49

Speed limit exceeded

Danfoss · VLT HVAC Drive High Power

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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Check for mechanical issues on the motor or load that could cause speed deviations.

  2. 4

    Adjust parameter 1-86 (Trip Speed Low [RPM]) if the low speed trip is unwanted for certain operating states.

Source: Danfoss VLT HVAC Drive High Power
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