulse coder is ok but the machine is not homing out then he could be getting an overtravel alarm.

I still lean towards the PS200. I just went through this problem on a rotary table. Needed a new encoder. I still get this alarm if I am not backed off almost a full revolution of the table when doing the zero return procedure. He could just need a gridshift or adjusment of the switches. The best way is to use a scope to see if there is a signal.

Stevo

[greenery_fr]

Your problem is pulse coder error on Z and Z* signal. I think you can run machine without home by turn off option parameter 9113 bit 0 and bit 1. But when you turn off this option you can not run G54

[stevo1]

Originally Posted by greenery_fr Your problem is pulse coder error on Z and Z* signal. I think you can run machine without home by turn off option parameter 9113 bit 0 and bit 1. But when you turn off this option you can not run G54

Force2eng says that he can home the Z axis so would it be the Z axis signal???? I am guessing that his 4th axis is a positioning table or pivit of the head....this would be a seperate encoder of the Z.

Out of curiosity I show these as stored stroke options how does this allow him to bypass the zero return and what does it have to do with the work coordinate option G54-G59?

Stevo

[force2eng]

Hello again and thanks for the replies,

I just reconnected the cable, it checked out okay, and I do get the PS200 alarm, pulse coder disconnect.
I bought this machine on my own, it does not belong to the company I work for. In lieu of a raise they gave me a corner of the shop to use for myself to run side jobs. That's why I'm trying to somehow get the thing running without spending a lot of money if I can. I really appreciate the feedback you all are sending me. If anyone knows of a parameter I can try and change to eliminate the zero return requirement for the B axis, please clue me in. Otherwise it looks like I'm buying a pulse coder. By the way, where did you get yours Stevo?
Thanks,
Karl

[force2eng]

I don't think it matters but I just realized I said it was an 11M control, actually it's a 15M-A. The *$#@:* who tore the machine down for shipping removed the backup batteries so I had to get Fanuc out here to punch in the "secret code" so I could restore all the parameters. By the way, I have duplicate manuals for the 15M-A control and for the Toyoda if anyone has a need for them.

Karl

[force2eng]

Okay, I screwed up again. The alarm is PS200 pulsecoder invalid zero return.
The pulsecoder disconnect was on X axis and was caused by the geniuses who moved the machine and managed to crunch the cable with their forklift.
That was fun to track down. They also cut the multi connector cable to the hydraulic unit??????, and to top it off did not mark any of the hydraulic hoses. A few still had the factory tags on them but most did not. Like I said, it was fun.
Sorry about the rant,
Karl

[greenery_fr]

Originally Posted by stevo1 Force2eng says that he can home the Z axis so would it be the Z axis signal???? I am guessing that his 4th axis is a positioning table or pivit of the head....this would be a seperate encoder of the Z. Out of curiosity I show these as stored stroke options how does this allow him to bypass the zero return and what does it have to do with the work coordinate option G54-G59? Stevo

I mean that Z signal from encoder. In Fanuc encoder we have A,A* B,B* and Z,Z* when we zero return machine, Fanuc control need to read Z,and Z* (One revolution pulse) signal from encoder but it can not see Z,and Z* signal so an error was generated. So if he run machine without Zero return so he can not G54 and G59 so he have to use G92.

Regards

[tayfunk]

Hello,
I had same problem MICRON turn bench.
Z axis was coming to rest so close (0.1-0.3 mm) to limit switch.
Between the region, machine fistly was giving error message than pressig the limit switch because of inertia.
For this reason, If you check the limit switch, it is seemed normal.
Please check the limit switch place and if it is possible, slightly close up to axis.
Best regards
Tayfun Kusluoglu