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IndustryArena Forum > MetalWorking Machines > Sharp CNC > Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate
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  1. #1
    Join Date
    Feb 2013
    Posts
    16

    Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    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

  2. #2
    Join Date
    Mar 2017
    Posts
    314

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    "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?

  3. #3
    Join Date
    Feb 2013
    Posts
    16

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    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.

  4. #4
    Join Date
    Mar 2017
    Posts
    314

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    I thought you just swapped the leads at the drive?

  5. #5
    Join Date
    Feb 2013
    Posts
    16

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    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.

  6. #6
    Join Date
    Feb 2013
    Posts
    16

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    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.

  7. #7

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    Quote Originally Posted by roofis27 View Post
    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.

  8. #8
    Join Date
    May 2016
    Posts
    526

    Re: Help! Y-Axis Faults: Sharp SV-2412 Fanuc Oi-Mate

    Its normally under home position
    Whereabouts are you

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