I1 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 DC-DC converter or associated components providing power to the U-phase gate driver circuit on Port 1.
• Short circuit on the U-phase gate driver output, drawing excessive current and causing the local power supply to trip or fail.
• Internal fault within the U-phase IGBT module itself on Port 1, creating an overload on its gate drive power supply.
• Degradation or failure of electrolytic capacitors on the U-phase gate driver board's power supply circuit.
• Poor connection or damaged ribbon cable between the main control board and the U-phase gate driver board (Port 1), disrupting power delivery or communication.

Klikk på steg for å spore fremgangen.

1. 1

   1. Power down the drive and measure the DC voltage output of the U-phase gate driver board's internal power supply (typically 15VDC to 24VDC) at its designated test points.

2. 2

   2. Visually inspect the U-phase gate driver board (Port 1) for swollen capacitors, burnt components, discolored resistors, or signs of arcing.

3. 3

   3. Using an oscilloscope, observe the gate-emitter voltage waveform (Vge) for the U-phase IGBTs on Port 1 during a controlled test run (if possible) to detect anomalies.

4. 4

   4. Measure the resistance between the gate and emitter terminals of the U-phase IGBTs (drive powered off, DC bus discharged) to check for internal shorts within the IGBT module.

5. 5

   5. Verify the integrity and secure connection of any optical fiber or ribbon cable linking the main controller to the U-phase gate driver board (Port 1).