
B. PARAMETERS
B--65245EN/02
APPENDIXES
204
If the value obtained using this formula is greater than 500, the parameter
should be set to 500. Setting this value causes speed loop gains PK1V and
PK2V to be multiplied by: 1+ LDINT/256
Setting the parameter to a larger value m akes response to speed
commands quicker and servo rigidity higher. If the parameter is set to an
excessively large value, the servo system may vibrate, and noise may
arise, during machine movement. Usually, the parameter should not be set
to more than 500.
If the machine vibrates at a high frequency, the torque command filter
parameter (No.102) can be used to solve this.
101 Acceleration feedback (PK2VAUX)
Size : 2 bytes
This parameter can be used to suppress vibration. If used, it should be set
to a value from --10 t o --20.
102 Torque command filter (FILTER)
Size : 2 bytes
Valid data range : 0 to 2500
Standard setting :0
This parameter can be used to remove the high--frequency noise induced
by a t orque command. If the machine vibrates at a high frequency, the use
of this parameter may suppress the vibration. The following table lists the
relationships between the values specified for the parameter and the
corresponding cut--off frequencies.
Cut --off frequency (Hz) Parameter value
200 1166
150 1596
100 2185
80 2478
The lower the cut--off frequency (the larger the parameter--specified
value), the stronger the filter effect. Specifying a filter with an excessively
strong effect leads to unstable position control.
First, try a 150 Hz filter (set the parameter to 1596). If this does not
suppress high--frequency vibration effectively, increase the parameter
value by about 200 and note the effect. Repeat this until the desired effect
is obtained, but do not exceed 2500.
103 Feed--forward coefficient (FALPH)
Size : 2 bytes
Unit :%
Valid data range : 0 to 100
Standard setting :0
This is a feed--forward coefficient parameter. 100 specified in the
parameter corresponds to a coefficient of 1 (100%).