10 Function Code Instructions
220 SD780 Series Servo Technical Manual
When the full closed loop is valid:
The electronic gear ratio is the ratio of the workpiece movement of 1 pulse unit input command by the
host device to the movement of 1 pulse output by the grating ruler.
If the screw is driven, the screw pitch is 10mm and the resolution of the grating ruler is 0.5um.
The number of pulses required by the host system for the motor to rotate 1r is 20000, that is, the pulse
equivalent is 0.5um/pulse, and the movement of the grating ruler is 0.5um, corresponding to outputting
one pulse, then:
Pn208
Internal position
command
0
～
4
0
－
0x0208
After restart
0-Position command select external pulse input.
1-Position command select internal position command.
2-Chasing and shearing electronic cam .
3-Reserved.
4-CANopen mode.
When using CANopen mode, Pn208 must be set to 4 (CANopen mode).
Pn211
Position command
low-pass filter time
constant
0
～
655
0
ms
0x0211
Cease to
take effect
This parameter is used to set the time constant of the first-order low-pass filter corresponding to the
position command and it can reduce the mechanical shock in the case of abrupt changes in the input
pulse command frequency by setting this parameter.
Pn212
Average filter time
in position
instruction rolling
0
～
1000
0
ms
0x0212
Cease to
take effect
This parameter is used to set the time constant of the moving average filter of the corresponding
position instruction. It can reduce the mechanical shock in the case of abrupt changes in the input
pulse command frequency by setting this parameter.
Pn230
Low-frequency
vibration
suppression
selection
0x00
～
0x02
0
－
0x0230
Immediately
This parameter is used with Pn231 as the automatic adjustment mode setting.
0- No vibration suppression.
1- Additional vibration suppression function for specific frequency.
2- Additional vibration suppression to 2 different frequencies.
Pn231
Automatic
adjustment
selection in low-
frequency vibration
suppression
0x00
～
0x01
1
－
0x0231
Immediately
