
B-65270EN/05 4.SERVO FUNCTION DETAILS
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#7 #6 #5 #4 #3 #2 #1 #0
1960 (FS15i)
PFBCPY
2018 (FS30i, 16i)
PFBCPY (#7) 1: The motor feedback signal for the main axis is shared with the
sub-axis motor.
(Set this parameter for the sub-axis only.)
NC
Main axis feedback
Sub-axis feedback
Linear motor Linear motor
Feedback cable
Magnet
Copy
Fig. 4.18.5 Motor feedback sharing function
4.18.6 Full Preload Function
(1) Overview
In tandem control, special preload torques of opposite directions, as
shown in Fig. 4.18.6 (a), are applied to the main motor and sub-motor
to establish tension in the system.
With these special torques, the rack and pinions can be kept in tension
at all times, as shown in Fig. 4.18.6 (b). This function is referred to as
the full preload function.
However, this function is basically designed to use together with the
position feedback switch function.
Sub-motor
Output torque
Input torque
PL (main)
Main motor
PL (sub)
drive
Fig. 4.18.6 (a) Full preload function
Drive + PL
−PL
PL
− (Drive + PL)
Rack (machine table)
Main side
Sub
Fig. 4.18.6 (b) Relationship between full preloads and backlash (conceptual)