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In simple terms, the drive has detected an inconsistency or failure in its internal circuitry that measures electrical current flowing to the motor. The drive includes current sensors (usually Hall Effect sensors or shunt resistors) that monitor output to protect the motor and the drive itself. When the drive powers up (or during a self-check), it expects to see near-zero current with the motor stopped. If the measured offset is above a predefined threshold, the drive triggers an A910 alarm. yaskawa error code a910
When the A910 fault occurs, you will typically observe: When the drive powers up (or during a
✓ Check U, V, W connections ✓ Measure phase-to-phase resistance (should be balanced) ✓ Test motor directly on line power ✓ Inspect output contactor (if used) ✓ Disable detection ONLY for diagnosis If ignored, the drive will eventually trip to
This code signals that the motor is operating at a load or torque level that exceeds its continuous rating for a significant period. If ignored, the drive will eventually trip to protect the hardware. Yaskawa America Primary Causes and Solutions Mechanical Overload: