Dynamic Braking Transistor Fault

What does RR mean?

This fault indicates a failure of the dynamic braking transistor. Common causes include a shorted dynamic braking transistor, consistently high DC bus voltage, or a defective dynamic braking resistor. This condition can lead to uncontrolled energy dissipation or damage to the drive's power stage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Monitor the DC bus voltage to identify and resolve potential overvoltage conditions that could stress the transistor.