Braking Resistor Overload Protection

What does E06. mean?

This error occurs when the usage rate of the regenerative braking circuit exceeds the configured limit (b090), indicating that the braking resistor is being overstressed. This usually happens during frequent or prolonged deceleration cycles, or if the braking resistor's capacity is insufficient for the application's regenerative energy requirements, risking component damage.

• Braking resistor usage rate (b090) exceeded due to frequent or prolonged deceleration cycles.
• Braking resistor power rating (Watts) is insufficient for the regenerative energy produced by the application.
• Braking resistor value is too high, reducing current flow and heat dissipation capability.
• External fan for the braking resistor has failed or its airflow is obstructed, leading to overheating.
• Incorrect parameter settings for the braking resistor (e.g., b091 resistor resistance, b092 resistor capacity) or its thermal protection.

Click steps to track your progress.

1. 1

   Monitor the braking resistor usage rate (d005) or regeneration power (d002) to understand the frequency and magnitude of braking events.

2. 2

   Verify the resistance value of the braking resistor (measured with an ohmmeter) matches the inverter's specified range and parameter b091.

3. 3

   Increase the deceleration time parameter (P1-05) to reduce the peak regenerative power and spread out energy dissipation.

4. 4

   Inspect the braking resistor for physical damage, discolored wiring, or signs of excessive heat (charring) and verify its power rating.

5. 5

   Review and adjust the braking resistor usage rate parameter (b090) if the resistor is adequately sized but the default setting is too conservative.