Motor Step Out

What does E.SOT mean?

The inverter output is shut off when the motor loses synchronization during operation, a condition specifically monitored under PM sensorless vector control. This fault indicates a loss of control over the motor's rotor position, leading to erratic operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If restarting during coasting, set Pr.57 (Restart coasting time) to a value other than '9999' and enable automatic restart after instantaneous power failure.

2. 4

   Verify the physical connections of the IPM motor.

3. 5

   Perform offline auto tuning for the PM motor to correctly identify its characteristics.