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Note
The values of MD40/MD41 can only be increased for step drives during op-
timization and then only to a limited extent when the frequency ramp
(MD45) is parameterized with the correct values in accordance with the op-
erating characteristic curve.
If the values are changed by an excessive amount, the error message "Fol-
lowing error too large" will be output. In this case, the values or the K
tor (MD38) must be reduced to provide an adequate margin!
Optimization for uniformity of movement
You can make optimization of the position controller considerably easier by
analyzing the actuating signal or drive speed (tachometer voltage) with a
storage oscillograph. The resulting oscillograms for the transition functions
U(t) and v(t), i.e. the oscillation pattern, can be interpreted more easily (see
Figure 7-16).
Fig. 7-16 Transition Function of the Position-Control Circuit
Optimization for overshoot
Evaluate the overshoot in the target position (s-overshoot in the servicing
data).
For suitable machine data changes, see Table 7-5.
Optimization for positioning time
Evaluate the approach time to the target position (approach time Te in the
servicing data).
For suitable machine data changes, see Table 7-5.
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
U
v
Effective range of jolt filter
Gain too high (axis swing damping weak)
Amplification/acceleration too great
Amplification/acceleration too small
Optimum setting
Starting up the FM 453
fac-
v
t
7-31
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