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Stud ent Gu ide HS-5 0 Adva nced II 07/2 002 Ed ition 9 Z-Axis 43 – Use th e SITEST progra m to ch eck the tach o sig nal curve once m ore as d escrib ed.
07/2002 Edition Student Guide HS-50 Advanced II
9 Z-Axis
42
A tendency for the axis to vibrate is illustrated in Figure Fig. 9.6 - 13.
The oscilloscope settings are the same as in Fig. Fig. 9.6 - 12.
– Slowly increase the P gain by turning the potentiometer on the servo-amplifier board. With the
tacho signal, a dip or peak starts in the vicinity of the falling edge of the end signal
(see Fig. 9.6 - 13). The axis speed rises again shortly before the final position is reached. This
is an indicator that the axis has a tendency to vibrate. The axis no longer reaches its desired
position with the required repeat accuracy. The pick-up error rate rises.
– If the P gain is increased further, more dips and peaks occur (see Fig.7.6 - 6). The pick-up error
rate rises sharply. Finally, the axis vibrates to such an extent that a humming sound can be
heard.
Student Guide HS-50 Advanced II 07/2002 Edition
9 Z-Axis
43
– Use the SITEST program to check the tacho signal curve once more as described.
07/2002 Edition Student Guide HS-50 Advanced II
9 Z-Axis
44