Specifications

1 - 10
(a) In the system shown in Fig. 1.4, the position detection unit, command pulse
frequency, and the deviation counter droop pulse amount are determined as
follows:
1) Position detection unit
The position detection unit is determined by the worm gear lead,
deceleration ratio, and the number of pulse generator's slits.
The movement amount per pulse in the QD75 is a position detection unit.
The movement amount, therefore, is given as follows: (Number of output
pulses) x (Position detection unit).
n
=
R
L
A
[mm/pulse]
2) Command pulse frequency
The command pulse frequency is determined by the speed of the moving
part and position detection unit:
A
V
Vs =
[Pulse/s]
3) Deviation counter droop pulse amount.
The deviation counter droop pulse amount is determined by the command
pulse frequency and position loop gain.
K
Vs
=
[Pulse]
(b) The QD75 allows the user to select from the following four units as the unit
used by positioning commands to any of axes (1 to 4, if the module supports
four axes): mm, inch, degree, and pulse.
The unit selected for one axis can be different from the unit selected for
another axis.
When data such as the movement amount per pulse,
acceleration/deceleration time, positioning speed, and positioning address
are correctly set in consideration of the chosen unit, the QD75 can calculate
the number of pulses required for a movement amount to the target
positioning address and execute the positioning by outputting the pulse train
of the calculated number of pulses.