Drive Runaway A2

What does 21 mean?

This "Drive Runaway Axis 2" error indicates a conflict between the direction of the Axis 2 encoder feedback and the commanded polarity of Axis 2. This means the drive is trying to move in one direction, but the encoder reports movement in the opposite, or there's a misconfiguration in feedback/command polarity.

• Direction Axis 2 parameter (P46) is incompatible with the wiring polarity of the Axis 2 encoder or the E1/E2 command inputs.
• Encoder Data A2 parameter (P41) does not accurately reflect the encoder used on Axis 2, leading to incorrect interpretation of feedback.
• RPM/Volts in Drive Sensit. A2 parameter (P43) does not match the Axis 2 amplifier's command input (E1/E2) characteristics.
• Physical movement of Axis 2 (e.g., by external forces) without a corresponding command voltage, causing a discrepancy.
• Incorrect wiring polarity of the Axis 2 encoder or the E1/E2 command inputs to the amplifier.

Click steps to track your progress.

1. 1

   Verify that Parameter P46 (Direction Axis 2) is compatible with the wiring polarity of the Axis 2 encoder and the E1/E2 command inputs to the drive amplifier.

2. 2

   Confirm that Parameter P41 (Encoder Data A2) accurately matches the specifications of the absolute or incremental encoder installed on Axis 2.

3. 3

   Ensure Parameter P43 (Drive Sensit. A2) RPM/Volt setting corresponds to the actual RPM/Volt scaling of the Axis 2 amplifier's command input (E1/E2).

4. 4

   Inspect Axis 2 for any mechanical binding or external forces that could cause movement independent of electrical commands.

5. 5

   Check all wiring connections and polarities for the Axis 2 encoder and the E1/E2 command inputs to ensure they are correct and secure.