Motor phase failure phase U

What does 65290 mean?

A failure specifically of motor phase U has been detected. This indicates an open circuit in the wiring for phase U between the inverter and the motor, or an issue within the motor's U-phase winding. The error can only be reset after a 2-second blocking time.

• Broken conductor in motor cable phase U between the inverter output (U) and motor terminal (U1).
• Loose electrical connection at inverter output terminal U or motor terminal U1.
• Internal open circuit in the motor's U-phase winding.
• Failure of the inverter's internal power switching device (IGBT) responsible for phase U output.

Click steps to track your progress.

1. 1

   De-energize the drive and lock out power at the main disconnect.

2. 2

   Disconnect the motor cable from the inverter's U, V, W output terminals.

3. 3

   Measure the resistance between inverter output terminals U and V, and U and W using a multimeter; expect infinite resistance (open circuit).

4. 4

   Measure the resistance of the motor's U-phase winding by disconnecting the motor cable from the motor and measuring between motor terminals U1-V1, U1-W1, and V1-W1; verify balanced, low resistance readings.

5. 5

   Check for continuity of the motor cable conductor for phase U using a multimeter, measuring between the inverter-side U conductor and the motor-side U1 conductor.