Brake Resistor Power Limit

What does 26 mean?

The braking resistor has been dissipating energy continuously beyond its rated power limit. This indicates excessive or prolonged regenerative braking, potentially leading to resistor overheating and damage, or even fire hazards.

• Excessive or prolonged regenerative braking due to application demands (e.g., high inertia, rapid deceleration).
• Braking resistor's continuous power rating is insufficient for the application's duty cycle.
• Incorrect braking resistor nominal resistance (Parameter P2-21) set in the drive, leading to miscalculation of power.
• Ambient temperature exceeding the resistor's operational limits or insufficient airflow around the resistor.
• Incorrect deceleration ramp time (e.g., Parameter P3-41) causing high peak braking power.

Click steps to track your progress.

1. 1

   1. Verify that the nominal resistance value entered in Parameter P2-21 (Brake Resistor Resistance) exactly matches the physical braking resistor's specification.

2. 2

   2. Monitor the drive's diagnostic parameter for braking chopper utilization (e.g., P16-XX Brake Chopper Load) during typical operation to assess energy dissipation.

3. 3

   3. Evaluate the application's braking cycle frequency and duration against the installed braking resistor's continuous power rating.

4. 4

   4. Ensure adequate ventilation and check for obstructions (e.g., dust buildup) around the braking resistor's cooling fins.

5. 5

   5. Consider increasing the physical braking resistor's continuous power rating or installing multiple resistors in parallel if application demands exceed the current setup.

6. 6

   6. Adjust the deceleration ramp time (e.g., Parameter P3-41 Decel Ramp 1 Time) to reduce peak braking power if the application allows for longer deceleration.