Brake Transistor Alarm Detection

What does E.BE mean?

This fault indicates that the brake transistor has detected an alarm condition, typically due to excessive regenerative energy from the motor. This usually happens during rapid deceleration or when driving high-inertia loads, leading to overheating of the braking components. Continuous overheating can damage the inverter's internal brake circuit and external brake resistor.

• Excessive regenerative energy flowing back to the inverter from the motor during rapid deceleration or with high inertia loads.
• Brake resistor resistance value (Pr. 30) is set incorrectly or the connected external brake resistor is undersized for the application's regenerative power.
• Brake resistor element (internal or external) has failed (open circuit or short circuit) or its thermal protection has tripped.
• Brake transistor (IGBT) itself has failed internally or its gate drive circuit is malfunctioning.
• Rapid deceleration times (Pr. 8) are set too short, generating high regenerative energy that overwhelms the braking circuit.

Click steps to track your progress.

1. 1

   Using an ohmmeter, measure the resistance of the external brake resistor connected between terminals P/+ and N/- (or P/+ and P/DB for internal brake resistors), comparing to the rated value.

2. 2

   Increase the deceleration time (Pr. 8) to reduce the rate of energy regeneration, ensuring it's not excessively short for the load inertia.

3. 3

   Verify the brake resistor parameter Pr. 30 (Brake resistor selection) matches the actual installed resistor type and size.

4. 4

   Check the duty cycle and peak power rating of the external brake resistor to ensure it can handle the application's regenerative energy.

5. 5

   If the brake resistor and deceleration settings are confirmed correct, inspect the inverter for signs of internal brake transistor damage or overheating.