Overheat / Low Temperature Detected Fault

¿Qué significa OHF ?

The soft starter has detected an internal temperature that is outside its safe operating range (either too high or too low). Overheating can damage the soft starter components, while extremely low temperatures might affect performance.

• Inadequate ventilation or blocked airflow around the soft starter heatsinks (e.g., clogged air filters, insufficient cabinet spacing).
• High ambient temperature in the control cabinet exceeding the soft starter's specified operating range (e.g., >50°C).
• Failure of the soft starter's internal cooling fan (if equipped) or fan motor winding failure.
• Soft starter heavily loaded (e.g., frequent starts, long run times at high current) causing internal components to generate excessive heat.
• Faulty internal temperature sensor providing incorrect readings to the control board.
• Extremely low ambient temperature (e.g., < -10°C) causing internal components to fall outside their operating range.

Haga clic en los pasos para seguir su progreso.

1. 1

   1. Measure the internal cabinet temperature using a thermometer and compare to the soft starter's specified operating range (e.g., -10°C to +50°C).

2. 2

   2. Inspect soft starter heatsinks for dust buildup and ensure cooling fan (if present) is operational and free of obstructions.

3. 3

   3. Verify adequate clearance around the soft starter for proper airflow according to installation manual specifications (e.g., 100mm top/bottom).

4. 4

   4. Check soft starter load profile (e.g., using P7-01 for run time and P7-02 for starts per hour) and reduce duty cycle if excessively high.

5. 5

   5. Monitor soft starter internal temperature via diagnostic parameter (e.g., F1-04) and compare to expected values.