Mitsubishi MELSEC-Q QD77MS - Page 674

13 - 15
Chapter 13 Control Sub Functions
(1) For "Ball screw" + "Reduction gear"
When the ball screw pitch is 10mm, the motor is the HG-KR (4194304
PLS/rev) and the reduction ratio of the reduction gear is 9/44.
M
Machine
Reduction ratio 9/44
First, find how many millimeters the load (machine) will travel (
S
) when
the motor turns one revolution (AP).
•
AP (Number of pulses per rotation) = 4194304 [PLS]
•
S
(Movement amount per rotation)
= Ball screw pitch
×
Reduction ratio
= 10 [mm]
×
9/44
= 10000.0 [
μ
m]
×
9/44
Substitute this for the above expression (1).
At this time, make calculation with the reduction ratio 9/44 remaining as a
fraction.
AP
4194304 [PLS]
S
=
10000.0 [
μ
m]
×
9/44
4194304
×
44
=
10000.0
×
9
184549376
=
90000.0
23068672 23068672 (AP)
=
11250.0
=
11250.0 (AL)
×
1 (AM)
23068672 (AP)
=
1125.0 (AL)
×
10 (AM)
Thus, AP, AL and AM
to be set are as follows.
AP
= 23068672...
Pr.2
AP
= 23068672.
Pr.2
AL
= 11250.0 …
Pr.3
or AL
= 1125.0 …
Pr.3
AM
= 1 …………
Pr.4
AM
= 10 ………
Pr.4
Note): These two examples of settings are only examples. There are
settings other than these examples.