Lenze SX-1 - P21-P22 Performance Parameters

7.1.2
P21: Following Error Tolerance (E Lim
)
Units: %
Values: 12.5, 25, 50, 100, 200, 500
The Following Error is the difference between the required and actual position. The
Tolerance or Limit is the permitted deviation from the theoretical value as a percentage.
(Vmax) PS
100%= _________ — — •16.667
KV2• 16.667 P18
lt it is required that the control continue operation despite small torque variations such as
variable fnction, sudden loadchanges, etc, but atthetimeto reactto driving intoan obstac -
le, then inorease the Following Error ToleranCe. On the other hand, to achieve sensitive
response to changes in Following Error, reduce the tolerance.
The standard value is 12.5 % for normal servo drives.
In some cases a highervalue must be used, forexampleto allowforacceleration transients.
Following Error Display: In Manual and Automatic modes, the PT-1 displays the actual
position. Use the TEACH key to toggle the display of the Following Error, which is shown
in Distance Units.
P22: In-Position Window (Pos W), with Time-out
Supervision
Units: lncrements
Range ot Values: 1 to 30 000
Standard Value: 100
When the Required (calculated) position reaches its final value, the axis may some time
to reach, or may neverquite reach , the theoretical value, due to control limitations: instead
it is assumed to achieve an acceptable tolerance. The „Position Window“ defines the band
of positions which are accepted as sufficiently accurate. When this window is reached, the
commanded movement is assumed to be completed, and the next instruction is commen -
ced, even though final position may not yet quite be reached. This allows faster Operation
of the program.
7/16
Lanze