CFC

The CFC control mode is a current-controlled control mode. The CFC control mode allows the operation of asynchronous and permanent-field synchronous motors with encoder with maximum torque dynamics.

The CFC control mode requires information about the rotor angle and the motor speed. For this reason, an encoder feedback (motor encoder) is always necessary.

For asynchronous motors, only the relative rotor angle is necessary. Thus, an incremental encoder is sufficient.

For synchronous motors, the CFC control mode requires an encoder system that delivers the absolute position within one motor revolution. In the case of encoder types that do not provide an absolute position withing one motor revolution, a commutation must be performed before every first enable after booting the system (FCB 18).

The advantage of the CFC control mode is the very high dynamics that can be achieved, as a control reserve for reaching the dynamic maximum torque is always available. For this reason, the CFC control mode is suitable for drives with highly dynamic motion control.