Warning - Brake resistor overload

What does 65334 mean?

The calculated thermal load of the brake resistor has reached the warning threshold defined by parameter 0x2550:008 (P707.08), indicating excessive regenerative energy. The warning resets when the thermal load drops 20% below this threshold.

• Excessive or frequent regenerative braking events due to rapid deceleration of a high-inertia load.
• Brake resistor's power rating is insufficient for the application's regenerative energy dissipation requirements.
• Brake resistor's specified resistance value (P707.00) is incorrectly set in the drive, leading to miscalculation of thermal load.
• Poor ventilation or inadequate cooling around the brake resistor, causing actual temperature to exceed calculated limits.
• Loose or corroded connections to the brake resistor terminals (e.g., B1, B2) causing increased resistance and heat.

Click steps to track your progress.

1. 1

   Reduce the deceleration ramp times (e.g., P2-11) to decrease the rate of regenerative braking, thus lessening the energy dumped to the resistor.

2. 2

   Verify the brake resistor's power rating and resistance value are appropriate for the application and match P707.00. Consider installing a higher-rated resistor.

3. 3

   Check and improve ventilation around the brake resistor, ensuring sufficient airflow to dissipate heat.

4. 4

   Adjust the brake resistor thermal warning threshold (P707.08) if the current setting is overly conservative (after confirming resistor sizing).

5. 5

   Inspect connections to the brake resistor terminals (B1, B2) for looseness or corrosion, and retighten as needed.