Motors and Drives: Variable Frequency Drive (VFD)--Common Advanced Features

Part 7 of the Variable Frequency Drives Series explains more common advanced features often found on variable frequency drives, including: stall prevention, slip compensation, and dc injection.

Stall Prevention

Slip Compensation/ Boost–Output frequency increases above setpoint automatically to drive the load closer to the original speed

Auto Torque Boost – will increase current during starting automatically until the load is moving

DC Injection – sometimes holding torque is required for short periods of time during starting and stopping: releasing a mechanical brake is a common use.

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