10
03/2006
10.5 Measuring function for coupled axes
10-193
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
If a scan is carried out in the position control loop, only gantry axes are inclu-
ded. None of the master/slave axes involved have a PI service, so are not initia-
ted on the NC side.
!
Caution
If two measuring functions are detected on a module, the coupling is cleared
internally and only one 1 PI service is sent to the selected axis. Particular
caution is required since another axis may also be used internally.
Amplitude of leading axis
This parameter determines the magnitude of the test signal amplitude of the
gantry leading axis in mm. It should be as small as possible (e.g. 0.01 mm).
Amplitude of synchronizing axis(es)
Edited measured variables for the amplitude of the gantry synchronizing
axis(es) in mm/min.
Bandwidth
Setting for the analyzed frequency range (no more than half the position control-
ler scanning frequency). The lower this value, the finer the frequency resolution
and the longer the measurement time. The maximum value corresponds to half
the position controller sampling rate (e.g. 200 kHz with position controller sam-
pling time of 2.5 ms).
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 offset and test setpoint. A value of between 0.2 and 1 s is
recommended. Do not set too low a value for the settling times or the frequency
response and phase diagrams will be distorted.
Offset
The measurement requires a low speed offset of just a few motor revolutions
per minute. The offset must be chosen so that the speed does not pass through
zero at all at the set amplitude.
10.5.2 Mixed couplings of master/slave and gantry axes
As with pure interconnected gantry axes or master/slave couplings, only two
axes may be selected for scanning. If more than two axes are selected, a mes-
sage appears when the scan starts.
Gantry axis X1 is coupled to master axis A1. The gantry synchronizing axis Z1
is in turn coupled to a slave axis.
Axis X1 (1) Gantry leading axis (this is always a gantry axis)
Axis Z1 (3) Gantry synchronizing axis
Axis A1 (4) Master axis
Axis (7) Slave axis
Scanning in the
position control
loop
Example in the
speed control loop
10 Drive O
timization
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