Overvoltage Due to Deceleration

What does Overvolt D mean?

This fault occurs when the DC link voltage rises above a safe threshold during motor deceleration. This is typically caused by regenerative energy from the motor feeding back into the VSD faster than it can be dissipated, often in applications with high inertia loads or short deceleration times. Sustained overvoltage can damage the VSD's DC bus capacitors and IGBTs, risking drive failure.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the braking resistor and its associated wiring for proper connection, resistance value, and functionality.

2. 4

   Ensure the braking unit (if external) is correctly sized and enabled in the drive's parameters.