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  1. #1
    Join Date
    May 2008
    Posts
    4

    Mori Seiki SL3 spindle alarm

    Fanuc 5T Spindle problem

    I have a Mori Seiki SL3 lathe fitted with a Fanuc 5T control
    Today my ready light comes on but my spindle motor will not start and a PCB alarm SAI cones on in PCB A20B-0004-0990/03A. What is an FAI alarm?

    The fault appears to be -15V supply is less than 1Volt?

    My machine is fitted with a model 12 DC spindle motor (11kW).

    The spindle drive cabinet has the following PCB visible
    A20B-0004 -0990/03A
    A20B-0005-0610/05A

    There are no manuals for the spindle drive part of the machine.
    I measured the following voltages

    (a) Main fuses F4(212V), F5(212V), F6(212V)
    Same voltage top and bottom of the fuses.

    (b) Incoming supply R1(212V), S1(212V), T1(212V)
    (c) Incoming supply R0(440V), S0(444V), T0(440V)

    (d) Measured the following voltages on PCB A20B-0004-0990/03A.
    24V test point measures 30V
    15V test point measures 14.7V
    -15V test point measures 0V

    My question is where is the -15V voltage regulator?
    How do I adjust the 24V test point?

    The power unit for this machine is FANUC A14B-0046-B00V01.

    I am most grateful for any assistance.
    If available where can I purchase manual for my Fanuc model 12 spindle drive?

    Best regards Woofa

  2. #2
    Join Date
    May 2008
    Posts
    4
    Hi All
    I wish to report the machine is up and running.
    My Spindle Servo Unit is Model-12
    Fujitsu Fanuc
    SP-5/10
    A06B-6041-C002
    No SS10193
    The LHS PCB A20B-0004-0990 has a 15V regulator uA7815 all the regulators on this PCB measured OK and they do not appear to be the supplies for PCB A20B-0005-610.
    The PCB underneath is A20B-0005-0583 also has regulated supplies and supplies power to the top PCB via the ribbon connector cable.
    I replaced the faulty regulators UA7815 and UA7915 and all the voltages measured OK, no alarm.
    My Mori is up and running. A service/maintenance manual would have saved a lot of time.

    Best regards
    woofa

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