Overvoltage During Deceleration

What does -ObF mean?

This fault occurs when the motor generates excessive regenerative energy back into the drive controller's DC bus during rapid deceleration or when driving an overhauling load (e.g., lowering a weight). This rapid increase in DC bus voltage can exceed safe limits and damage the drive's internal components if not dissipated properly.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Consider activating the 'brA' (Braking Control) function in the drive's parameters if supported and compatible with the application, as described on page 63, to optimize regenerative energy handling.