July 2010 20 – 353
8 Adjust tachometer generator at the servo amplifier using the servo lag display as follows:
8 Repeat the adjustment for all axes.
8 Reset machine parameter MP 7290.x to its original value.
Comparison of
noml. and actl.
speed in the
integrated
oscilloscope
Operation with ... Servo-lag displayed
Velocity with feedforward control Ideally 0
Following error According to the following formula:
Read the traverse speed from the display.
The kv factor for the lag mode is defined in MP 1810.x.
It is possible that a multiplication factor for the kv factor is active for the displayed traverse
speed (MP 1820.x). A characteristic curve kink point is entered in MP 1830.x. Contact the
machine manufacturer!
It might be helpful to use the integrated oscilloscope. The signals V (nom rpm) and V (act
rpm) can be recorded and compared. The quality of the speed adjustment can thus be
controlled and improved, if required.
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