Current control loop is not tuned

What does 4068 mean?

The current control loop, which is essential for stable motor operation, has not been tuned prior to attempting rotor parameter autotuning (applicable specifically to asynchronous motors). This prevents successful autotuning and proper motor control, potentially leading to unstable operation.

• Automatic current control loop tuning was skipped or failed (e.g., Autotune function P0-10=1 not completed successfully) before attempting rotor parameter identification.
• Incorrect motor nameplate data (e.g., P2-01 to P2-06) was entered, preventing the drive from establishing a stable current control model.
• The drive's internal current regulator parameters (e.g., P7-10 Kp_flux, P7-11 Ki_flux) are at default or unstable values.
• Motor wiring issues, such as an open phase or high resistance connection, prevent the current loop from closing effectively during initial tests.

Click steps to track your progress.

1. 1

   Initiate and complete the drive's built-in current loop autotuning sequence (e.g., via parameter P0-10=1).

2. 2

   Verify all motor nameplate data (rated current P2-01, rated voltage P2-02, rated frequency P2-03, rated speed P2-04, motor poles P2-05) against drive parameters.

3. 3

   Measure the resistance of each motor phase winding (U-V, V-W, W-U) at the motor terminals using a multimeter and compare values for balance.

4. 4

   Ensure no mechanical load is coupled to the motor shaft during current loop autotuning to prevent external disturbances.

5. 5

   Temporarily disable any encoder feedback (e.g., P5-01=0) if it might interfere with the initial current loop tuning process for asynchronous motors.