
4.SERVO FUNCTION DETAILS B-65270EN/05
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(d) Usage
When the rising edge of the disturbance input bit (DSTIN) is detected,
application of vibration is started. Vibration is automatically stopped
after a sine sweep is performed from the start frequency to the end
frequency. The operation is stopped by a reset or an emergency stop.
After the emergency stop is released, disturbance input is resumed
starting with the start frequency by setting the function bit off then on
again.
[Example of setting]
No.2326 = 500 Æ Gain = 500
No.2327 = 0 Æ Start frequency = 10Hz
No.2328 = 0 Æ End frequency = 200Hz
No.2329 = 0 Æ Number of measurement points = 3
By using SERVO GUIDE, obtain data, and display the frequency
(ch1) and velocity feedback (ch2) in the XY-YT mode.
Velocity feedback
Input sine wave
frequency
Resonance
point
Gain characteristic
Frequency
As shown in the above waveform, the envelope of the velocity
feedback indicates the gain characteristic at each frequency, and a
swell portion in the waveform shows a resonance point.
Adjust the tandem disturbance elimination control parameters so that
the degree of the gain swell at the resonance point is reduced.
(7) Notes on Series 90B3 and 90B7
Series 90B3 and 90B7 are used for applications that require learning
control. It is assumed that the mechanical coupling between two
rotation axes, C1 and C2, is released. So, only when the two axes are
mechanically coupled with each other, tandem disturbance elimination
control functions. Whether the two axes are mechanically coupled
with each other can be checked using the input of the external signal
G139 (coupling flag). For details of the external signal interface, refer
to the description of "Tandem leaning control" in "Learning Function
Operator's Manual (A-63639E-034)".