Velocity Loop Error

What does F878 mean?

The velocity control loop of the ECODRIVE DKC01.1/DKC11.1 drive has detected an error, indicating a significant deviation between the commanded velocity and the actual motor velocity. This can result in instability or inability to maintain speed.

• Incorrect tuning of the velocity loop parameters (e.g., P and I gains) for the motor and load.
• Problems with the motor encoder feedback signal, such as noise, intermittency, or loss of signal.
• Mechanical issues such as excessive load, friction, binding, or a decoupled load.
• Insufficient motor torque or current limit to achieve the commanded velocity or acceleration.
• Faulty motor or motor cabling.

Click steps to track your progress.

1. 1

   Inspect the motor encoder and its cabling for proper connection, shielding, and signs of damage.

2. 2

   Verify the integrity of the encoder signal using an oscilloscope if available.

3. 3

   Review and retune the velocity loop parameters (P-gain, I-gain) in the ECODRIVE DKC01.1/DKC11.1 controller, referencing the motor and application data.

4. 4

   Check for mechanical problems in the driven system, such as binding, excessive backlash, or a loose coupling.

5. 5

   Verify the motor parameters configured in the drive match the motor nameplate data.