February 2012 21 – 359
8 Using the servo lag display, adjust the tachometer at the servo amplifier as follows:
8 Run the adjustment for all axes.
8 Reset the machine parameter MP7290.x to its original value.
Comparison of
nominal and
actual speed
in the integrated
oscilloscope
Operation with ... Displayed servo lag
Velocity feedforward control Ideally 0
Servo lag According to the following formula:
LAG [mm] =
Traversing speed
kv factor
m
mm
Read the traverse speed from the display.
The kv factor for the lag mode is defined in MP1810.x.
A multiplication factor for the kv factor may be active for the displayed traverse speed (MP1820.x).
For this purpose a characteristic curve kink point is defined in MP1830.x. If necessary, contact the
machine tool builder!
Here, it might be helpful to use the integrated oscilloscope. The signals V (nom rpm) and
V (act rpm) can be recorded and compared. Thus, the quality of the speed adjustment can
be controlled and improved, if required.
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