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04AC0000 hex

Overcurrent

Omron · NJ/NX-series Machine Automation Controller

Hva betyr 04AC0000 hex ?

The current flowing through the converter exceeded the specified value. This fault indicates an excessive current draw, often caused by motor issues, wiring faults, or drive malfunction, posing a risk of component damage.

Vanlige årsaker

  • A short-circuit, line-to-ground fault, contact failure, or insulation failure occurred on the U, V, or W motor line.
  • The Servo Drive failed.
  • The relay for the dynamic brake has been welded due to frequent Servo ON/OFF operations.
  • Motor windings are burned out.
  • The Servomotor is not suitable for the Servo Drive.
  • The command input timing is the same as or earlier than the Servo ON timing.

Reparasjonssteg & Sjekkliste

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  1. 1

    Inspect all power wiring (input and output) to the drive and motor for loose connections, damage, or signs of overheating, paying close attention to the motor cable.

  2. 2

    Verify the mechanical load on the motor is not excessive or binding, ensuring the motor shaft can rotate freely without obstruction.

  3. 3

    Measure motor winding resistance phase-to-phase and insulation resistance to ground (using a megohmmeter) to detect potential motor winding shorts or insulation degradation.

  4. 4

    Check drive parameters for correct motor nameplate data, current limits, and acceleration/deceleration times against the machine's specified configuration.

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Verifisert teknisk data. Sist oppdatert: March 2026

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Kilde: Omron NJ/NX-series Machine Automation Controller