DC Bus Limit

What does 3211 mean?

The drive is limiting torque due to an intermediate circuit DC voltage that is either too high or too low. This is an informative alarm (programmable Fault Function 30.23, bit 1: DC_VOLT_LIM_IND) indicating the drive is actively compensating to protect internal components from over or undervoltage conditions.

• DC bus voltage exceeding the maximum allowable limit.
• Overly aggressive deceleration ramp causing regenerative braking energy overload.
• External braking resistor failure or undersized for the application.
• Control parameters (e.g., P2-20) set too high for the system's regenerative capacity.

Click steps to track your progress.

1. 1

   Check Fault Function parameter 30.23 (LIMIT WARNING) to ensure it is correctly configured for DC bus voltage supervision.