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Brake release Fanuc

  • Electrico Tablerista
  • May 28, 2025 at 6:48 PM
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  • Electrico Tablerista
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    • May 28, 2025 at 6:48 PM
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    hi everyone, i've got a Fanuc Robot M-900iB 700kg.

    I need to release brakes of Fanuc robot. I've looked the way to do this, and i found a Fanuc Box brake release, but i cant get one in my country, so i start to trying by myself.
    Robot Axis 1,2,3 has the follow Motor's type: αi S 40/4000
    Robot axis 4,5,6 has the follow Motor's type: αi F 22/3000-b
    the brake uses 24vDC or 90vdc?

    Any help?

  • Lemster68 May 28, 2025 at 6:57 PM

    Approved the thread.
  • jstolaruk
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    • June 2, 2025 at 3:04 AM
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    90V DC. Big heavy robot, be careful.

  • Electrico Tablerista
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    • June 2, 2025 at 10:48 PM
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    Quote from jstolaruk

    90V DC. Big heavy robot, be careful.

    I tried with 90VDC but its really hard to move each axis when is "released" .It looks like abnormal release. I'm confused because on the αi S 40/4000 manual says that it uses 24vdc. Maybe the robot its very heavy and its really hard to move by this?:thinking_face::thinking_face:

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    Skooter
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    • June 3, 2025 at 11:39 PM
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    The aiS 40/4000 represents series, size & speed. A06B-0272-B605#S000 is the likely part # found on the motor tag. The motors on the robot all have 90V brakes. The manual you are using may not have the specifications for robot specific motors.

    What voltage are you using? Is the power supply providing enough current? You should hear a "clack" and feel when the motor brake opens.

    At the motor brake connector, make sure (+) is on pin A & (-) is on pin B.

  • Electrico Tablerista
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    • June 4, 2025 at 4:43 AM
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    • #5
    Quote from Skooter

    The aiS 40/4000 represents series, size & speed. A06B-0272-B605#S000 is the likely part # found on the motor tag. The motors on the robot all have 90V brakes. The manual you are using may not have the specifications for robot specific motors.

    What voltage are you using? Is the power supply providing enough current? You should hear a "clack" and feel when the motor brake opens.

    At the motor brake connector, make sure (+) is on pin A & (-) is on pin B.

    I tried with both options: 24vdc and 90vdc. But i didnt hear that "clack", i measured the current and it was around 0,6A at 90vdc on axis 5, but it was really hard to move,i assumed something is wrong.
    Then i found this manual and it confused me :upside_down_face:. (see attachment)

    Files

    Brake specifications.pdf 237.38 kB – 29 Downloads

    Edited 2 times, last by Electrico Tablerista (June 4, 2025 at 4:48 AM).

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    Skooter
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    • June 5, 2025 at 1:53 AM
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    Again, the aiS 40/4000 is the series but not the specification for that motor. If you search the specification numbers in your manual, you will see no match for the number on the motor. That manual is for non-robotic motors. Robot motors are usually different in shafts, brakes & encoders. Robot motors are 90VDC.

    Try axis J1 motor brake (or J4 if safe) and see if you have a difference.

  • svr
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    • June 5, 2025 at 2:57 PM
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    Maybe it's stupid, but it occurred to me... wouldn't it be necessary to unlock the M6 or M4 motor at the same time? I don't know how it is on the M-900, but on the M10, 2 motors rotate simultaneously even if I only rotate the J5 axis due to kinematics and gears.

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    Skooter
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    • June 5, 2025 at 9:56 PM
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    Quote from svr

    Maybe it's stupid, but it occurred to me... wouldn't it be necessary to unlock the M6 or M4 motor at the same time? I don't know how it is on the M-900, but on the M10, 2 motors rotate simultaneously even if I only rotate the J5 axis due to kinematics and gears.

    That is a good catch. Regarding J5 - releasing the brake on J5 and moving J5 will also move J6 and does cause extra mechanical resistance. Releasing J5 & J6 brakes will allow motor M6 to also turn and sometimes decreases the resistance. As jstolaruk mentioned, it a big heavy robot and has more inertia to overcome to move by hand.

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