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  1. #1
    MO Man is offline Plastic
    Join Date
    Jun 2009
    Location
    MO. , U.S.A.
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    14

    Default VTC-16 Tool Changer prob.

    Hi all,

    I have a VTC-16 with a tool changer problem. The problem is, when we rotate the carousel it drifts and gets lost. Also if we extend the mag & rotate
    it will try to retract each time it passes a tool position, and it will drift off when we stop rotating it.

    We have checked prox switches and other sensors, index motor and the brake for the moter on the tool changer. everything checks out, and we still have the problem.

    Any suggestions will be apprecated.

    MO Man

  2. #2
    David Carlisi is offline Stainless
    Join Date
    Nov 2007
    Location
    Alpharetta, Ga USA
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    1,612

    Default

    Have you tried calling Mazak technical support yet? If you get the right guy on the line, they can be very helpful.

  3. #3
    Chippy is offline Plastic
    Join Date
    May 2007
    Location
    North USA
    Posts
    33

    Default

    Some tool changers have a rotary encoder that sends the position feedback. When did this problem start? Just came in one day and it started or was there a crash?

    Regards,

    Chippy

  4. #4
    MO Man is offline Plastic
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    Jun 2009
    Location
    MO. , U.S.A.
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    14

    Default

    Yes had a X Mazak tec. in the shop and still no go. Will he worked for Mazak for 15 + years, and is very familiar with the VTC.

    This tool changer has a sensor for tool # 1 and a tin flag that rotates with the changer with a prox. switch that is suppose too stop it for the other 23 tool locations. The problem started after the mach. set iddle for about 2 weeks, after running with no problems befor that.

    Thanks for taking the time to reply
    MO Man

  5. #5
    dave arthur is offline Plastic
    Join Date
    May 2011
    Location
    united kingdom cheshire warrington
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    4

    Default

    hi not quite the same problem, but i turned off my bridgeport 560 one night, and the next morning, tool changed but the wrong one, and kept doing so, eventually turned out to be one of the 2 carousel sensors, ( I THINK) one counts, inboard one,and outside one, actively looks for tool 1 every time it starts up, this was the faulty one,hope this helps somebody,

  6. #6
    hitandmiss is offline Stainless
    Join Date
    Jul 2010
    Location
    Rochester, NY USA
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    1,428

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    Hi MO Man,

    I assume you have an M-32B or possibly a M Plus control? (the M-32A has a floppy drive on the front of the CNC card cage) And your location you list has had some bad storms around the time it was off??? Or maybe a one time battery alarm when turning on after the couple of week idle time??

    I again assume from your posts that the obvious has been done, and the troubleshooting gets more complex.

    I have worked on several VTC-20's, Very similar just a larger machine. None I have have worked on had an air to air heat exchanger, just fans that draw shop air thru the electrical enclosure. If this is the case, look carefully at the large board below the CNC chassis full of relays, for burns. Even shine a strong light behind the board and look for dark areas apparing as irregular dark shadows versus the defined lines of the circuit traces. I have replaced several of these boards that had burns causing strange problems. When 120 VAC gets crossed up with the 24VDC circuits takes out the input/output board in the CNC. All the sensors and solenoid control goes thru this board.

    If there have been bad storms, even with power off, memory can become corrupted causing strange problems. A weak battery also causes this. For the M-32B and M Plus, home the machine, backup all programs tool offsets and then another backup with a small program and anything else you can check on the save screen, tool offsets, tool library, parameters etc. If using a microdisk make 2 copies and compare each one to memory. Obtain the initalize control proceedure and also the proceedure to save parameters to flash and save to flash. Mitsubishi is at 1-847-478-2500 and select tech support. You need the machine S/N and it is a free service from them. When cycling power for the initalize there is a small toggle switch on the CNC power supply you can use, lift to turn on and down to turn off.
    Make sure you use correct proceedure for the M-32B (MC-161 card) as the MC-111 card for the M-32A does not have flash. Re-load from flash, clear program file, etc.
    There will be some fiddling getting the control to know what pocket the tool magazine is on and try only an air tool change at first (no tools in magazine).

    The M-32A (MC111 Cpu) does not have the program that runs the control in proms, it must be loaded from floppies using the drive on the card cage. I think there are 2 disks to do this, they are a non standard format and may be lost by now, or unreadable due to age. Proceed with caution, because the control will be brain dead after the switches are flipped and power turned on. The only way to bring it back is with those disks!!! There are machines at used machine dealers that are brain dead because of this, they don't sell for obvious reasons. Replacing those disks is $$$ and down time. Again be careful.


    I am referring you to Mitsubishi not Mazak for the initalize proceedure. They made the control and many Mazak tec's refer this to Mit. if it needs to be done. The tec's there can guide you on the phone better than we can guide you on this site, if you need it. And their tech support is free!

    I hope the detail isn't overwhelming,

    Bill
    Last edited by hitandmiss; 05-27-2011 at 08:26 PM. Reason: typos

  7. #7
    cncbrit is offline Hot Rolled
    Join Date
    Apr 2011
    Location
    California
    Posts
    518

    Default

    My 40 tool SV-20 MAZAK tool changer is stuck at 1/2 position, GE2000 control.

    I got the chain to move manually, but it decelerates to a position between tool pockets and try's to engage the lock piston.

    I tried removing the power and turning the motor to get the pocket lined up but it went back to 1/2 way as soon as I moved it with the push button control.

    It has a timing belt to an encoder, must be keeping an eye on what I am doing.

    there is a M/T 0 deg switch in the control, and I believe the Mazak MPS 510 is running the show.

    DO I need to remove the timing belt on the encoder, or take the battery out of the MPS board, before I realign this thing?

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