Mechanical Weakening Detection 1

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The drive detected overtorque conditions consistent with mechanical weakening or fatigue, as defined by the settings in L6-08 [Mechanical Fatigue Detect Select]. This fault indicates potential degradation of crucial machine components, such as bearings or gearboxes. If ignored, this could lead to catastrophic mechanical failure and significant downtime.

• Gradual increase in friction due to bearing wear in the motor, gearbox, or driven machine.
• Deterioration of mechanical components (e.g., worn gears, stretched belts, failing couplings) leading to increased load.
• Accumulation of debris or build-up within the driven process, causing slowly increasing resistance.
• Incorrect threshold setting for L6-08 (Mechanical Fatigue Detect Select) or associated parameters.
• Intermittent partial short circuit in motor windings that manifests under load/temperature.

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1. 1

   1. Review parameter L6-08 (Mechanical Fatigue Detect Select) and its associated settings for appropriate thresholds and monitoring periods.

2. 2

   2. Conduct a detailed inspection of the mechanical system, including bearings, gears, belts, and couplings, for signs of wear or damage.

3. 3

   3. Monitor the drive's output current (e.g., U1-06) over an extended period (trend data if available) to observe gradual increases.

4. 4

   4. Measure the operating temperature of the motor and gearbox with an IR thermometer to detect abnormal heat generation.

5. 5

   5. Perform vibration analysis on the motor and driven equipment to identify failing bearings or misalignments.

6. 6

   6. If adjustable, slightly increase the torque detection level or time parameters related to L6-08, but only after confirming no active mechanical issue.