Servotronix CDHD2S - Page 224

Tuning
—224
—
Figure 8-26 Anti-vibration filter
Stage 1: Detect disturbances sensed by the system using various control variables as inputs,
such as position error and current. The disturbed values are calculated for the next stage.
Stage 2: The disturbed values are passed through a narrowband bandpass filter, selecting
disturbances caused by system oscillations. The center frequency and width of the bandpass filter
are set by the parameters NLANTIVIBHZn and NLANTIVIBSHARPn respectively.
Stage 3: Calculate the correction output to be added to the control variable.
Stage 4: Add the correction output to the control variable using the damping gain (parameter
NLANTIVIBGAINn).
Anti-vibration tuning procedure
After autotuning, more anti-vibration tuning may be required.
If additional vibration frequencies need to be suppressed, the tuning process can be repeated
with a second set of anti-vibration filters. The following table shows the parameter values modified
by the tuning procedure.
Table 8-3
HD anti-vibration filter
Parameters
Default
Range
Center frequency 2
NLANTIVIBHZ2
100
5 to 800 [Hz]
Center frequency 3
NLANTIVIBHZ3
400
5 to 800 [Hz]
Sharpness 2
NLANTIVIBSHARP2
0.5
0.01 to 10
Sharpness 3
NLANTIVIBSHARP3
0.2
0.01 to 10
Suppression gain 2
NLANTIVIBGAIN2
0
0 to 99
Suppression gain 3
NLANTIVIBGAIN3
0
0 to 6
Note: Although parameters NLANTIVBHZ, NLANTIVIBSHARP and NLANTIVIBGAIN are still
available, they are not recommended.
1. Set the narrowband center frequency.