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IndustryArena Forum > Machine Controllers Software and Solutions > Fanuc > Alarm 12 Over current Power Circuit
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  1. #1
    Member
    Join Date
    Sep 2019
    Posts
    21

    Alarm 12 Over current Power Circuit

    Hello,
    I have alarm SP9012 (S1)SSPA: 12 OVERCURRENT POWER CIRCUIT from Spindle Amplifier aiSP15 A06B-6141-H015#H580.
    I checked:
    -power cable from Spindle Amplifier to Spindle Servo Motor and it is good.
    -I measured insulation resistance with Megohm meter from spindle servo motor and it is ok .
    On Spindle Amplifier aiSP15 A06B-6141-H015#H580 I have alarm 12.
    After Spindle amplifier I have a star delta circuit and I measured cabels and relays and they are good.
    I opened the Spindle Amplifier but I dind't find electrical diagram for:
    -IGBT A50L-0001-0374 6MBP160RUA060F-01
    -OKAYA PC63D630-225K

    OKAYA PC63D630-225K:
    I measured capacitance from pin1 to 2 = 2.07 uF
    pin 2 to 3 = 0
    pin 1 to 3= 0
    I didn't find electrical drawing.
    If someone has changed one of this maybe can help me. (Please check the picture)

    IGBT A50L-0001-0374 6MBP160RUA060F-01:
    I measured:
    From P to W,U,V-0.42V
    From N to W,U,V-0.42V
    From P to B- 0V
    From B to N- 0V
    If someone has changed one of this maybe can help me. (Please check the picture)
    I didn't find electrical drawing

    Some advice will be appreciated for what to change.

  2. #2

    Join Date
    Jun 2021
    Posts
    20

    Re: Alarm 12 Over current Power Circuit

    You checked the motor power cables and motor separately for insulation? What were the values? Did you check the phase-to-phase resistance of the motor? It should be basically 0, like 0.3ohms.

    Also check each phase to ground. You shouldn’t get a reading, but if you do, then your motor is shorted to ground and is shot.

    I’m assuming you haven’t changed any spindle motor related parameters, correct?

    I highly doubt you’re going to find the wiring schematic for the spindle drive unit online. If you’ve ruled out the motor being the problem then an AL-12 is almost certainly indicative of the spindle drive unit having some sort of internal fault.

  3. #3
    Member
    Join Date
    Sep 2019
    Posts
    21

    Re: Alarm 12 Over current Power Circuit

    Hi,
    Motor power cable-ok
    motor insulation-ok
    phase-to-phase resistance of the motor-ok
    I didn't change any parameters.

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