Prerequisites for the operation

Since the Velocity Observer estimates the axis acceleration from the current, it needs the value of the moment of inertia. This motor value is entered in parameter P-0-0071 or P-0-0127 (only for linear motors) when the motor is selected.

The value for the load must be added there:

If the correct value is unknown, it should be estimated. Common values for the moment of inertia ratio between load and motor are in the range 3 - 10.