Asynchronous motors in control mode VFCPLUS

In VFCPLUS control mode without encoder , the entire speed range of the drive can be used dynamically.

However, continuous operation of asynchronous motors without encoder at low speeds is not possible. The minimum speeds that must not be permanently undercut during operation without encoder are:

  • Motoring operation: 1% of the asynchronous motor nominal speed
  • Regenerative operation: 10% of the asynchronous motor nominal speed

The described restrictions do not apply in the VFCPLUS control mode with encoder. In comparison to operation without encoder, higher dynamic properties can be achieved with an encoder. The maximum dynamics of the speed control loop are reached with a high-resolution encoder. The speed setting range depends heavily on the encoder system used.