Missing Phase by Output

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This error indicates that one or more output phases to the motor are either missing entirely or exhibit a significant imbalance, suggesting an issue with the drive's output stage or the motor connection wiring.

• Open circuit in one of the motor phases (e.g., broken motor cable, loose terminal connection).
• Internal failure of an output IGBT or a complete phase leg within the drive.
• Poor or intermittent connection between the drive output terminals and the motor terminals.

Klikk på steg for å spore fremgangen.

1. 1

   Disconnect the motor and measure the resistance between each pair of output phase terminals (U-V, V-W, U-W) on the drive; expect balanced readings.

2. 2

   Check all motor cable connections for looseness, damage, or corrosion at both the drive output and motor input ends.

3. 3

   Measure the insulation resistance of the motor windings to ground and phase-to-phase using a megger to detect potential shorts or open circuits.

4. 4

   If safely accessible, verify the output switching of each phase from the drive using an oscilloscope or appropriate measurement tool.