6 Adjustment
118 SD780 Series Servo Technical Manual
Pn402
Torque command
second-order low-
pass filter Q value
0.5
~
1
0.50
1
0x0402
Immediately
Use this parameter to set the Q value of the second-order torque filter. Increasing the
Q value can improve the system responsiveness, but noise will be generated when
the setting is too large.
6.6.2 Gain Switching
The gain switching function includes “manual gain switching” that uses an external input signal and
“automatic gain switching” that automatically switches.
By using the gain switching function, it could increase the gain and shorten the positioning time
during positioning, and it could reduce the gain and suppress the vibration when the motor stops.
Function
code
Parameter
Range
Default Unit
Communication
address
When
enabled
Pn110
Gain switching
mode selection
switch
0x00
~
0x01
0
-
0x0110
Immediately
The gain switching function includes two methods of “manual gain switching” using
an external input signal and “automatic gain switching” that automatically switches.
By using the gain switching function, it could increase the gain and shorten the
positioning time during positioning, and it could reduce the gain and suppress the
vibration when the motor stops.
0-Manual gain switching by external input signal of manual gain switching (G-SEL).
1-When the automatic switching condition is met (Pn111), it automatically switches
from the first gain to the second gain; Otherwise, it switches back to the first gain.
Pn111
Position control
gain automatic
switching
condition
0x00
~
0x05
0
-
0x0111
Immediately
Set the conditions for automatic gain switching:
0-positioning completion signal ON.
1-positioning completion signal OFF.
2-positioning proximity signal ON.
3-positioning proximity signal OFF.
4-position command is 0 after filter and pulse input is OFF.
5-position command pulse input ON.
If the condition is met, it will switch to the second gain, otherwise it switches back to
the first gain.
Pn112
Gain switching
transition time 1
0
~
65535
0
ms
0x0112
Immediately
After waiting for the waiting time from the time when the switching condition has been
met, the first position loop gain is linearly changed to the second position loop gain
during the switching transition time.