[roofis27]

Hi All,
I'm reaching out to the group here to see if anyone can point me at some checks to resolve a Y-axis fault on my 2007 SV-2412, Oi-Mate control.
Servo drive throws no error, servo motor and encoder work very smooth when I plug them into the X-axis outputs, but when plugged back into Y, I can get maybe two rotations out of the servo before it throws a following error alarm.
Ballscrew turns very smooth, no binding.
The one to two rotations that I get out of the servo are *very* jerky.
I swapped the X & Z MOSFET power transistors (A50L-0001-0327s) under the servo amp board, but that didn't isolate the issue - Y-axis is still jerky and alarms out.
I've replaced the encoder but no luck.

I bought a used servo controller card (A20B-2101-0013/04B) but that card wouldn't even turn the servo amps on, so was faulty.
My original controller card will power the amps, but I can't seem to get the Y-axis to turn smoothly.

This situation happened about 10 minutes after it sat for ~6 months, then moving the machine, hooking up to a new rotary phase converter, and replacing backup battery,.
All parameters appear to have been retained during the change; machine powered up, homed, I started cleaning & tooling back up, and on the next power-down/up cycle the axis faults began.

If anyone can point me at some troubleshooting tips, or has experience resolving a similar fault, I'd be grateful to hear about it.

Thanks
Ken

[generaldisarray]

"servo motor and encoder work very smooth when I plug them into the X-axis outputs" and vise versa? Does the X motor work jerky with Y?

[roofis27]

I didn't test that. Pulling the X motor out of its mount is difficult, and I doubt that it would behave differently - it seems to be a problem upstream of the motor & pulsecoder.

[generaldisarray]

I thought you just swapped the leads at the drive?

[roofis27]

Nope, that won't work - the plugs going to the amplifier are slotted unique to each axis to avoid crossing. FANUC is protecting me from myself.

[roofis27]

OK, so I had to bite the bullet and replace the entire amplifier box.
Installed it, moves Y super-smooth as new.
Now I needed to reset home positions after disconnecting encoders.
My new problems are software - the manual doesn't show resetting machine zero procedures, but a search through old forums shows at least a dozen examples.
None of which are working.
So, set PWE, then go to Param. #1815 and clear APZ bits for each axis, jog to machine zero position, set APZ bits, then cycle power.
I've tried this in a few dozen different flavors, cycling power before setting the APZ bit, testing one axis at a time, etc... but my machine still tries to send the Z-axis down to the hard servo stop and the X-axis all the way to the left stop.
Help me if I've missed something stupid, but why can't I set my axes to machine zero using any of the published procedures?
I have to admit I've been at this three days now... I'm almost out of swear words.

[BuddhaCris69]

OK, so I had to bite the bullet and replace the entire amplifier box.
Installed it, moves Y super-smooth as new.
Now I needed to reset home positions after disconnecting encoders.
My new problems are software - the manual doesn't show resetting machine zero procedures, but a search through old forums shows at least a dozen examples.
None of which are working.
So, set PWE, then go to Param. #1815 and clear APZ bits for each axis, jog to machine zero position, set APZ bits, then cycle power.
I've tried this in a few dozen different flavors, cycling power before setting the APZ bit, testing one axis at a time, etc... but my machine still tries to send the Z-axis down to the hard servo stop and the X-axis all the way to the left stop.
Help me if I've missed something stupid, but why can't I set my axes to machine zero using any of the published procedures?
I have to admit I've been at this three days now... I'm almost out of swear words.

I am also having issues resetting my machine zeros. I replaced my limit switch box and then my batteries that backed up the zero's died. I need to set my z height for a smooth tool change.

[mbservice]

Its normally under home position
Whereabouts are you

[roofis27]

Well, figured out that my machine uses soft axis limits, not physical limit switches. I had to change a bit in the parameters to stop the machine seeking the limit switches and that solved it.
I should have updated this thread a while back...
Anyway, if anyone out there is reading this, and they have an SV2412 with Oi-Mate MC control, I'm looking for a copy of the nc_basic.000 file. Mine is corrupted and I've replaced a faulty SRAM chip with a blank, clean-slate unit. I'd be greatly thankful for an attachment sent to kenneth.s.shinn @ gmail, thanks!

[cnc_doctor163]

Well, figured out that my machine uses soft axis limits, not physical limit switches. I had to change a bit in the parameters to stop the machine seeking the limit switches and that solved it.
I should have updated this thread a while back...
Anyway, if anyone out there is reading this, and they have an SV2412 with Oi-Mate MC control, I'm looking for a copy of the nc_basic.000 file. Mine is corrupted and I've replaced a faulty SRAM chip with a blank, clean-slate unit. I'd be greatly thankful for an attachment sent to kenneth.s.shinn @ gmail, thanks!

okkk i understand

Regards
Pankaj