10
03.96
10.5 Frequency response measurement
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Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
A jerking motion can be set with the axis-specific NC MD 32410
AX_JERK_TIME (when NC MD 32400 AX_JERK_ENABLE is set to 1).
The position setpoint and the actual value of the active measuring system are
recorded.
Speed
Amplitude
Offset
Settling time
Measurement time
t
t
0
0
Position
Ramp
time
Fig. 10-5 Signal waveform with position setpoint / ramp measuring function
At maximum axis velocity, there is a (virtual) step change in the velocity (contin-
uous line).
The curves represented by the dashed line correspond to a realistic, finite
value. The offset component is excluded from the display graphic in order to
emphasize the transient processes.
In order to avoid damage to the machine, the step height for the setpoint step
change is limited to the value specified in MD 32000 MAX_AX_VELO. This can
prevent the desired step height from being achieved.
The machine data MD 32000 MAX_AX_VELO and MD 32300 MAX_AX_AC-
CEL have the same effect in the ramp area.
The MD 32000 MAX_AX_VELO limits the ramp rate of rise (velocity limitation),
whereby the drive does not reach the programmed end position (amplitude).
The acceleration limitation caused by MD 32300 MAX_AX_ACCEL “rounds” the
transition at the beginning and end of the ramp.
!
Danger
Changes should not be made to the MD 32000 MAX_AX_VELO and MD
32300 MAX_AX_ACCEL machine data without being knowledgeable, for ex-
ample just to achieve a specific jump height. These MD have been set to ex-
actly correspond to the machine!
Step height
10 Drive Optimization with Start-Up Tool
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