Brake transistor alarm detection

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This brake transistor alarm detects an issue caused by large regenerative energy from the motor, tripping the inverter. This fault signals potential overheating or overstress of the brake transistor circuit. Immediate power-off is critical to prevent component damage.

• Excessive regenerative energy generated by the motor during rapid deceleration or overhauling load conditions.
• Braking resistor's resistance value (Pr. 30) is too high or its power rating is insufficient for the application.
• Brake transistor (internal or external) overheating due to continuous or high-frequency braking operations.
• Faulty brake transistor (IGBT) internal to the inverter, causing an imbalance or short circuit.
• Loose connection or high resistance in the wiring between the inverter and the external braking resistor.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Measure the resistance of the external braking resistor (if installed) and compare it against the value set in Parameter Pr. 30.

2. 2

   Inspect the braking resistor for physical damage, signs of overheating, or disconnected wires.

3. 3

   Increase the deceleration time (Pr. 8) to reduce the rate of regenerative energy feedback to the inverter.

4. 4

   Verify that the braking resistor's power dissipation rating (watts) is sufficient for the application's duty cycle.

5. 5

   Confirm proper cooling airflow for both the inverter and any external braking resistor.

6. 6

   Measure the voltage across the braking resistor terminals during deceleration to confirm energy dissipation.