VFCPLUS

SEW-EURODRIVE recommends using the following settings and control behavior in lifting applications with the VFCPLUS control mode (without encoder):

Parameter settings for asynchronous motors:
  • For hoists, use the stop by setpoint function (FCB 05 - speed control). Functions > Drive functions > FCB 05 Speed control > Stop by setpoint function > Activation = "1" (Yes).
    • Set the parameter Functions > Drive functions > FCB 05 Speed control > Stop by setpoint function > Stop setpoint so that the resulting motor speed is ≥ 1.5 × nominal slip of the motor.
    • As an alternative, set the parameter Functions > Drive functions > FCB 05 Speed control > Minimum speed so that the resulting motor speed is ≥ 1.5 × nominal slip of the motor.
  • Set the parameter Drive train > Drive train ASx > Controller > Control mode > Flying start = "0" (Off).
  • Set the parameter Drive train > Drive train ASx > Controller > Control mode > Flux optimization = "0" (Off).
  • Set the parameter Drive train > Drive train ASx > Controller > Control mode > Braking operation = "4Q" (motor + generator mode).
  • Set the parameter Drive train > Optimization ASx > VFCplus > Boost = 10%.
Control behavior for asynchronous motors:
  • Design the control in such a way that a direction of rotation reversal is only possible in an idle state (with the brake applied).
  • If you want to change the direction of rotation without an idle state, use a drive with encoder.
  • Control the drive at a setpoint speed that corresponds to a speed ≥ 1.5 × nominal slip of the motor.
Parameter settings for synchronous reluctance motors:
  • Set the parameter Drive train > Drive train ASx > Controller > Control mode > Flying start = "0" (Off).
  • Set the parameter Drive train > Drive train ASx > Controller > Control mode > Flux optimization = "1" (Off).
  • Set the parameter Drive train > Drive train ASx > Controller > Control mode > Braking operation = "4Q" (motor + generator mode).
Control behavior for synchronous reluctance motors:
  • Design the control in such a way that a direction of rotation reversal is only possible in an idle state (with the brake applied).
  • If you want to change the direction of rotation without an idle state, use a drive with encoder.