Comparison of setpoint/actual speed values

  • Menu: 4.6.1-2

Description

Reference signal for monitoring whether the speed setpoint specified by the user was reached by the drive when the FCB 05 Speed control drive function was active.

The following parameters define when a reference signal is set or revoked:

  • Half window width – To prevent the reference signal from being continuously set and reset, a comparison window can be placed around the speed setpoint using the formula speed setpoint ± half window width. Within the comparison window, the speed setpoint is regarded as reached and a reference signal is set.
  • Delay time – The condition for setting the reference signal must be fulfilled for at least the duration of the delay time.
  • Signal – Setting at which the reference signal is set.

v0

Speed setpoint

v1

Lower limit of the comparison window (speed setpoint - half window width)

v2

Upper limit of the comparison window (speed setpoint + half window width)

Δt

Delay time

F1

Polarity: Value within window

F2

Polarity: Value out of window

Following is an explanation of how to set/reset the reference signal for the polarity Value within window (F1):

If the actual speed exceeds one of the limits of the comparison window, the delay time starts to elapse.

  • If the actual speed is within the comparison window for the duration of the delay time, the reference signal is set after the delay time has elapsed (time t1).
  • If the actual speed is outside the comparison window for the duration of the delay time, the reference signal is revoked after the delay time has elapsed (time t2).
  • If the actual speed passes the limit of the comparison window again before the delay time has elapsed, the reference signal is not changed (time t3).