
B-65150E/04 4. SERVO FUNCTION DETAILS
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4.17.7 Full Preload Function
(1) Overview
In tandem control, special preload torques of opposite directions, as
shown in Fig. 4.17.7 (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. 4.17.7 (b). This function is referred to as
the full preload function.
However, this function is basically designed to be used together with
the position feedback switch function. So, it is supported by the
following editions in the Series 16. For the Series 15, there is no
limitation on the supporting editions.
16i-MA: B0F1/13 16i-TA: B1F1/12 18i-MA: BDF1/13
18i-TA: BEF1/12
16-MC: B0B1/20 16-TC: B1B1/17 18-MC: BDB1/18
18-TC: BEB1/18
Sub-motor
Input torque
PL (main)
PL (sub)
drive
Fig. 4.17.7 (a) Full preload function
Drive + PL
−PL
PL
− (Drive + PL)
Rack (machine table)
Main side
Sub
Fig. 4.17.7 (b) Relationship between full preloads and backlash (conceptual)