Mechanical Weakening Detection 1

What does oL5 mean?

This fault occurs when the drive detects an overtorque condition that meets the criteria for mechanical weakening, as defined by the L6-08 [Mechanical Fatigue Detect Select] parameter. This suggests a potential deterioration or fatigue in the mechanical components of the system. Failure to address this can result in unexpected mechanical breakdown.

• Developing mechanical issue (e.g., worn gears, damaged belts, failing bearings) causing intermittent overtorque spikes.
• Improper setting of parameter L6-08 (Mechanical Fatigue Detect Select) or associated thresholds.
• Inconsistent load profile (e.g., fluctuating material feed, varying viscosity) causing repeated stress events.
• Motor insulation degradation leading to intermittent short circuits or ground faults under load.
• Drive control parameters (e.g., P2-01 [Motor Rated Current], L1-01 [Motor Overload Selection]) are not optimally tuned.

Click steps to track your progress.

1. 1

   1. Review historical trend data for output current (U1-04) and torque (U1-07) to identify intermittent load spikes.

2. 2

   2. Adjust parameter L6-08 (Mechanical Fatigue Detect Select) and its associated level/time parameters (e.g., L6-09) to suit the application.

3. 3

   3. Inspect and service all mechanical components of the driven system (e.g., gearboxes, belts, chain drives, bearings).

4. 4

   4. Perform a motor insulation resistance test (megohmmeter) to ensure winding integrity.

5. 5

   5. Consider reducing the load or increasing the motor/drive sizing if the mechanical system is operating at its limits.

6. 6

   6. Check for loose motor mounting bolts or foundation issues that could contribute to mechanical stress.