Siemens SINUMERIK 840Di Manual page 335

06.03
Checking the
acceleration
Machine data
Table 10-34 Position control: Machine data
Number
Axis-specific ($MA_ ...)
32100 AX_MOTION_DIR[n]
32110
ENC_FEEDBACK_POL
32200 POSCTRL_GAIN[n]
32300 MAX_AX_ACCEL[n]
32900 DYN_MATCH_ENABLE[n]
32910 DYN_MATCH_TIME[n]
References
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
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.
Note
With SIMODRIVE 611 universal drives, the current actual value and the current
setpoint can be recorded using the SimoCom U start-up tool (trace function).
For further information, please refer to the online help of SimoCom U.
This recording shows whether the drive reaches the current limit. During this,
the current limit can be reached for a short time.
However, the current must be well below the current limit before the rapid tra-
verse velocity or the final position is reached.
Slight 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 maxi-
mum acceleration value.
Machine axes can have different acceleration values, even if they interpolate
with each other.
Identifier
Traversing direction
[n] Sign of actual value
Servo gain
Axis acceleration
Dynamic adaptation
Time constant of dynamic adaptation
/FB/ Description of Functions, Basic Machine,
G2 Velocities, Setpoint/Actual-Value Systems, Closed-Loop Control,
Section: Closed loop control
10 NC Start-Up with HMI Advanced
10.5 Axes and spindles
Name/remarks Ref.
10-335