
3. αiS/αiF/βiS SERIES PARAMETER ADJUSTMENT B-65270EN/05
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(3) Initialization of parameters related to high-speed and high-precision
machining
The parameter values to be set first before servo adjustments are made
are listed below. Sufficient performance can be obtained just by
setting these values. Furthermore, by separately adjusting the settings
indicated by gray shading, much higher speed and higher precision
can be obtained.
[Fundamental Parameters]
Parameter No.
FS15i FS30i, 16i, and so on
Standard setting value Description
1809 2004 0X000011
(Note 1)
Enables HRV2 control
1852 2040 Standard parameter
(Note 1)
Current integral gain
1853 2041 Standard parameter
(Note 1)
Current proportional gain
1808 #3 2003 #3 1
(Note 1)
Enables PI function
1959 #7 2017 #7 1
(Note 1)
Enables velocity loop high cycle management function
1884 #4 2006 #4 1 Enables 1-ms velocity feedback acquisition
1958 #3 2016 #3 1 Enables variable proportional gain in the stop state
1730 2119
2 (detection unit of 1 µm)
20 (detection unit of 0.1µm)
For variable proportional gain function in the stop state :
judgment level for stop state
(specified in detection units)
1825 1825 5000 Position gain
1875 2021 128 Load Inertia ratio (Velocity Loop Gain)
(Note 4)
1742 #1 2202 #1 1 Cutting/rapid traverse velocity loop gain variable
1700 2107 150 Velocity loop gain override at cutting traverse
NOTE
1 Optimum parameters can be loaded automatically by setting a motor ID number for
servo HRV2 control.
If there is no motor ID number for servo HRV2 control, load the standard
parameters for servo HRV1, then calculate parameter values as follows:
No. 2004 = 0X000011 (Keep X unchanged.)
No. 2040 = Standard parameter for HRV1 × 0.8
No. 2041 = Standard parameter for HRV1 × 1.6
2 To use I-P function, set 0.
PI function and I-P function have the following features:
PI function: Provides good follow-up to a target command. This function is required
for high-speed and high-precision machining.
I-P function: Requires a relatively short time to attain a target position. This function
is suitable for positioning applications.
3 With some machines, a higher velocity loop gain can be set by using neither the
acceleration feedback function nor auxiliary function rather than by using these
functions. If it is impossible to set a high velocity loop gain (about 300%) when the
velocity loop high cycle management function is used, try to use the acceleration
feedback function (See Subsection 4.4.2), and use the function that allows a higher
velocity loop gain to be set.
4 There is the following relationship between the load inertia ratio and velocity loop
gain (%).
Velocity loop gain (%) = (1 + load inertia ratio / 256) × 100