NCK start-up
10.5 Parameterize axis data
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
135
• MD32300 MAX_AX_ACCEL (Axis acceleration)
This value should allow the axes to be accelerated and positioned fast and accurately, while
ensuring that the machine is not loaded unduly.
Default values
The default values of the acceleration are in the range from 0.5 m/s
2
to 2 m/s
2
Checking the acceleration
The sign of a properly adjusted acceleration of a machine axis is acceleration and
positioning free from overshoot at rapid traverse rate and maximum load (heavy workpiece).
After the acceleration has been entered, the axis is traversed rapidly and the actual current
values and current setpoint are recorded.
This recording shows whether the drive reaches the current limit. Here, the current limit can
be reached for a short time.
The current must be well below the current limit, however, before the rapid traverse velocity
or the final position is reached.
Load changes during machining must not cause the current limit to be reached. Excessive
current during machining causes falsification of the contour. For this reason, the acceleration
value should be a little bit less than the maximum acceleration value.
Machine axes can have different acceleration values, even if they interpolate with each
other.
Jerk
For jerk, the following should be noted:
• For indexing program instructions (SOFT), the maximum jerk must be set in the following
machine data:
– MD32431 MAX_AX_JERK (maximum jerk)
• For JOG and positioning axes the following machine data should be supplemented:
– MD 32420 JOG_AND_POS_JERK_ENABLE
– MD 32430 JOG_AND_POS_MAX_JERK
Machine data
Table 10-20 Position control: Machine data
Number Identifier Name / remarks Reference
axis spec. ($MA_ ... )
32100 AX_MOTION_DIR[n] Traversing direction
32110 ENC_FEEDBACK_POL[n] Actual value sign
32200 POSCTRL_GAIN [n] KV factor
32300 MAX_AX_ACCEL[n] Axis acceleration
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