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IndustryArena Forum > Machine Controllers Software and Solutions > Fanuc > FANUC OT B Spindle rpm fluctuating and causing 1008 Spindle Drive Fault
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  1. #1
    Join Date
    Apr 2005
    Posts
    79

    FANUC OT B Spindle rpm fluctuating and causing 1008 Spindle Drive Fault

    Hi,

    I checked all the fuses, and they are ok. After analyzing the AC spindle drive faults, I have one bulb lit in the number two spot. The text for this says "Speed deviates from commanded speed". I read the list of alarms page, and the causes include Overload, transistor module is damaged, loose connections, error with speed feedback signal and blown fuse.

    A friend of mine who used to work with GE controllers thinks the frequency and voltage from the drive needs to be adjusted, using the pots on the board. I don't have that manual, so I wanted to ask what the hertz and frequency need to be, so I can adjust that using the pots on the board.
    My input voltage checks at 430V 3-phase, and the out voltage from the transformer is 215V 3-phase, which I didn't worry about because it is within 10 percent.
    Also, is there a good way to check the transistor module? Any suggestions are appreciated.

    Thanks,
    Bill Gillen

  2. #2
    Join Date
    Sep 2010
    Posts
    125
    first , give us the type of spindle drive (A06B-6***-H*** ) or the pcb type (A20B-****-****) or (A16B-****-****)

  3. #3
    Join Date
    Apr 2005
    Posts
    79
    Hi,

    I checked the board, and here is what I saw.

    AC SPINDLE SERVO UNIT
    Type No. A06B-6052-H001
    Mfg. No. P7Y000595


    On the boards,
    (the one in back) A16B-1100-009?/09D
    (the one in front) A16B-1100-0080, Edition 08D

    Any information on the spindle drive unit is appreciated.

    Thanks again,
    Bill Gillen

  4. #4
    Join Date
    Sep 2010
    Posts
    125
    ok, first thing, you have to check sensor signal by an oscilloscope turning spindle by hand . you have check points at the bottom of the pcb, just near CN2 connector .they are called Pa,Pb, Ra, Rb. You must found a sinusoid of about 3.5 volts on the a, and continuous 3 volts on the two others.

  5. #5
    Join Date
    Apr 2005
    Posts
    79
    Hi,

    My alarms sheet, item 2 under "Speed is deviated from the command value" suggests the Transistor module is defective. The Check Procedure says Transistor collector-emitter is open, and the Remedy is Replace Transistor module.

    Is there a simple way to test this transistor module? Or is it one of those situations where you "guess, spend the money and go to the next problem"?

    I found this transistor module, and wanted to ask; Is this the module they are talking about?

    A50L-0001-0209 Fanuc Transistor Module: Darlington.


    Also, if it is, I think I know where it goes, but wanted to ask. I think it goes behind the double stacked circuit board near the center of the cabinet. Is that correct?

    Thank you again,
    Bill Gillen

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