Siemens SINUMERIK 840D sl Function Manual page 423

Adaptation of the decay time
In special cases, it is possible to adapt the decay time of the compensation setpoint pulse in
addition to the compensation amplitude.
If, for example, the circularity test reveals that in the low acceleration range (a
transitions yield good compensation results but that radius deviations occur again
immediately after this, it is possible to achieve an improvement by adapting the decay time.
The time constant without adaptation ($AA_QEC_TIME_1) is only valid in the mid
acceleration range (50%).
The adaptation of the decay time for the compensation setpoint impulse according to the
characteristic shown in the diagram below is parameterized with system variable
$AA_QEC_TIME_2 (for acceleration = 0). The adaptation is formed by these two points
according to an e
The adaptation is performed under the following condition: $AA_QEC_TIME_2 >
$AA_QEC_TIME_1
Figure 5-33
Alteration of error measuring time
During the learning phase for the neural network, the error measuring time determines the
time window within which contour errors are monitored after a zero-speed passage.
Experience has shown that the error measuring time to be used for average acceleration
rates (approx. 2 to 50 mm/s
($AA_QEC_MEAS_TIME_2 = 3 * $AA_QEC_ TIME_1).
In the very low and high acceleration ranges, the error measuring time must be adapted.
This is done automatically according to the characteristic in the diagram below. The error
measuring time for small accelerations is set to six times the value of the decay time
($AA_QEC_MEAS_TIME_1 = 6 * $AA_QEC_ TIME_1); double the decay time
($AA_QEC_MEAS_TIME_3 = 2 * $AA_QEC_ TIME_1) is taken as the error measuring time
for larger accelerations.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
function (see diagram below).
-x
Adaptation of the decay time
) corresponds to three times the value of the decay time
2
Compensations (K3)
5.7 Neural quadrant error compensation
) the quadrant
1
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