IRB 4400 S4C+ M2000, unknown error 38456 - Strommessfehler Treiber

  • Hello there.



    Please, about err. 38456 does anybody know what does it mean?

    Thanks in advance. :confused_face:

    BR, Oldřich.


    38456 - Strommessfehler Treiber

    Reason: Interner Strommessfehler von Treiberstufe A3 in Steuerung 1 festgestellt.

    Actions: Perform a shutdown and then restartthe system.- If problem persists, replace thefaulty drive unit.

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  • I don't have error numbers memorized, can you post the text of the error?

    Hello Lemster.


    Thanks for you time.

    I've never see the error like this. Err. disappear after restart and robot is always running for a couple days.


    The description is:

    38456: Drive current measurement error

    Internal current measurement error detected by drive unit A3 in cabinet 1.

    Perform a shutdown and then restart the system. If problem persists replace the faulty drive unit.


    DU DSQC346G were mixed.

    I guess there would be something wrong with motor axis 3, but this motor is under warranty, motor was exchanged before 2 months.. Old motor axis 3 has short connection at brake.

    Maybe can be best to exchange whole robot for IRB4600... :smiling_face:

  • If I remember my S4C+ history (nowadays almost ancient history :face_with_tongue: ) A3 is not an axis designator, but position in the cabinet. I think C+ controls had nearly all multiple motors connected to the various drive units, 6400s 3 2 axis units, 1400s 2 3 axis units and a dummy box for air flow, maybe ???


    4400: Hint A3 drives axes 3 & 5

  • SomeTekk is correct, A3 is the physical location of the drive. A0 is the DC-Link on the left, but A3 is next to it. The 4 drive positions in the S4C from left to right are A0, A3, A2, A1.


    Start with the easiest - since all 3 drive units are the same in the 4400, swap drive unit in position A3 with position A2. If problem moves to A2, it's the drive.

    Next easiest - if you have another robot with the same robot-to-controller motor cable, try that. I remember 3 distinct times where it was this cable.

  • If I remember my S4C+ history (nowadays almost ancient history :face_with_tongue: ) A3 is not an axis designator, but position in the cabinet. I think C+ controls had nearly all multiple motors connected to the various drive units, 6400s 3 2 axis units, 1400s 2 3 axis units and a dummy box for air flow, maybe ???


    4400: Hint A3 drives axes 3 & 5


    If I remember my S4C+ history (nowadays almost ancient history :face_with_tongue: ) A3 is not an axis designator, but position in the cabinet. I think C+ controls had nearly all multiple motors connected to the various drive units, 6400s 3 2 axis units, 1400s 2 3 axis units and a dummy box for air flow, maybe ???


    4400: Hint A3 drives axes 3 & 5

    Hello. OK, Thank You. Positron of DU were exchanged to each other, so its's most probably can be caused by the "brand new" (refurbished) motor axis 3. :thumbs_up:

    Ad. S4C+ cabinets, these controllers sucking industrial dust from surrounding air trough every possible gaps between doors and chassis because the air filter is always stuck by dirt, and internal parts were full of sh1t. :winking_face:

  • SomeTekk is correct, A3 is the physical location of the drive. A0 is the DC-Link on the left, but A3 is next to it. The 4 drive positions in the S4C from left to right are A0, A3, A2, A1.


    Start with the easiest - since all 3 drive units are the same in the 4400, swap drive unit in position A3 with position A2. If problem moves to A2, it's the drive.

    Next easiest - if you have another robot with the same robot-to-controller motor cable, try that. I remember 3 distinct times where it was this cable.

    Hello Skooter. DU positions was exchanged before.

    OK, it's the very good advice with power cable. Thank You. If i remember nobody bet that the issue can by caused by the floor power cable. So, to exchange the floor cable its a easy step, there is no installation into workcell, only simple fence. :smiling_face: :thumbs_up: :thumbs_up: :thumbs_up:

    • Helpful

    Hello Skooter. DU positions was exchanged before.

    OK, it's the very good advice with power cable. Thank You. If i remember nobody bet that the issue can by caused by the floor power cable. So, to exchange the floor cable its a easy step, there is no installation into workcell, only simple fence. :smiling_face: :thumbs_up: :thumbs_up: :thumbs_up:

    Like Lemster68, I didn't catch the DU as drive unit at first.

    Of the bad controller-to-robot cables: 2 were damaged by being constantly walked on, the 3rd on was harder to find because it was new and the first 2 times I checked it, I used the 250V setting on the insulation tester - it showed up when I remembered motor voltage is closer to 400V and found the problem using the 500V setting of the tester.

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