Lenze 931W - Manual (Page 42)

Software implementation and parameter setting
Controller menu
Following error window
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42 HB 13.0001-EN 3.0
5.5.9 Following error window
In following error controlled systems, a higher-level following error controller is
superimposed on the speed controller, by means of which the following errors that are
caused by deviations between the actual speed value and the speed setpoint are
compensated. A possible case of operation for this could for instance be a belt conveyor,
on which several drives have to follow one setpoint in a synchronous manner without
producing a deviation that is too high.
In the following error window, the maximum permissible deviation of the following error
canbe defined inincrements. If this value is exceeded,the warningsignal ”Followingerror”
is output (see ”Status” tab). The entry ”0” corresponds to the lowest following error, which,
however, in practice due to the limited accuracy of measurement cannot be achieved. The
maximum value is defined at 30000 increments.
5.5.10 Position control end time
The position control end time specifies the time for which the controller remains active
after completion of a travel data set. In this time, the maximum holding torque is placed
on the motor shaft, serving to set and hold the exact set position. For entering the value
”0”, position control is effected for an infinitely long time.