Bleeder Overtemperature Warning

What does E252 mean?

The internal or external braking resistor (bleeder) has reached a high operating temperature, nearing its maximum permissible limit. This warning indicates that continuous operation under these conditions may lead to an F220 shutdown of the ECODRIVE DKC01.1/DKC11.1 drive.

• Excessive regenerative energy due to frequent or rapid decelerations, or heavy overhauling loads.
• Improperly sized or faulty external braking resistor.
• Inefficient cooling or poor ventilation for the braking resistor.
• Overloading of the drive's internal bleeder circuit.

Click steps to track your progress.

1. 1

   Verify the duty cycle and deceleration rates of the application; consider extending deceleration times or reducing frequency.

2. 2

   Inspect the external braking resistor for signs of overheating, proper connection, and verify its ohmic value.

3. 3

   Ensure adequate airflow and ventilation around the braking resistor and within the control cabinet.

4. 4

   Evaluate if the braking resistor is appropriately sized for the regenerative energy profile of the application.

5. 5

   Monitor the DC bus voltage during braking events and the temperature of the bleeder if possible.