I3 UBrd Fault

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The power supply on the U-phase gate driver board has failed. This affects the control of the U-phase output and can lead to motor malfunction or drive damage.

• Failure of the power conversion stage (e.g., isolated flyback converter) that provides bias power to the U-phase gate driver for Port 3.
• Short circuit on the control signals or power rails connected to the U-phase gate driver, causing the supply to fail or current limit.
• An internal short within the U-phase IGBT or power module on Port 3, leading to an immediate failure of its gate power supply.
• Insufficient voltage or excessive ripple on the primary DC bus supplying the U-phase gate driver board for Port 3.
• Physical damage or incorrect installation of the U-phase gate driver board (Port 3) itself, causing electrical stress or misconnection.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   1. With drive power off, measure the output voltage of the U-phase gate driver board's internal power supply (e.g., 18VDC) for Port 3 at its designated test pads.

2. 2

   2. Conduct a detailed visual examination of the U-phase gate driver board (Port 3) for any evidence of overheating, component damage, or lifted traces.

3. 3

   3. Use an ohmmeter to measure the resistance between the gate and emitter terminals of the U-phase IGBTs on Port 3 (drive powered off, DC bus discharged) to check for internal shorts or degradation.

4. 4

   4. Ensure all electrical connections to and from the U-phase gate driver board (Port 3), including ribbon cables and power leads, are securely attached and undamaged.

5. 5

   5. Verify the integrity of the DC bus voltage that supplies the gate driver boards, measuring it at the input terminals of the power stage with a multimeter.