Speed limit exceeded

What does 49 mean?

The motor's actual speed is outside the range defined by parameter 4-11 (Motor Speed Low Limit [RPM]) and parameter 4-13 (Motor Speed High Limit [RPM]). If the speed drops below parameter 1-86 (Trip Speed Low [RPM]) (excluding start/stop conditions), the frequency converter will trip, indicating a potential control issue or an abnormal operating condition.

• Actual motor speed exceeding parameter 4-13 Motor Speed High Limit [RPM] due to an incorrect speed reference or motor runaway.
• Actual motor speed dropping below parameter 4-11 Motor Speed Low Limit [RPM] (and potentially below P1-86 Trip Speed Low Limit [RPM]) due to mechanical overload or stall.
• Inaccurate speed feedback from encoder or tachometer (e.g., encoder cable noise, faulty sensor).
• Incorrect configuration of speed limits (P4-11, P4-13) or trip speed low limit (P1-86) for the application.
• Mechanical fault causing excessive friction or binding, leading to motor stall at low speeds.
• Motor parameters (e.g., P1-20, P1-22, P1-25) incorrectly configured, leading to poor speed regulation.

Click steps to track your progress.

1. 1

   Monitor the actual motor speed (e.g., LCP display P16-16 Actual Speed Filtered) and the speed reference (e.g., P16-15 Speed Reference) during operation.

2. 2

   Verify parameters 4-11 Motor Speed Low Limit [RPM] and 4-13 Motor Speed High Limit [RPM] are set appropriately for the application's operating range.

3. 3

   Check parameter 1-86 Trip Speed Low Limit [RPM] and ensure it is configured to prevent nuisance trips during normal low-speed operation.

4. 4

   If an encoder is used, inspect encoder wiring (e.g., terminals 32, 33, 35, 36) for noise or damage and verify encoder pulses (e.g., P16-30).

5. 5

   Check for any mechanical binding or excessive load on the motor that would cause it to stall or exceed its speed limits.

6. 6

   Perform an Automatic Motor Adaptation (AMA) via parameter 8-10 to ensure motor parameters (e.g., P1-20, P1-22) are correctly identified and configured.