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10 Drive Optimization
10.5 Measuring function for coupled axes
Measuring
parameters in the
speed control loop
Example of a pure
master–slave
coupling
!
10-192
In the reference frequency response for the speed control loop, actual and set-
point speed values may be entered as the following measuring parameters for
both interconnected gantry/axes and master/slave couplings.
Amplitude of leading axis
This parameter determines the magnitude of the test signal amplitude for the
gantry leading or guiding axis or master axis in mm/min. On the motor side, this
should cause a slow speed of just a few (approx. 1 to 2) rpm.
Amplitude of synchronizing axis(es)
Edited measured variables for the amplitude of the gantry synchronizing
axis(es) or slave axis(es) in mm/min.
Bandwidth
Analyzed frequency range
4.0 kHz for 840D (scanning frequency 8.0 kHz).
Averaging
This value increases both the accuracy of the measurement and the measuring
duration. A value of 20 is normally suitable.
Settling time
Recording of the measured data starts after a delay equal to the value set here
after activation of the test setpoint. A value of between 0.2 and 1 s is recom-
mended.
Offset
The offset is started up via an acceleration ramp.
The acceleration value is defined for an
Axis:
MD 32300: MAX_AX_ACCEL
Spindle:
MD 35200: GEAR_STEP_SPEEDCTRL_ACCEL
MD 35210: GEAR_STEP_POSCTRL_ACCEL
Where:
Acceleration value = 0, no ramp
Acceleration value > 0, ramp active
The actual measuring function is not activated until the offset value is reached.
Speed control loop: All the axes are on a 1-axis module.
Axis X1
(1) Master axis
Axis Z1
(3) Slave axis
Axis A1
(4) Slave axis
Axis
(7) Slave axis
In a pure coupling mode, the displayed texts change if a different coupling mode
was previously active. The structure of the entire user interface does not
change. An axis is displayed as a master axis and all the other axes are then
the slave axes.
Important
Only the coupling axes for the selected axis are displayed.
If there are two axes on a double-axis module, neither the gantry nor the
master/slave are displayed in a pure coupling mode.
It should be noted that only one measuring function can ever be started per
module.
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
or master axis
or slave axis(es)
© Siemens AG 2006 All Rights Reserved
03/2006
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