
4.SERVO FUNCTION DETAILS B-65270EN/05
- 340 -
- Servo block diagram (full preload function)
Position and
velocity control
Position
command
Torque
command
+
−
+
+
Preload (main) > 0
Current
control
Motor
Machine
Position
feedback
switching
Rotor
position
Motor position feedback
+
+
Preload (sub) < 0
Current
control
Rotor
position
Position
feedback
Motor
Sub
Main
Velocity feedback
Motor position feedback
Fig. 4.18.6 (c) Servo block diagram (full preload function)
(2) Parameters for the full preload function
#7 #6 #5 #4 #3 #2 #1 #0
1952 (FS15i)
SPPRLD
2008 (FS30i, 16i)
SPPRLD (#3) 1: Enables the full preload function.
(Set this parameter for the main axis only.)
CAUTION
Always set this bit while the system is in the
emergency stop state. After rewriting this bit,
always turn the power to the NC off, then back on.
#7 #6 #5 #4 #3 #2 #1 #0
1952 (FS15i)
SPPCHG
2008 (FS30i, 16i)
SPPCHG (#4) Specifies the motor output torque polarities:
1: Outputs only the negative polarity to the main axis, and only the
positive polarity to the sub-axis.
0: Outputs only the positive polarity to the main axis, and only the
negative polarity to the sub-axis.
(Set this parameter for the main axis only.)
* A motor torque with a positive polarity is a torque that is
produced counter clockwise as viewed from the shaft.
See Fig. 4.18.6 (d).