Instruction manual

8. OUTPUT MODULES
8 − 7
8.2 Ball Screws
The operation of ball screws and the parameter settings required to use ball
screws are explained here.
8.2.1 Ball screw operation
This section describes the operation of the ball screw.
(1) Operation
A ball screw outputs a travel value which is the product of the drive module
travel value and the gear ratio of the transmission module.
[Ball screw travel value] =
[transmission module travel
value (PLS)]
× [gear ratio] (Units: PLS)
Gear...
g
ear ratio
Drive module
Clutch
Ball screw
If a clutch is used, the ball screw is controlled from the point at which the clutch
is turned ON.
(2) Control details
(a) The feed current value is maintained on switching from the real mode to the
virtual mode or from the virtual mode to the real mode.
(b) Backlash compensation processing is continued in accordance with the
settings made in the fixed parameters regardless of switches between the
real mode and virtual mode.
(c) The travel value per PULSE is controlled by the ball screw parameters (ball
screw pitch, number of PULSES per ball screw revolution).
Make it the same value as the travel value per PULSE in the fixed
parameters.