Sveba-Dahlen oLC Error Code

What does Sveba-Dahlen oLC mean?

The SD-180's Schneider frequency converter has detected a process overload condition. This fault is triggered when the driven process demands more than the configured overload threshold for a sustained period, indicating the process itself—rather than purely the motor—is operating beyond its intended duty. The drive monitors output current over time against a programmed process overload curve and trips when the threshold is exceeded.

Symptoms

• Drive trips with oLC displayed on the touchscreen during sustained heavy-load operation
• Fault occurs after a period of high-demand running rather than immediately at startup
• Motor and drive may feel warm to the touch, consistent with sustained high current
• Process performance degrades (e.g., slower mixing speed or reduced throughput) before the trip occurs
• Fault clears after a rest period but returns under the same operating conditions

Common causes

• Process load sustained above the configured overload threshold for the defined time period (primary cause per manual)
• Process overload parameters (threshold current and time) set too sensitively for the actual application demands
• Mechanical resistance increase in the process (e.g., thickened dough, product buildup, or worn bearings adding drag)
• Motor running at a speed below its optimal efficiency range causing disproportionate current draw
• Process conditions have changed (e.g., recipe or batch size changes) increasing load beyond original commissioning assumptions

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Diagnostic steps

1. Review process overload parameter settings

   In the drive's configuration menus, locate the process overload (oLC) threshold and time settings. Verify these values are appropriate for the actual application and were set during commissioning to match the real process load profile.

2. Monitor output current during normal operation

   Use the drive's diagnostics display to monitor output current in real time during a normal production run. Compare measured current against the motor's rated current and the configured overload threshold to determine if the process genuinely exceeds limits.

3. Inspect the mechanical process for increased resistance

   Check the driven equipment for signs of increased mechanical resistance such as product buildup, worn or failed bearings, misalignment, or other obstructions. Address any mechanical issues found before adjusting drive parameters.

4. Evaluate process conditions and duty cycle

   Confirm with the operator whether process conditions have changed (batch size, product viscosity, or operating speed). If legitimate process changes have increased load, update the drive parameters to match the new duty requirements after engineering review.

5. Clear the fault and validate under monitored conditions

   After addressing mechanical issues or adjusting parameters, clear the oLC fault via the SD-180 touchscreen and run a full production cycle while monitoring current and temperature. Confirm the drive completes the cycle without tripping.

When to call a professional

Escalate to a licensed technician or Sveba-Dahlen-authorized engineer if the process overload fault persists after mechanical inspection and the current draw consistently exceeds the motor's rated value, as this may indicate a motor or drive sizing issue. Modifying process overload protection parameters beyond design intent without qualified review can mask genuine overload conditions and risk equipment damage.